NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (2022)

NCERT Solutions Class 9 Science Chapter 7 Diversity in Living Organisms – Here are all the NCERT solutions for Class 9 Science Chapter 7. This solution contains questions, answers, images, step by step explanations of the complete Chapter 7 titled Diversity in Living Organisms of Science taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 7 Diversity in Living Organisms. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms in one place. For a better understanding of this chapter, you should also see Chapter 7 Diversity in Living Organisms Class 9 notes , Science.

Topics and Sub Topics in Class 9 ScienceChapter 7 Diversity in Living Organisms:

  1. Diversity in Living Organisms
  2. What is the Basis of Classification?
  3. Classification and Evolution
  4. The Hierarchy of Classification- Groups
  5. Plantae
  6. Animalia
  7. Nomenclature

These solutions are part of NCERT Solutions for Class 9 Science. Here we have given Class 9 NCERT Science Textbook Solutions for Chapter 7 Diversity in Living Organisms.

In-Text Questions Solved

NCERT Textbook for Class 9 Science – Page 80
Question 1. Why do we classify organisms?
Answer:For easier and convenient study we classify organisms.

Question 2. Give three examples of the range of variations that you see in life-forms around you.
(a) Small cat and big cow
(b) Grass and banyan tree
(c) Black crow and green parrot

More Resources for CBSE Class 9

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  • RD Sharma Class 9 Solutions

CBSE Class 9 Science NCERT Textbook – Page 82
Question 1. Which do you think is a more- basic characteristic for classifying organisms?
(a) the place where they live.
(b) the kind of cells they are made of. Why?
Answer:Classification based on living place is more basic as there can be wide variations in organisms living in a given place.

Question 2. What is the primary characteristic on which the first division of organisms is made?
Answer:Nature of cell is the primary characteristics on which the first division of organisms is decided. Based on this criterion life forms can be classified into prokaryotes or eukaryotes.

Formulae Handbook for Class 9 Maths and ScienceEducational Loans in India

Question 3. On what bases are plants and animal’ out into different categories?
Answer:Mode of nutrition and presence or absence of cell walls.

CBSE Class 9 Science NCERT Textbook – Page 83
Question 1. Which organisms are called primitive and how are they different from the so-called – advanced organisms?
Answer:Organisms with simple cellular structure and no division of labour are called
Advanced organisms, like mammals have millions of cells and there are different organs and organ system for different biological functions.

Question 2. Will adiKznced organisms be the same as complex organisms? Why? t
Answer:Yes, advanced organisms means greater degree of evolution which leads to more complexity.

CBSE Class 9 Science Ncert textbook Page 85
Question 1. Whaf is the criterion for classification of organisms as belonging to kingdom Monera or Protista?
Answer:It is the presence or absence of a well defined nucleus. Monera has no nuclear membrane, while Protista shows well defined nucleus.

Question 2. In which kingdom will you place an organism which is single-celled, eukaryotic and

Question 3. In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms?
Answer:Organisms belonging to Kingdom Monera will have the small number of organisms with a maximum of characteristics in common. And kingdom Animalia will have the largest number of organisms.

NCERT Textbook for Class 9 Science – Page 88
Question 1. Which division among plants has the simplest organisms?
Answer:Thallophyta or algae.

Question 2. How are pteridophytes different from the phanerogams?
Answer:Pteridophytes have naked embryo and inconspicuous reproductive organ whereas — phanerogams have well-differentiated reproductive organs and covered embryo.

Question 3. How do gymnosperms and angiosperms differ from each other?
Answer:Seeds are naked in Gymnosperms and are covered in angiosperms.


NCERT Textbook for Class 9 Science – Page 94
Question 1. How do poriferan animals differ from coelenterate animals?

  • Animals from Porifera show cellular level of organisation, while those from Coelenterata show tissue level of organisation.
  • In Porifera there is no division of labour, while in Coelenterata some division of labour is seen.
  • Porifera do not have coelom, while coelenterata have coelom.

Question 2. How do annelid animals differ from arthropods?
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (1)

Question 3. What are the differences between amphibians and reptiles?
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (2)

Question 4. What are the differences between animals belonging to the Aves group and those in the mammalia group?
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (3)

Extra Questions for CBSE Class 9 Science (Biology) Diversity in Living Organisms

Question 1. What are the advantages of classifying organisms?
Answer: Advantages of classification:

  • Better categorization of living beings based on common characters.
  • Easier study for scientific research.
  • Better understanding of human’s relation and dependency on other organisms.
  • Helps in cross breeding and genetic engineering for commercial purposes.

Question 2. How would you choose between two characteristics to be used for developing a hierarchy in classification?
Answer:Gross Character will “form-the basis of start of the hierarchy and fine character -will -form “the basis of further steps of single the hierarchy.

  1. Presence of vertebral column in human beings can be taken under vertebrata.
  2. Presence of four limbs makes them members of Tetrapoda.
  3. Presence of mammary glands keeps them under mammalia.

Question 3. Explain the basis for grouping organisms into five kingdoms.
Answer:Basis Of Clasiffication:
(a) Number of cells
(b) Layer of cells
(c) Presence or absence of cell wall
(d) Mode of nutrition
(e) Level Of organization

Question 4. What are the major divisions in the Plantae? What is the basis for these divisions?
Answer:Major Divisions of Kingdom plantea:

DivisionBasis of Classification
Thallophyta or AlgaeThallus like body
BryophytaBody is divided into leaf and stem
PteridophytaBody is divided into root, stem and leaf
GymnospermSeed bearing, naked seeds
AngiospermSeed bearings covered seeds

Question 5. How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
Answer:In plants body basic structure is a major criteria based on which Thallophytes are different from Bryophytes. Apart from this absence or presence of seeds is another important criteria. Gymnosperms and angiosperms are further segregated based on if seeds are covered or not. It is clear that it is the morphological character which makes the basis for classification of plants.
In animals classification is based on more minute structural variations. So in place of morphology, cytology forms the basis. Animals are classified based on layers of cells, presence or absence of coelom. Further higher the hierarchy animals are classified based on presence or absence of smaller features, like presence or absence of four legs.

Question 6. Explain how animals in Vertebrata are classified into further subgroups.
Answer:Vertebrata is divided into two superclasses, viz. Pisces and Tetrapoda. Animals of Pisces have streamlined body with fins and tails to assist in swimming. Animals of Tetrapoda have four limbs for locomotion.
Tetrapoda is further classified into following classes:
(a) Amphibia: Are adapted to live in water and on land. Can breathe oxygen through skin when under water.
(b) Reptilia: These sire crawling animals. Skin is hard to withstand extreme temperatures.
(c) Aves: Forelimbs are modified into wings to assist in flying. Beaks are present. Body is covered with feathers.
(d) Mammalia: Mammary glands present to nurture young ones. Skin is covered with hair. Most of the animals are viviparous.

NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (Hindi Medium)

NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (4)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (5)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (6)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (7)
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NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (9)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (10)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (11)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (12)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (13)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (14)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (15)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (16)
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (17)

More Questions Solved

NCERT Solutions for Class 9 Science Chapter 7 Very Short Answer Questions

Question 1. Who wrote the book “The Origin of Species”?
Answer:Charles Darwin in 1859.

Question 2. Who proposed the classification of organisms into 5 kingdom?
Answer:Robert Whittaker (1959).

Question 3. Define species.
Answer:All organisms that <are similar to breed and perpetuate.

Question 4. Give example of the organism belonging to Monera and Protista Kingdom.
Answer:Monera—Anabaena, blue-gr^en algae Protista—Eugleno, Paramecium, Amoeba

Question 5. Name the appendages used for movement by organism belonging to Protista kingdom
Paramecium – Cilia
Euglena – Flagella
Amoeba – Pseudopodia

Question 6. What is lichen?
Answer:The symbiotic association of fungi and blue-green algae, is called lichen.

Question 7. What is symbiotic relationship?
Answer:It is a relationship between two organisms in which both of them are benefitted, e.g., fungi gets food from blue-green algae and in return blue-green gets shelter [lichens].

(Video) Diversity in Living Organisms Full Chapter Class 9 Biology | CBSE Class 9 Biology

Question 8. What is saprophytic nutrition?
Answer:The organisms using dead and decaying organic matter as food are said to show saprophytic nutrition.

Question 9. Give simple dassificatian of plant kingdom.
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (18)

Question 10. Name the plant amphibian.
Answer:Biyophyta e.g. Funaria (Moss).

Question 11. What are cryptogamae?
Answer:The plants with inconspicuous reproductive organs are called cryptogamae, e.g., fern.

Question 12. Give examples of pteridophyte.
Answer:Marsilea and Fern.

Question 13. Name the reproductive organ of plants.

Question 14. What are gymnosperms?
Answer:The group of plants that bear naked seeds e.g., pines, deodar.

Question 15. What are angiosperms?
Answer:The group of plants with covered seeds are called angiosperms. These are flowering plants.

Question 16. What are cotyledons?
Answer:Plant embryos in seeds have structures called cotyledons. Cotyledens are also known as seed leaves.

Question 17. Name the phylum of an animals with pores on it.
Answer:Porifera e.g., sponge.

Question 18. Name the phylum of Jellyfish
Answer:Coelenterata or Cnidaria.

Question 19. What is the meaning of triploblastic?
Answer:Animals which have three layers of cells from which differentiated tissues -can be made.

Question 20. What is bilateral symmetry?
Answer:When the left and right halves of the body have same design it is called bilateral symmetry.

Question 21. What is the meaning of “cold-blooded animal”?
Answer:Those animals who show the variation in their body temperature according to the surroundings are called cold-blooded animals, e.g., fish, amphibians, reptiles.

Question 22. Name two mammals that lay eggs.
Answer:Platypus and echidna.

Question 23. Name three mammals that live in water.
Answer:Whale, platypus and Dolphins.

Question 24. Name a fish with skeleton made up of cartilage.

Question 25. Name two fish which have skeleton made up of both bone and cartilage.
Answer:Tuna and rohu.

Question 26. Name the reptile with four-chambered heart.

(Video) Class9th Science chapter 7 Diversity in living organisms exercise solutions

NCERT Solutions for Class 9 Science Chapter 7 Short Answer Type Questions

Question 1. Give the characteristics of Monera.
(a) Organisms are unicellular, do not have a defined nucleus.
(b) Organisms may have a cell wall or may not have cell wall.
(c) Mode of nutrition is either autotrophic or heterotrophic.

Question 2. Give the characteristics of Protista.
(a) Organsims are unicellular and eukaryotic.
(b) Use appendages for locomotion like cilia, flagella, etc.
(c) Nutrition is either autotrophic or heterotrophic.
(d) E.g., algae, protozoa.

Question 3. Give the difference between thallophyta and bryophyta.

Body is thallus like not differentiated into -root, stem. Example: Spirogyra.Plant Body is differentiated into stem and leaf like structures. Example: Moss.

Question 4. What are hermaphrodites? Give two examples.
Answer:When an organism has both the sexes, i.e., it can produce both sperms and eggs are called hermaphrodites. Example: Sponges, earthworms.

Question 5. Give the difference between monocots and dicots.

1. Seeds with one cotyledon.

2. Leaves have parallel venation.

3. Root system—fibrous.

Seeds with two cotyledons.

Leaves have reticulate venation.

Root system—tap root.

Question 6. Give the difference between two types of symmetry that animals show.
Answer:Symmetry—Bilateral and Radial

Bilateral SymmetryRadial Symmetry
Any organism that has same design on left and right halves of the body. Example: Earthworm, spider, cockroach.Any organisms with a body design such that it can be divided into two equal halves from any radius. Example: Starfish sea urchin.

Question 7. Differentiate between vertebrates and invertebrates.

1. Notochord is present.

2. True internal skeleton present.

Notochord is absent.

No true internal skeleton present.

Question 8. Name the phylum of the following animals:
(a) Tapeworm (b) Starfish
(c) Jellyfish (d) Octopus
(a) Tapeworm – Flatyhelminthes
(b) Starfish – Echinodermatai
(c) Jellyfish – Coelenterata
(d) Octopus – Mollusca

Question 9. Identify the phylum for the following characteristics given:
(a) Organisms with joint appendages.
(b) Organisms are generally flat worms.
(c) Body is segmented.
(d) Skin of organisms is full of spikes.
(a) Arthropoda
(b) Platyhelminthes
(c) Ann elida
(d) Echinodermata

Question 10. State the features of all chordates.
Answer:All chrodates possess the following features:

  1. Have a notochord
  2. Have a dorsal nerve chord
  3. Are triploblastic
  4. Have paired gill pouches

Question 11. Give general characteristics of Porifera.
(a) Animals with pores all over the body.
(b) Body is not well differentiated.
(c) Non-motile animals, remain attached to solid support.
(d) Body is covered with hard outer skeleton. Example, sponges.

Question 12. How are pores or holes all over the body of Porifera important?
Answer:The pores or holes present all over the body of the organisms lead to a canal system that helps in circulating water throughout the body to bring in food and oxygen.

Question 13. Give general characteristics of ‘Platyhelminthes’?
(a) These are flat worms.
(b) Most of them are parasites.
(c) Animals are triploblastic
(d) No true internal body cavity.
E.g., Tapeworm, planaria, Liver fluke.

Question 14. Give specific characteristics of Coelenterata.
(a) Water living animals.
(b) Body is made of two layers of cells.
(c) Some of them live in colonies (corals), while others have solitary life-span {Hydra).
(d) Body cavity present.

Question 15. Give the characteristics of Arthropoda with 2 examples.
(a) Arthropoda means jointed legs’.
(b) Animals are bilaterally symmetrical and segmented.
(c) It has an open circulatory system.
(d) This is the largest group of animals.
Example: Spider, scorpionts, crabs, house flies.

Question 16. Give the characteristic features of Echinodermata.
(a) Spikes present on skin.
(b) Free living, marine animals.
(c) Triploblastic and have a coelomic cavity.
(d) Have a peculiar water driven tube system used for moving around.
(e) Have hard calcium carbonate structure that is used as a skeleton.
Example, Starfish, seaurchin.

Question 17. Give the characteristics of mammals.
(a) Mammals are warm-blooded animals.
(b) Four-chambered heart.
(c) Mammary glands for production of milk to nourish their younger one.
(d) Skin has hairs, sweat glands and oil glands.
(e) Most of them produce their young ones (viviparous).

Question 18. What are the conventions followed for writing the scientific names?
Answer:The conventions followed while writing the scientific names are:
1. The name of the genus begins with a capital letter.
2. The name of the species begins with a small letter.
3. When printed, the scientific name is given in italics.
4. When written by hand, the genus name and the species name have to be underlined separately.

(Video) Class 9 Science Chapter 7 Diversity In Living Organisms

Question 19. Differentiate between algae and fungi

1. Contain chlorophyll (green in colour).

2. Autotrophic nutrition.

3. Food is stored in the form of starch.

1. Do not contain chlorophyll (non-green)

2. Heterotrophic nutrition.

3. Food is stored in the form of glycogen.

Question 20. Name the phylum of the following organisms, whose exclusive characteristics is given below:
(a) Hollow bones (b) Jointed appendages
(c) Flat worm (d) Round worms, parasitic
(e) Soft body, muscular marine animal (f) Radially symmetrical, spiny skin.
(a) Phylum chordata, subphylum—vertebrata, class—Aves
(b) Phylum—Arthropoda
(c) Phylum—Platyhelmithes
(d) Phylum—Aschelminthes
(e) Phylum—Mollusca
(f) Phylum—Echinodermata

Question 21. Give the characteristibs of amphibians.
Answer:Amphibians are vertebrates that lives on land and in water.
(a) They are cold-blooded.
(b) Heart is three-chambered.
(c) Fertilization is external.
(d) Respiration through lungs on land and through moist skin when in water. Example, Frog, Toads

Question 22. Give the characteristics of Aves.
(a) Aves/birds can fly.
(b) Streamlined body.
(c) Hollow and light bones.
(d) Forelimbs are modified into wings.
(e) Warm-blooded animals, heart with four chambers.
(f) Egg laying animals.
(g) Beak present, teeth are absent.

Question 23. Why do most of the amphibians lay their eggs in water and reptiles lay their eggs on land?
Answer:Amphibians lay their eggs in water because the tadpeles or young, ones that hatch out of egg has gills at initial stages, that allows them; to breathe in water.
In case of reptiles the young ones that hatch out does not have gplls> and the hatching of eggs requires warmth that is given by the mother, reptile.

Question 24. Give the hierarchy of 5 kingdom classification of living world.
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (19)

NCERT Solutions for Class 9 Science Chapter 7 Long Answer Type Questions

Question 1. What is the importance of classification?
Answer:Classification is important because:
(a) Classification makes the study of wide variety, of organisms, systematic and easier.
(b) It projects a picture of all organisms and their interrelation with each other.
(c) It provides a base for the study of other branches of biology.
(d) It is useful in the study of ecology, which deals with; the inter-relation of an organism with their environment.
(e) It helps to establish a hierarchy of groups of organisms.

Question 2. What are the characteristic features of mammals?
Answer:Characteristics features of mammals: –
(a) Body is covered with hair.
(b) Skin is provided with sweat and sebaceous glands.
(c) Heart is four-chambered.
(d) Fertilization is internal.
(e) Females have mammary glands to produce milk to nourish their young ones.
(f) External ear—pinna, present.
(g) Eyes have eye lids.
(h) Warm-blooded.
(i) Respiration through lungs,
(j) Body cavity divided’ into- thorax and1 abdomen by muscular diaphragm.

Question 3. What are the characteristic features of reptiles?
Answer:The characteristics of reptiles:
(a) Dry scaly, impermeable skin.
(b) Respiration through lungs.
(e) Cold-blooded
(d) Internal fertilization.
(e) Heart is three chambered’.
(f) Two pairs of pentadactyl limbs are present.

Question 4. What are the basis for classification of organisms?
Answer:The basis for classification are:
(a) Presence or absence of nucleus.
(b) Organisms are unicellular, or multicellular.
(c) Level of organisation.
(d) Autotrophic mode of nutrition or heterotrophic mode of nutrition.
(e) Of the organisms that perform photosynthesis (Plants), their level, or organisation of the body.
(f) Of the animals, how does the individuals body develop and organise its different parts.

Question 5. Give the characteristics of fiat worms, round worms and segmented worm. Give their phylum.
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (20)

Flat wormsRound wormsSegmented worms
Phylum—PlatyhelminthesPhylum NematodaPhylum Annelida
Dorsoventrally flat, i.e., flat body from top to bottom.Body is cylindrical.Body is segmented from head to tail.
No true body cavity.Pseudocoelom (Sort of body (cavity).True body cavity.
Mostly hermaphrodite, i.e., male and female sex organs present in the same individual.Sexes are separate.May be unisexual or bisexual.

Question 6. Give the classification of the plant kingdom.
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (21)

Question 7. Differentiate (5 points) between monocot and dicot plants.

Monocot PlantsDicot Plants
1. Fibrous root

2. Parallel venation

3. Seeds with one cotyledon

4. Vascular bundles are scattered.

5. Flowers are trimerous


Reticulate venation.

Seeds with two cotyledons

Vascular bundles are arranged in rings.

Flowers are pentamerous, flowers or tetramerous

Question.8. Give the outline classification of animal kingdom.
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms (22)

NCERT Solutions for Class 9 Science Chapter 7 Activity -Based Questions

Question 1.

  1. We have heard of ‘desi’ cows and Jersey cows.
  2. Does a desi cow look like a Jersey cow?
  3. Do all desi cows look alike.
  4. Will we be able to identify a Jersey cow in a crowd of desi cows that don’t look like each other?
  5. What is the basis of our identification?


  1. Desr cow is different in size’ and colour.
  2. Most of the desi cows look alike, not all.
  3. Yes, Jersey cow can be spotted’ from the group.
  4. Basis of identification:
  5. Size, horn shape, skin colour, height, etc.

Question 2.

  • Soak seeds of green gram, wheat, maize, peas and tamarind Once they become tender, try to split the seed. Do all the seeds break into two nearly equal halves?
  • The seeds that do are the dicot seeds and the seeds that don’t are then; monocot seeds.
  • Now take a look at the roots, leaves and flowers of these plants.
  • Are the roots, tap roots or fibrous?
  • Do the leaves have parallel or reticulate venation?
  • How many petals are found in the flowers of these plants?
  • Can you write down further characteristics of monocots and dicots on the basis of these observations?


CharacteristicsGreen gramWheatMaizePeasTamarind
1. RootsTap rootFibrous rootFibrous rootTap rootTap root
2. CotyledonDicotyledon.MonocotyledonMonocotyledonDicotyledon.Dicotyledon.
3. Venation in leavesReticulateParallelParallelReticulateReticulate
4. Vascular bundleIn a ringNot in a ringNot in a ringIn a ringIn a ring
5. FlowersPentamerousTrimerousTrimerousPentamerousPentamerous

Question 3. Find out the. names of the following, animals and plants in as many: languages as you can.
Answer:It is difficult to remember names of a species in different languages This problem means there was a need for some system to create unifhrm naming convention: Hence system of nomenclature and classification was devised

(Video) Diversity in Living Organisms L1 | CBSE Class 9 Science (Biology) Chapter 7 | NCERT Solutions (2019)

1. Frog—Rana tigrina

2. Human—Homo Sapiens

3. Peacock—Pam cristatus

4. Honeybee—Apis cerena, Apis indica.

1. Touch me not—Mimosa pudica.

2. Neem—Azadirachta indica.

3. Maize—Zea mays.

NCERT Solutions for Class 9 Science Chapter 7 Value-Based Questions

Question 1. Many medicinal plants every year are getting extinct. A group of students who had gone for educational trip clicked photographs of endangered plants. These photograph were used by the school laboratory to study these plants.
(a) Name two endangered plants.
(b) Name any one medicinal plant and give its medicinal use.
(c) What value of students is reflected in the above act?
(a) Two endangered plants are:
(i) Euphrasia
(ii) Ubnus rubra
(b) Aloe-vera. Juice of Aloe-vera is used in case of indigestion, treating dkin infection etc.
(c) Students are caring citizens, shows responsible behaviour.

Question 2. Due to global warming coral is getting diminished in all the oceans/ water bodies. People in Lakshadweep island protects their corals by not allowing people/tourist to scape take few pieces away.
(a) Name the phylum of coral.
(b) What is coral made up of.
(c) What values of people in Lakshadweep island is reflected?
(a) Phylum of coral is coelenterata.
(b) Coral is made up of calcium carbonate.
(c) People in Lakshadweep island reflect the value of-being-responsible (Citizen, respecting environment and nature.


Why do we classify organisms Chapter 7 Class 9? ›

Why do we classify organisms? Answer: For easier and convenient study we classify organisms. Question 2. Give three examples of the range of variations that you see in life-forms around you.

What is diversity in living organisms Class 9? ›

Our planet is gifted with numerous living organisms, which vary in their size, shape, habitat, nutrition, reproduction and a lot more. Based on their physical features and their habitat, these animals of Kingdom Animale are classified into different order and class.

Why do we classify organisms for Class 9 short answer? ›

In order to identify organisms and comprehend the diversity of living things, the classification of organisms is important. Learning about several diverse plants and animals, as well as their traits and commonalities, is made easier by classifications.

How do we fall ill Class 9? ›

The air carries bacteria, virus and the diseases that can be caused are: common cold, influenza, tuberculosis etc. (b) Through food and water: When one eats/drinks contaminated food/water, that contains bacteria, virus, worm etc. it can cause diseases like cholera typhoid, hepatitis.

Which organisms are called primitive? ›

A primitive organism has a relatively simpler body design and structure. The body design of these organisms have not changed since their evolution. A typical example of primitive organism is an Amoeba. Advanced organisms, on the other hand, have complex body design and an advanced structural organization.

Why do we fall ill? ›

We might fall ill due to the reason we live in polluted surroundings or lack of personal hygiene. It is so necessary to adopt certain strategies to stay healthy and prevent diseases on our own. One should remain active by taking daily exercises. Eating healthy food helps in the prevention of diseases.

Which chapters are deleted in science class 9? ›

Class 9 Science Deleted Syllabus 2021-22: Practicals

Determination of the melting point of ice and the boiling point of water. Verification of the Laws of reflection of sound. Determination of the speed of a pulse propagated through a stretched string/slinky (helical spring).

What are the 4 types of diversity in biology? ›

Thus, the four main levels of biodiversity are species, genetic, ecosystem, and global biodiversity.

What is diversity very short answer? ›

Diversity means having a range of people with various racial, ethnic, socioeconomic, and cultural backgrounds and various lifestyles, experience, and interests.

How is taxon defined? ›

A taxon is generally referred to as a group of organisms classified as a unit. The taxa at different hierarchical levels are species, genus, order, family, phylum, and kingdom.

Which is the basic unit of classification? ›

Species constitute a group of phenotypically similar organisms with common ancestry that can interbreed freely to produce fertile progeny and hence, is considered the basic unit of classification.

Why are viruses not considered as living thing? ›

Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.

What does disease look like? ›

Note: Disease can be viewed by examining symptoms of disease. The common symptoms of diseases include headache, fever, vomiting etc. Like jaundice can be examined by pale skin. Diarrhoea can be examined by loose motions.

Why do we fall ill very short? ›

Answer: In poorly ventilated and overcrowded areas, the little droplets containing air-borne microbes thrown by an infected person on coughing or sneezing, can be easily inhaled by a healthy person standing close by. This can start a new infection in the healthy person.

What is vaccination Class 9? ›

Vaccination is the injection of a dead or weakened organism that forms immunity against that organism in the body. Immunization is the process by which an animal or a person stays protected from diseases.

What is organism called? ›

An organism refers to a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis. An organism would, therefore, be any animal, plant, fungus, protist, bacterium, or archaeon on earth. These organisms may be classified in various ways.

What is the most primitive animal? ›

Research in Trichoplax adhaerens of the phylum Placozoa, which is the most ancient and primitive animal still living today, does provide information on the evolution and functioning of these processes.

Why is bacteria called primitive cell? ›

Bacteria are said to be the best-known prokaryotic organisms. Prokaryotic cells are said to be primitive because they lack a membrane-bound nucleus and other membrane-bound cell organelles. The word prokaryotic means “primitive nucleus.”

What is difference between health and disease? ›

Hint: Health is defined as an individual's mental, physical, and psychological well-being. The disease is defined as the abnormal dysfunctioning of the mental-physical states, which results in illness in a specific individual and does not take into account society or community.

What is difference between disease free and healthy? ›

What is the difference between being disease free and healthy?
1. It relies upon the individual as well as on the environmental and social elements.1. It relies upon the individual only.
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Why do we fall ill when we eat food which is not fresh? ›

When germs that cause food poisoning get into our systems, they can release toxins. These toxins are poisons (the reason for the name "food poisoning"), and can cause diarrhea and vomiting. Usually, doctors use "food poisoning" to describe an illness that comes on quickly after eating contaminated food.

Is class 9 science hard? ›

In Class 9, Science can be a challenging subject to learn. Students will have to understand the concepts of physics, chemistry, and biology in depth so that the foundations they have to move onto more complex topics in the future are strong enough.

Is science class 9 tough? ›

Science is divided into three branches – Biology, Chemistry and Physics. This is why sometimes the students consider science as one of the hardest subjects in Class 9th.

Will Ncert books change in 2022 for class 9? ›

National Council of Educational Research & Training, NCERT has decided to lighten school textbooks of all classes for the academic session 2022-23.

What are the two main types of diversity? ›

While defining diversity can be difficult, it may be helpful to understand two different types of diversity: Acquired and inherent.

What is the largest type biodiversity? ›

Ecological biodiversity

This is the largest scale of biodiversity, because it compares the diversity across different ecosystems. For example, the distribution of life forms within a desert will be very different from those in a mangrove.

What are the three types of diversity? ›

Affinity bonds us to people with whom we share some of our likes and dislikes, building emotional communities. Experiential diversity influences we might call identities of growth. Cognitive diversity makes us look for other minds to complement our thinking: what we might call identities of aspiration.

What are the 3 types of diversity Name & explain them? ›

Here's a breakdown of these forms of diversity:
  • Cultural diversity. This type of diversity is related to each person's ethnicity and it's usually the set of norms we get from the society we were raised in or our family's values. ...
  • Race diversity. ...
  • Religious diversity. ...
  • Age diversity. ...
  • Sex / Gender / Sexual orientation. ...
  • Disability.

Why is India called a country with diversity? ›

India is called the 'land of diversity' because we have various types of food, speak different languages, celebrate different festivals, and practise different religions and traditions.

Are humans a taxon? ›

Human taxonomy is the classification of the human species (systematic name Homo sapiens, Latin: "wise man") within zoological taxonomy.
Human taxonomy.
Homo ("humans") Temporal range: Piacenzian-Present,
Scientific classification
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Who discovered taxon? ›

Today is the 290th anniversary of the birth of Carolus Linnaeus, the Swedish botanical taxonomist who was the first person to formulate and adhere to a uniform system for defining and naming the world's plants and animals.

Who invented the taxon? ›

The term taxon was first used in 1926 by Adolf Meyer-Abich for animal groups, as a back-formation from the word taxonomy; the word taxonomy had been coined a century before from the Greek components τάξις (taxis, meaning arrangement) and -νομία (-nomia meaning method).

What is the smallest unit of classification? ›

Kingdom, division or phylum, class, order, family, genus, and species are the seven major obligatory groupings included in the hierarchy. In this hierarchical classification, species is the smallest unit and kingdom is the largest.

What is the biggest unit of classification? ›

The hierarchy of classification is Species, Genus , Family , Order , Class , Phylum/Division , Kingdom. Kingdom being the largest unit of classification and it has the largest number of organisms.

Which group has the largest number of species? ›

The kingdom is the taxon that contains the largest number of species. It is the broadest division in which the organisms are grouped in taxonomy. R.H Whittaker gave the five-kingdom classification. This classification includes kingdoms Monera, Protista, Fungi, Plantae, and Animalia.

Do viruses have DNA? ›

Unlike cells (e.g. bacteria, plant and animal cells), viruses contain either DNA or RNA, never both; the viral nucleic acid is either single or double stranded. Viruses with a DNA core are capable of surviving in the nucleus of the cell they infect, using the host's biochemical machinery to replicate their DNA.

Do viruses have brains? ›

It is about microorganisms (or short microbes) like viruses, bacteria and conglomerates of these simple life forms and their surprising ability to learn, adapt, survive and to behave intelligently even though they have no brains and not even nerve cells.

Do viruses use energy? ›

Living things use energy.

Outside of a host cell, viruses do not use any energy. They only become active when they come into contact with a host cell. Once activated, they use the host cell's energy and tools to make more viruses. Because they do not use their own energy, some scientists do not consider them alive.

What are the 3 types of disease? ›

There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic diseases and non-genetic hereditary diseases), and physiological diseases.

What causes viral infection? ›

Tosh, M.D. As you might think, bacterial infections are caused by bacteria, and viral infections are caused by viruses. Perhaps the most important distinction between bacteria and viruses is that antibiotic drugs usually kill bacteria, but they aren't effective against viruses.

What are the 4 types of infections? ›

Infections are common. From ear infections and the flu to COVID-19, chances are we all have had at least one at some point. Viral, bacterial, fungal, and parasitic infections can all trigger sepsis.

Which type of infectious disease is malaria What causes malaria and how can it be prevented? ›

Key facts. Malaria is a life-threatening disease caused by parasites that are transmitted to people through the bites of infected female Anopheles mosquitoes. It is preventable and curable. In 2020, there were an estimated 241 million cases of malaria worldwide.

What do you mean by health? ›

Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.

Who created the first vaccine? ›

Dr Edward Jenner created the world's first successful vaccine. He found out that people infected with cowpox were immune to smallpox. In May 1796, English physician Edward Jenner expands on this discovery and inoculates 8-year-old James Phipps with matter collected from a cowpox sore on the hand of a milkmaid.

What are the 5 types of vaccines? ›

There are several types of vaccines, including:
  • Inactivated vaccines.
  • Live-attenuated vaccines.
  • Messenger RNA (mRNA) vaccines.
  • Subunit, recombinant, polysaccharide, and conjugate vaccines.
  • Toxoid vaccines.
  • Viral vector vaccines.
29 Apr 2021

When was the first vaccine? ›

Edward Jenner is considered the founder of vaccinology in the West in 1796, after he inoculated a 13 year-old-boy with vaccinia virus (cowpox), and demonstrated immunity to smallpox. In 1798, the first smallpox vaccine was developed.

Why do we classify organisms organisms? ›

Living organisms are classified mainly to avoid confusion, to make study of organisms easy and learn how various organisms are related to each other. Scientists classified living organisms into different kingdoms, phylum, class, etc and are based on different criteria.

What is the reason to classify organisms? ›

Scientists classify living things to organize and make sense of the incredible diversity of life. Classification also helps us understand how living things are related to each other. All life can be sorted into three large groups called domains.

Do we classify organisms Class 9? ›

Answer: The method of arranging organisms into groups or sets on the basis of similarities and differences is called classification. The need to classify organisms arises because there are innumerable diverse species on this planet Earth ranging from a small microorganism (bacteria) to a large elephant.

Why is it important to classify the organism? ›

Organisms are usually grouped together based on their unique characteristics. The classification of an organism often provides useful information about its evolutionary history and which other organisms are related to it.

What are the two main groups of living organisms? ›

Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.

What is the scientific name of organism? ›

The scientific name pertains to the binomial name given to a particular species. It is based on the system of binomial nomenclature used by a taxonomist when naming an organism at the species level. It is comprised of two parts: (1) the generic name or the genus name and (2) the species name or the specific epithet.

What are 3 benefits of classification? ›

It facilitates the identification of organisms. It explains how different creatures interact with one another. It aids in the comprehension of organism evolution. It helps to understand how animals, plants, and other living creatures are related and how they can benefit humans.

What are 4 ways to classify organisms? ›

There are four main characteristics that scientists use to classify organisms: 1) number of cells – unicellular or multicellular; 2) presence of nucleus – prokaryote or eukaryote; 3) how energy is obtained – autotroph or heterotroph; 4) mode of reproduction – sexual or asexual.

What are the 3 ways to classify an organism? ›

Most scientists think that all living things can be classified in three domains: Archaea, Bacteria, and Eukarya.

What are the five major groups of microbes? ›

Microbial diversity is truly staggering, yet all these microbes can be grouped into five major types: Viruses, Bacteria, Archaea, Fungi, and Protists.

What do you mean by taxon? ›

A taxon is defined as a collection of one or more populations of organisms. Taxa are the hierarchical divisions of a species from Kingdom to subspecies. Some taxonomic groupings are uniformly classified in the plant, protist, and animal categorization.

Do humans classify animals? ›

Humans can move on their own and are placed in the animal kingdom. Further, humans belong to the animal phylum known as chordates because we have a backbone. The human animal has hair and milk glands, so we are placed in the class of mammals.

Which two organisms are most closely related? ›

Amoeba and Euglena are more closely related to each other than any other pair of organisms as they both belong to the Phylum Protista and show similar characteristics.

Who was the first scientist to classify living organisms? ›

Swedish naturalist and explorer Carolus Linnaeus was the first to frame principles for defining natural genera and species of organisms and to create a uniform system for naming them, known as binomial nomenclature.

Who is the father of taxonomy? ›

Today is the 290th anniversary of the birth of Carolus Linnaeus, the Swedish botanical taxonomist who was the first person to formulate and adhere to a uniform system for defining and naming the world's plants and animals.


2. Diversity in Living Organisms 01 | Introduction to Classification | Class 9 | NCERT | Sprint
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3. Diversity in Living Organisms - Class 9 Science (Part 1)
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4. class 9 chapter 7 diversity in living organisms question answer, notes NCERT science book
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5. Understand Diversity in Living Organisms | CBSE Class 9 Science (Biology) Chapter 7 | NCERT Vedantu
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6. Class9th Science chapter 7 Diversity in Living Organisms intext Ques Solutions
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