NCERT Solutions for Class 9 Science Exploration Chapter 12 Patterns in Life: Diversity and Classification 2026-27

Revise, Reflect, Refine (NCERT Textbook Page No. 249)

Question 1. Meena and Han observed an animal in their garden. Han called it an insect while Meena said it was an earthworm. Choose the correct option which confirms that it is an insect.
(i) Bilateral symmetrical body
(ii) Body with jointed legs
(iii) Cylindrical body
(iv) Body with little segmentation

Answer: (ii) Body with jointed legs

Insects belong to the group Arthropoda. A key feature of arthropods is the presence of jointed legs. Hence, this feature confirms that the animal is an insect.

Question 2. Sponges represent one of the simplest animal body plans. Their bodies lack true tissues and organs. Which feature of sponge cells supports its classification under the animal kingdom?
(i) Absence of mitochondria
(ii) Ability to photosynthesise
(iii) Presence of a cell membrane
(iv) Presence of a cell wall

Answer: (iii) Presence of a cell membrane

Sponges are placed in the animal kingdom because their cells show animal-like features. They have a cell membrane and do not have a cell wall like plants. They also cannot make their own food by photosynthesis.

Question 3. Observe two different animals in your immediate environment. What features help you distinguish between them? How do these features help place them into different groups?

Answer: Two animals such as a dog and a butterfly can be compared using their body features.

A dog has a backbone, hair on its body and moves by walking. A butterfly has wings, jointed legs and an outer skeleton. These differences help us classify them into different groups.

The dog is a vertebrate because it has a backbone, while the butterfly is an invertebrate and belongs to Arthropoda. Thus, body structure, movement and presence or absence of backbone help in classification.

Question 4. How would a scientist justify choosing cellular organisation as a more fundamental characteristic for the basis of classification rather than the presence of xylem and phloem?

Answer: Cellular organisation is a more basic feature because it is found in all living organisms. It helps us understand whether an organism is unicellular or multicellular and whether its cells are simple or complex.

Xylem and phloem are specialised tissues found only in higher plants. They cannot be used to classify animals, fungi, bacteria or many simple organisms. Therefore, cellular organisation is a broader and more fundamental basis of classification.

Question 5. You find an unlabelled slide of a single-celled organism that has a well-defined nucleus and multiple cilia. Which group would it most likely belong to? Give reasons.

Answer: The organism most likely belongs to Kingdom Protista.

This is because it is single-celled and has a well-defined nucleus, which means it is a eukaryote. The presence of cilia also suggests that it may be similar to organisms like Paramecium, which are included in Protista.

Question 6. How does the diversity of organisms contribute to the balance and stability of an ecosystem?

Answer: Diversity of organisms helps maintain balance in an ecosystem because different organisms perform different roles.

Plants act as producers by preparing food. Animals act as consumers and also help in pollination and seed dispersal. Microorganisms decompose dead matter and recycle nutrients.

This interdependence keeps the ecosystem stable. If biodiversity is reduced, food chains and ecological balance may get disturbed.

Question 7. If all unicellular organisms were grouped into a single kingdom, what problems would arise?

Answer: If all unicellular organisms were placed in one kingdom, classification would become confusing.

It would group together very different organisms, such as bacteria and protists. Bacteria do not have a true nucleus, while protists have a well-defined nucleus. Their nutrition, reproduction and cell structure are also different.

Such grouping would ignore important differences and would not show correct evolutionary relationships.

Question 8. Viruses were studied in earlier classes. Why are they not placed in any of the five kingdoms? Give reasons.

Answer: Viruses are not included in any of the five kingdoms because they do not have a cellular structure. They cannot carry out life processes on their own.

They remain inactive outside a host cell and reproduce only inside living cells. Since they show both living and non-living features, they do not fit properly into the five-kingdom classification.

Question 9. If you were asked to revise the five-kingdom classification, would you create a separate category for viruses or keep them outside the system? Justify your answer and explain what this indicates about the evolving nature of scientific classification.

Answer: Viruses can be kept outside the five-kingdom system because they are acellular and cannot live independently. They do not show complete cellular organisation, which is an important basis of classification.

However, they may be studied under a separate special category for convenience. This shows that classification systems are not permanent. They change as scientists discover new facts about organisms and their relationships.

Question 11. Both pteridophytes and bryophytes lack flowers and seeds, yet they are placed in different groups. Explain this classification using their key features.

Answer: Bryophytes and pteridophytes both do not have flowers or seeds, but they differ in their body structure.

Bryophytes are simple plants. They do not have true roots, stems and leaves. They also lack vascular tissues like xylem and phloem. Examples include mosses.

Pteridophytes are more developed than bryophytes. They have true roots, stems and leaves. They also have vascular tissues for transport of water and food. Examples include ferns.

So, they are placed in different groups because pteridophytes have vascular tissues and a more organised plant body.

Question 12. In the classification hierarchy, which group-class or genus has fewer members but more features in common? Explain your answer.

Answer: The genus has fewer members but more common features.

Genus is a lower category than class in the classification hierarchy. Organisms placed in the same genus are closely related and share many similar characters. A class contains many genera, so its members show fewer common features compared to members of the same genus.

Question 13. A scientist discovers a new organism with the characteristic features of locomotion and autotrophic nutrition. Which character(s) would help the scientist identify the organism belonging to Protista according to the five-kingdom classification?

Answer: To identify the organism as Protista, the scientist should check whether it is unicellular and eukaryotic.

Important features include:

• It has only one cell.

• It has a well-defined nucleus.

• It can move using cilia, flagella or pseudopodia.

• It may show autotrophic nutrition, heterotrophic nutrition or both.

If the organism is unicellular, eukaryotic, motile and autotrophic, it may belong to Protista.

Question 14. A researcher identified a unicellular eukaryotic organism as fungi. What identification key would you suggest according to the five-kingdom classification to keep a unicellular organism in the Kingdom Fungi?

Answer: To place a unicellular eukaryotic organism in Kingdom Fungi, the researcher should check for fungal features.

The organism should have:

• A cell wall made of chitin

• No chlorophyll

• Heterotrophic mode of nutrition

• Absorption of nutrients from dead or living matter

• Reproduction by spores or budding

• Mostly non-motile nature

If these features are present, the organism can be placed in Kingdom Fungi.

Question 15. During a long-term ecological study, students examined organisms collected from three different environments – a freshwater pond, damp soil near decaying logs, and the digestive tract of animals. Instead of naming organisms directly, scientists recorded only structural, cellular, and nutritional features as given in the table below.

Organisms | Key Observations
P | Microscopic; no true nucleus; rigid cell covering; survives high salinity and temperature
Q | Multicellular; iflamentous body; cell wall present; no chlorophyll; grows on dead organic matter
R | Unicellular; true nucleus; contractile vacuole present; moves using flagella; shows photosynthesis in light but heterotrophic in the absence of light
S | Multicellular; well-differentiated tissues; backbone present; aquatic respiration during early life stage
T | A cellular contains genetic material; remains inactive outside a host cell

The students realised that some organisms fit neatly into Whittaker’s five-kingdom classification, while others challenged the very basis of this classification.

Based on the case study, answer the following questions –
(i) Identify one organism that clearly belongs to the Kingdom Fungi. State one observation that supports your answer.
(ii) Which organism would be placed in the Kingdom Monera? Mention one characteristic that justifies this placement.
(iii) Organisms R and Q are both eukaryotic, yet they are placed in different kingdoms. Analyse the criteria that separate them.
(iv) Explain why organism S cannot be classified using the mode of nutrition alone.
(v) Organism T does not fit into any of the five kingdoms. Which fundamental characteristic used in classification does it lack, and what does this reveal about the limitations of classification systems?
(vi) If classification were based only on habitat, which organisms might be incorrectly grouped together? Explain the scientific consequences of such a classification.
(vii) Imagine scientists discover a new organism that is multicellular, eukaryotic, lacks chlorophyll, and absorbs nutrients from a host externally. Should it be placed under fungi or animalia? Justify your reasoning using classification criteria.

Answer: (i) Organism Q belongs to Kingdom Fungi. It is multicellular, filamentous, has a cell wall, lacks chlorophyll and grows on dead organic matter. These are typical features of fungi.

(ii) Organism P would be placed in Kingdom Monera. It has no true nucleus, which means it is prokaryotic. This is the main characteristic of organisms in Monera.

(iii) Organisms R and Q are both eukaryotic, but they differ in organisation and nutrition.
Organism R is unicellular, has a true nucleus, moves with flagella and can show both autotrophic and heterotrophic nutrition. So, it fits in Protista.
Organism Q is multicellular, filamentous and absorbs nutrients from dead organic matter. So, it belongs to Fungi.

(iv) Organism S cannot be classified only by its mode of nutrition because many animals are heterotrophic. Its structural features are more important. It is multicellular, has well-differentiated tissues and a backbone. These features place it in Kingdom Animalia.

(v) Organism T lacks cellular organisation. It contains genetic material but is acellular and remains inactive outside a host cell. This indicates that it is a virus. It shows that the five-kingdom system has limitations because it cannot properly include acellular forms like viruses.

(vi) If classification were based only on habitat, organisms from different kingdoms could be wrongly placed together. For example, an aquatic protist and an aquatic animal stage may be grouped together just because both live in water.

This would be scientifically incorrect because it ignores cell type, body organisation, nutrition and evolutionary relationships.

(vii) The new organism should be placed under Kingdom Fungi.

It is multicellular and eukaryotic, lacks chlorophyll and absorbs nutrients from a host externally. These are fungal features. Animals usually ingest food and digest it inside the body, while fungi absorb nutrients after external digestion.

Class 9 Science Chapter 12 (InText)

Think it Over (NCERT Textbook Page No. 228)

Question 1. What do you understand by biodiversity?

Answer: Biodiversity means the variety of living organisms present on Earth. It includes different plants, animals and microorganisms, along with the habitats and ecosystems in which they live.

Question 2. How does the grouping of organisms help us understand diversity?

Answer: Grouping organisms helps us organise the huge variety of living beings into smaller groups. This makes it easier to study their similarities, differences and relationships.

It also helps us understand how organisms are related to one another and how diversity has developed over time.

Question 3. On what basis are plants and animals classified?

Answer: Plants and animals are classified on the basis of their similarities and differences.

Some important features used for classification are:

• Body structure

• Mode of nutrition

• Habitat

• Presence or absence of specialised organs

• Presence or absence of backbone in animals

• Presence of vascular tissues, seeds, flowers or fruits in plants

Question 4. How does classification help address problems in farming?

Answer: Classification helps farmers identify crops, weeds, pests and disease-causing organisms correctly.

It also helps in selecting suitable crop varieties, understanding growth conditions and managing pests or diseases. This improves farming practices and helps increase crop production.

Pause and Ponder (NCERT Textbook Page No. 231)

Question 1. If many organisms share common features, could they also share a common ancestry?

Answer: Yes, organisms that share many common features may also share a common ancestry.

Similar body structures or functions suggest that these organisms may have evolved from a common ancestor. Over time, they may have changed and adapted to different environments, but some basic similarities remain.

Thus, shared features help scientists understand evolutionary relationships.

Pause and Ponder (NCERT Textbook Page No. 236)

Question 2. How can a single-celled organism carry out all its life processes when billions of cells are required to perform similar functions in multicellular organisms like us?

Answer: A single-celled organism can perform all life processes within one cell. The same cell carries out nutrition, respiration, excretion, movement and reproduction.

Different parts of the cell perform specific functions. For example, the cell membrane controls entry and exit of substances, the cytoplasm carries out many chemical activities, and the nucleus controls cell functions.

In multicellular organisms, different cells are specialised for different functions. These cells form tissues, organs and organ systems to divide the work.

Pause and Ponder (NCERT Textbook Page No. 238)

Question 3. Which plant features reduce their dependence on water but still require moist conditions?

Answer: Bryophytes and pteridophytes show features that help them live on land, but they still need moist conditions for reproduction.

They may have simple plant bodies or vascular tissues, but water is still needed for fertilisation. Therefore, they are commonly found in damp and shady places.

Question 4. Why do taller plants need specialised transport tissues?

Answer: Taller plants need specialised transport tissues because water, minerals and food must be carried over long distances.

Xylem transports water and minerals from roots to other parts of the plant. Phloem transports food prepared in leaves to different parts. Without these tissues, tall plants would not be able to survive efficiently.

Question 5. How do seeds and fruits affect where and how plants can survive?

Answer: Seeds and fruits help plants spread to new places. Fruits protect the seeds and also help in seed dispersal through wind, water, animals or humans.

When seeds are dispersed away from the parent plant, they get more space, light and nutrients. This reduces competition and increases the chances of survival.

Pause and Ponder (NCERT Textbook Page No. 242)

Question 6. An earthworm (Annelida) and a beetle (Arthropoda) both have segmented bodies, but the beetle has a hard external skeleton. How does the beetle’s external skeleton help it survive?

Answer: The beetle’s hard external skeleton is called an exoskeleton. It protects the body from injury and predators.

It also prevents water loss, gives support and shape to the body and provides attachment points for muscles. This helps the beetle move and survive better on land.

Pause and Ponder (NCERT Textbook Page No. 247)

Question 7. Does the term ‘biodiversity’ relate only to the variety of organisms, or does it encompass other elements?

Answer: Biodiversity does not mean only the variety of organisms. It also includes variation within species and variety of ecosystems.

It includes:

• Genetic diversity: Differences among individuals of the same species

• Species diversity: Variety of species in an area

• Ecosystem diversity: Variety of habitats such as forests, ponds, grasslands and deserts

Question 8. If you find a new organism in a pond, what features will you observe to classify it and why?

Answer: To classify a new organism found in a pond, we should observe its important features.

These include:

• Whether it is unicellular or multicellular

• Whether it has a true nucleus

• Its mode of nutrition

• Its body structure

• Its method of movement

• Its method of reproduction

• Its habitat and adaptations

These features help identify the group to which the organism belongs.

Question 9. Why do genetic studies provide deep information about living beings?

Answer: Genetic studies give deep information because genes carry hereditary instructions.

They help explain how organisms inherit characters, why they differ from one another and how they are related. Genetic studies also help scientists understand evolution, common ancestry, growth, reproduction and body functions.

Question 10. How can changes in climate affect the biodiversity?

Answer: Climate change can affect biodiversity by changing temperature, rainfall and habitat conditions.

Some organisms may not be able to adapt and may become endangered or extinct. Habitats such as forests, wetlands and coral reefs may be damaged. Species may move to new areas, and food chains may get disturbed.

Thus, climate change can reduce biodiversity and disturb ecosystem balance.

Class 9 Science Chapter 12 Question Answer (Activities)

Activity 12.1: 

Let Us Compare And Classify (NCERT Textbook Page No. 230-231) (Refer Fig. 12.2 of NCERT Textbook.)

Question 1. Ponder on the questions given below:

Which animals can you identify in the given picture?

Answer: The animals seen in the picture include tiger, leopard, owl, eagle, dragonfly, frog, deer, snake, rabbit, firefly, birds, bear, crocodile, langur, peacock, raccoon, loris, hedgehog, bat and lion-tailed macaque.

Question. Where are they seen?

Answer: These animals are found in different habitats.

• Air: Eagle, owl, bat, dragonfly, firefly and other birds are seen flying.

• Land: Tiger, leopard, deer, rabbit, bear, snake, hedgehog, peacock and raccoon live mostly on land.

• Water or near water: Crocodile and frog are found in or around water bodies.

• Both land and water: Frog and crocodile can live in both places.

• Trees: Langur, loris and lion-tailed macaque are mostly seen on trees.

• Ground or bushes: Snake, hedgehog and some small animals may live on the ground or under bushes.

Question. Which animals in the picture seem active:
(i) during the day?
(ii) during the night?
(iii) both durîng the day and night?

Answer: (i) Animals active during the day: Tiger, deer, peacock, eagle, langur, lion-tailed macaque and many birds are generally active in the daytime.

(ii) Animals active during the night: Owl, bat, raccoon, loris, hedgehog and firefly are mostly active at night.

(iii) Animals active during both day and night: Leopard, snake, frog, crocodile, bear and rabbit may be active during both day and night depending on food, safety and surroundings.

Question 2. Record your observations in Table 12.1

Answer: Students can record the animals from the picture based on their habitat, body covering, movement and activity time. For example, birds can be grouped as flying animals, tiger and deer as land animals, crocodile and frog as water-related animals, and owl and bat as nocturnal animals.

Question 3. Now, try grouping the same organisms in more than one way. Each time, change the criterion you are using for grouping (Table 12.2).

Table 12.2: Grouping the organisms

Conclusion: Organisms can be grouped in many ways, such as habitat, food habits, body covering and activity time. The same animal may belong to more than one group depending on the feature selected. This shows that classification helps us organise biodiversity in a systematic way.

Activity 12.2: 

Let Us Read A Case Study (NCERT Textbook Page No. 232)

Question 1. How are species distributed within a forest? Which plants and animals are closely linked?

Answer: Species are not distributed equally throughout a forest. They are found in places where they get suitable food, shelter and living conditions.

For example, hornbills are usually found near large trees and fruit-bearing plants. Hornbills depend on fruit trees for food, while many trees depend on hornbills for seed dispersal. This shows that some plants and animals are closely connected in an ecosystem.

Question 2. How does classifying the four hombill species help us understand biodiversity?

Answer: Classifying the four hornbill species helps scientists study their similarities, differences and distribution in the forest. It also helps in understanding their relationship with specific trees, fruits, nesting sites and habitats.

This makes it easier to study biodiversity and plan conservation measures.

Think and discuss the case based on the following questions:

(i) How can scientists keep track of so many species?

Answer: Scientists keep track of species by using classification, field surveys, photographs, tagging, observations and digital records. By grouping organisms based on common features, scientists can identify and study them more easily.

This organised method helps in monitoring biodiversity and detecting changes in species populations.

(ii) The four hornbills look similar in some ways. What features can help scientists distinguish them from one another?

Answer: Scientists can distinguish hornbill species by observing their body size, colour pattern, beak shape, casque size, calls, feeding habits and nesting behaviour.

Their preferred habitat and the type of trees they use for nesting can also help in identifying them.

(iii) What would happen if the large, old trees disappeared from the forest?

Answer: If large, old trees disappear, hornbills may lose their nesting places because they use tree cavities for nesting. Their food sources may also reduce if fruit-bearing trees are lost.

This can lead to a decline in hornbill populations. Other organisms depending on these trees or on hornbills for seed dispersal may also be affected, disturbing the forest ecosystem.

Activity 12.3:

Let Us Study (NCERT Textbook Page No. 234-235)

Question 1. Study the concept map (Fig. 12.5).

Answer: Do it yourself by carefully studying Fig. 12.5 in the NCERT textbook. Observe how organisms are grouped based on cell type, cell structure, organisation and mode of nutrition.

Question 2. List the criteria which form the basis of five kingdom classification.

Answer: The five kingdom classification is based on the following criteria:

• Cell type: prokaryotic or eukaryotic

• Cell structure: presence or absence of cell wall

• Level of organisation: unicellular or multicellular

• Mode of nutrition: autotrophic or heterotrophic

• Type of cell wall, such as cellulose or chitin

• Role in ecosystem, such as producer, consumer or decomposer

Question 3. Compare the criteria you have listed after studying the concept map and the criteria given below:
Cell type-prokaryotic or eukaryotic
Cell structure-presence or absence of a cell wall
Level of organisation-unicellular or multicellular
Mode of nutrition-autotropic or heterotrophic

Answer: The criteria from the concept map are similar to the given criteria. Both include cell type, cell wall, level of organisation and mode of nutrition.

The concept map gives more detail by showing the type of cell wall, such as cellulose in plants and chitin in fungi. It also connects nutrition with ecological roles like producers, consumers and decomposers.

Activity 12.4:

Let Us Explore (NCERT Textbook Page No. 235)

Aim: To observe different shapes of bacteria and cyanobacteria and compare them with the diagram (Fig. 12.6).

Observations: Different shapes of bacteria can be observed, such as:

• Cocci: round or spherical bacteria

• Bacilli: rod-shaped bacteria

• Spirilla: spiral-shaped bacteria

• Vibrio: comma-shaped bacteria

Cyanobacteria appear as simple microscopic organisms. Some may be seen as chains or colonies. Their shapes are similar to those shown in Fig. 12.6.

Conclusion: Bacteria and cyanobacteria are unicellular prokaryotic organisms. They belong to Kingdom Monera. They are found in many environments, including extreme conditions. Some are useful in nutrient cycling and biogas production, while some may cause diseases.

Activity 12.5:

Let Us Make (NCERT Textbook Page No. 235-236)

Aim: To prepare a hay infusion and observe microorganisms (Protists) under a microscope.

Observation: Tiny moving organisms are seen in the water sample. They differ in shape and size. Some move with the help of cilia, flagella or pseudopodia.

On comparing them with Fig. 12.7, they can be identified as protists such as Amoeba, Paramecium and Euglena.

Conclusion: The observed organisms belong to Kingdom Protista. Protists are mostly unicellular eukaryotic organisms found in water or moist places. They may be autotrophic or heterotrophic and play an important role in aquatic food chains, oxygen production and nutrient cycling.

Activity 12.6:

Let Us Explore (NCERT Textbook Page No. 238)

Aim: To observe bryophytes and compare them with the leaves of common plants.

Observation: Bryophytes are small, green and soft plants. They do not have true roots, stems or leaves. Their leaf-like structures are simple and thin.

Unlike higher plants, bryophytes do not have well-developed vascular tissues such as xylem and phloem.

Conclusion: Bryophytes are simple non-vascular plants. They are different from common plants because they lack true roots, stems and leaves. They need water for reproduction and are therefore called the “amphibians of the plant kingdom.”

Activity 12.7:

Let Us Compare (NCERT Textbook Page No. 238)

Aim: To compare the cross-section of a fern stem (pteridophyte) with that of a sunflower stem (higher plant).

Observation: In a fern stem, vascular tissues are present but are less organised. They may be arranged in a simple or scattered pattern.

In a sunflower stem, the vascular tissues are well-developed and arranged in a ring. Xylem and phloem are clearly visible and more organised.

Conclusion: Ferns have simpler vascular tissues, while higher plants like sunflower have more developed and organised transport tissues. This shows that higher plants are more advanced in structure and function than pteridophytes.

Activity 12.8:

Let us Discuss (NCERT Textbook Page No. 239)

Aim: To study different leaves, observe their shape and venation, and classify them as monocots or dicots.

Observation: Different leaves show different shapes and venation patterns.

Some leaves are narrow and show parallel venation. These are grouped as monocots. Some leaves are broader and show reticulate, or net-like, venation. These are grouped as dicots.

Adaptations observed:

• Narrow leaves help reduce water loss.

• Broad leaves help absorb more sunlight for photosynthesis.

• Venation supports the leaf and helps transport water, minerals and food.

Conclusion: Leaves can be classified as monocot or dicot based on venation. Their shape and structure help plants survive in different environments by reducing water loss or increasing food production.

Activity 12.9: 

Let Us Study (NCERT Textbook Page No. 239-240)

Aim: To study the salient features of faced by different plant groups-Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms, and analyse the adaptations and challenges faced by each group.

Answer:

Conclusion: Plant groups show a gradual increase in complexity from Thallophyta to Angiosperms. Simple plants depend more on water, while advanced plants have vascular tissues, seeds, flowers and fruits. These features help them survive better on land and reproduce more successfully.

Key Concepts You Will Learn in Class 9 Science Chapter 12

This chapter builds a strong foundation in understanding how the living world is organised. Students learn that classification is based on fundamental features such as whether a cell is prokaryotic or eukaryotic, whether an organism is unicellular or multicellular, and how it obtains its food. The chapter explains the five-kingdom system proposed by Whittaker and why organisms like bacteria, protists, fungi, plants, and animals are placed in separate kingdoms.

Learners also explore how plants are grouped from the simplest thallophytes to the most advanced angiosperms, and how animals are distinguished by features like the presence of a backbone, body symmetry, and skeletal structure. The chapter highlights the evolving nature of scientific classification, using examples such as viruses that challenge existing systems.

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CBSE Class 9 Science Chapter 12 Patterns in Life: Diversity and Classification Study Materials

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