Patterns in Life: Diversity and Classification — CBSE Class 9 Science Important Questions
14 CBSE Class 9 Science practice questions on Patterns in Life: Diversity and Classification, each with a full model answer, covering 5 topics from the chapter in the question formats used in the exam.
By The Classmate AI Editorial Team
Reviewed by Classmate AI Team · 17 October 2026
Last updated 25 October 2026
- 14
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- Topics
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- Key concepts
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- With answers
CBSE Class 9 Patterns in Life (Diversity and Classification) questions cover why we classify organisms, the hierarchy from kingdom to species, binomial nomenclature, Whittaker's five kingdoms and their features, the major groups of plants (Thallophyta to Angiosperms) and of animals (chordates and non-chordates), lichens, viruses as acellular entities, and the three domains of life.
About Patterns in Life: Diversity and Classification
This chapter is about the enormous biodiversity of living things and how scientists classify them into groups based on similarities and differences. It introduces the hierarchy of classification from Kingdom to Species, Linnaeus's binomial nomenclature, Whittaker's five-kingdom system, the major groups of plants and animals, partnerships such as lichens, viruses that fit no kingdom, and the newer three-domain grouping based on molecular studies.
Key concepts & formulas
Classification groups the huge variety of organisms by similarities and differences, making them easier to study, showing relationships and evolutionary links, and helping us understand the whole living world through a few representatives.
Organisms are placed in a descending order of groups: Kingdom, Phylum (Division in plants), Class, Order, Family, Genus, Species. Species is the smallest unit — a group of similar organisms that can interbreed.
R. H. Whittaker classified life into Monera, Protista, Fungi, Plantae and Animalia based on cell structure (prokaryotic/eukaryotic), body organisation (unicellular/multicellular) and mode of nutrition (autotrophic/heterotrophic).
Viruses are acellular (genetic material in a protein coat) and reproduce only inside a host cell, so they fit no kingdom. Lichens are partnerships of an alga and a fungus. Molecular studies group all cells into three domains: Bacteria, Archaea and Eukarya.
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Important questions with answers
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Multiple-choice questions (1 mark)
The basic (smallest) unit of classification is:
- (a)
kingdom
- (b)
genus
- (c)
species
- (d)
family
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Answer: (c) species.
Species is the smallest unit of classification — a group of organisms so similar that they can interbreed and produce fertile offspring.
A lichen is a close partnership between:
- (a)
an alga and a fungus
- (b)
a bacterium and a virus
- (c)
a moss and a fern
- (d)
two different fungi
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Answer: (a) an alga and a fungus.
The alga (or cyanobacterium) makes food by photosynthesis, and the fungus absorbs water and minerals and gives shelter. Both partners benefit, which is why lichens can grow on bare rocks and tree bark.
In the scientific name Mangifera indica, the word indica denotes the:
- (a)
kingdom
- (b)
genus
- (c)
species
- (d)
family
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Answer: (c) species.
In binomial nomenclature the first word (Mangifera) is the genus and the second word (indica) is the species. The genus begins with a capital letter and the species with a small letter.
On the basis of molecular (genetic) studies, all living organisms are now also grouped into three domains. These are:
- (a)
Bacteria, Archaea and Eukarya
- (b)
Monera, Protista and Fungi
- (c)
Plants, animals and fungi
- (d)
Prokaryotes, eukaryotes and viruses
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Answer: (a) Bacteria, Archaea and Eukarya.
Bacteria and Archaea are both prokaryotic but differ at the molecular level; all eukaryotes (protists, fungi, plants and animals) form the domain Eukarya. Viruses are not placed in any domain because they are not cells.
Assertion–Reason questions (1 mark)
Assertion (A): Fungi are placed in a kingdom separate from plants.
Reason (R): Fungi have a saprophytic (heterotrophic) mode of nutrition and cannot make their own food.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true but R is not the correct explanation of A
- (c)
A is true but R is false
- (d)
A is false but R is true
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Answer: (a) Both A and R are true and R is the correct explanation of A.
Unlike green plants, fungi lack chlorophyll and obtain food from dead organic matter (saprophytic nutrition). This different mode of nutrition is exactly why Whittaker placed them in a separate kingdom, Fungi.
Very short answer questions (2 marks)
What is biodiversity? Why do we need to classify living organisms?
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Biodiversity is the variety of living organisms (plants, animals and micro-organisms) found in a region or on the Earth.
We classify organisms because there is a vast variety of them; grouping by similarities and differences makes them easier to study and identify, shows how different groups are related, and lets us understand the whole living world through a few representative types.
State the two rules followed while writing the scientific name of an organism using binomial nomenclature.
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The name has two parts — the genus (written first, beginning with a capital letter) and the species (written second, beginning with a small letter).
-
The scientific name is written in italics (or underlined separately when handwritten), e.g. Homo sapiens.
Distinguish between chordates and non-chordates, giving one example of each.
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Chordates have a notochord (a rod-like support along the back) at some stage of life and a hollow nerve cord on the back (dorsal side). In vertebrates the notochord is replaced by a backbone. Example: fish, frog, human.
Non-chordates have no notochord, and their nerve cord, if present, is solid and on the belly (ventral) side. Example: earthworm, cockroach, starfish.
Short answer questions (3 marks)
Name the five major groups of the plant kingdom. For each, state the feature that sets it apart and give one example.
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| Group | Distinguishing feature | Example |
|---|---|---|
| Thallophyta (algae) | Body not differentiated into root, stem and leaves | Spirogyra, Ulothrix |
| Bryophyta | Body has stem-like and leaf-like parts, but no vascular tissue (xylem and phloem); the 'amphibians of the plant kingdom' | Moss (Funaria), Marchantia |
| Pteridophyta | Root, stem and leaves with vascular tissue, but no seeds (reproduce by spores) | Fern, Marsilea |
| Gymnosperms | Bear naked seeds (not enclosed in a fruit) | Pine, Cycas |
| Angiosperms | Bear flowers and seeds enclosed in fruits | Mango, wheat |
Why are viruses not placed in any of the five kingdoms? Give two features of viruses and name two diseases they cause.
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The five kingdoms are based on cell structure, but viruses are acellular: they are not made of cells at all, so they do not fit any kingdom.
Features (any two): a virus is a particle of genetic material (DNA or RNA) inside a protein coat; it has no cytoplasm or cell organelles; it shows life-like activity (reproduction) only inside a living host cell, and outside a host it behaves like a non-living particle.
Diseases (any two): common cold, influenza, COVID-19, polio, measles, AIDS.
Amoeba and a bacterium are both single-celled. Why are they placed in two different kingdoms? Explain the key difference.
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Although both are unicellular, they differ in the most fundamental feature — cell type.
A bacterium has a prokaryotic cell: it lacks a true, membrane-bound nucleus and membrane-bound organelles. Hence it is placed in kingdom Monera.
Amoeba has a eukaryotic cell: its genetic material is enclosed in a true nucleus and it has membrane-bound organelles. Hence it is placed in kingdom Protista.
Since the presence or absence of a true nucleus is a basic criterion of classification, the two are placed in different kingdoms.
Long answer questions (5 marks)
Give the main characteristics of each of the five kingdoms — Monera, Protista, Fungi, Plantae and Animalia — with one example of each.
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Monera: prokaryotic (no true nucleus), unicellular; nutrition autotrophic or heterotrophic; cell wall may be present. Example: bacteria, blue-green algae.
Protista: eukaryotic, unicellular; some have organs of locomotion like cilia or flagella; autotrophic or heterotrophic. Example: Amoeba, Paramecium, Euglena.
Fungi: eukaryotic, mostly multicellular; cell wall of chitin; saprophytic or parasitic heterotrophs (no chlorophyll). Example: Rhizopus, mushroom, yeast.
Plantae: eukaryotic, multicellular; cell wall of cellulose; autotrophic (photosynthesis using chlorophyll). Example: mango tree, fern, moss.
Animalia: eukaryotic, multicellular; no cell wall; heterotrophic (holozoic) nutrition; most can move. Example: human, earthworm, fish.
(a) What is meant by the hierarchy of classification?
(b) Explain, with the example of humans, how an organism is classified from kingdom to species.
(c) Why does the number of common characters decrease as we move from species to kingdom?
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(a) The hierarchy of classification is the arrangement of organisms into a series of groups placed one below another in a definite order — Kingdom, Phylum, Class, Order, Family, Genus, Species — each smaller group sharing more characters.
(b) Human classification:
Kingdom Animalia to Phylum Chordata to Class Mammalia to Order Primates to Family Hominidae to Genus Homo to Species sapiens. So the scientific name of humans is Homo sapiens.
(c) As we move up from species to kingdom, each group becomes larger and includes more and more diverse organisms, so the number of characters they all share becomes fewer. As we move down to species, the group is smaller and the members are more alike, so they share more common characters.
Case-based questions (4 marks)
A scientist collects four organisms: a bacterium, a mushroom, a moss plant and an earthworm. She notes that one has no true nucleus, one obtains food from dead organic matter, one makes its own food by photosynthesis, and one takes in solid food and has no cell wall.
(i) Assign each organism to its correct kingdom.
(ii) Which of these is a prokaryote?
(iii) State the mode of nutrition of the mushroom.
(iv) Which two features distinguish the moss from the earthworm?
Show model answer
(i) Bacterium to Monera; mushroom to Fungi; moss to Plantae; earthworm to Animalia.
(ii) The bacterium is a prokaryote (it has no true, membrane-bound nucleus).
(iii) The mushroom is saprophytic — it is a heterotroph that absorbs food from dead and decaying organic matter.
(iv) The moss (Plantae) has a cell wall of cellulose and is autotrophic (makes its own food), whereas the earthworm (Animalia) has no cell wall and is heterotrophic.
All CBSE Class 9 Science Chapters
Frequently asked questions
What are the important questions in Patterns in Life: Diversity and Classification?
Why we classify, the hierarchy from kingdom to species, binomial nomenclature, Whittaker's five kingdoms, plant and animal groups, lichens, viruses and the three domains of life. This page has 14 questions with answers, including a case study sorting four collected organisms.What are Whittaker's five kingdoms?
Monera, Protista, Fungi, Plantae and Animalia, separated by cell type (prokaryotic or eukaryotic), body organisation (unicellular or multicellular) and mode of nutrition. Bacteria are Monera; Amoeba, though also single-celled, is a eukaryote and so belongs to Protista.What are the rules of binomial nomenclature?
Each organism gets two names: the genus, starting with a capital letter, and the species, starting with a small letter, printed in italics or underlined separately when handwritten. In Mangifera indica, Mangifera is the genus and indica the species.Why are viruses not placed in any of the five kingdoms?
Viruses are not made of cells: they are genetic material inside a protein coat, and they can reproduce only inside a living host cell. Outside a host they show no life activity. Common viral diseases include the common cold and influenza.Which chapter is the last in the new CBSE Class 9 Science book?
Earth as a System: Energy, Matter and Life (Chapter 13) follows Patterns in Life (Chapter 12) and closes the book. Reproduction (Chapter 11) comes before Patterns in Life; each has an important-questions page here.How do I remember the hierarchy of classification?
Learn the order Kingdom, Phylum (Division for plants), Class, Order, Family, Genus, Species with a mnemonic, and remember that organisms share more features the lower the level. Species, the smallest unit, is a group that can interbreed.Can I download Diversity and Classification Class 9 questions?
Yes. Enter your email in the free PDF box on this page and all 14 classification questions, the five-kingdom table included, open with answers as a printable worksheet.
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