This MCQ module is based on: Patterns in Life: Diversity and Classification — NCERT Exercises
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Patterns in Life: Diversity and Classification — NCERT Exercises
🎓 Class 9
Science
CBSE
Theory
Ch 12 — Patterns in Life: Diversity and Classification
⏱ ~13 min
🌐 Language: [gtranslate]
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This assessment will be based on: Patterns in Life: Diversity and Classification — NCERT Exercises
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Chapter Summary
Chapter 12 builds the framework for thinking about life as an organised tree of related groups. From the broad question "why classify?" we moved through the seven-step taxonomic hierarchy, met Linnaeus's two-name naming system, surveyed Whittaker's five kingdoms, and then explored the major divisions of the plant and animal kingdoms.
BiodiversityThe variety of life at three levels — genetic, species and ecosystem.
Why classifyManage variety, reveal relationships, identify new specimens, support all biology.
BasisCell type → cellular organisation → mode of nutrition → body organisation → body plan.
HierarchyKingdom → Phylum → Class → Order → Family → Genus → Species.
Binomial namesTwo-word Latin names; genus capitalised, species lowercase, italics or underline. Linnaeus.
5 Kingdoms (Whittaker)Monera, Protista, Fungi, Plantae, Animalia.
PlantaeThallophyta → Bryophyta → Pteridophyta → Gymnosperms → Angiosperms (Mono/Dicot).
Animalia (9 phyla)Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata.
Vertebrate classesPisces, Amphibia, Reptilia, Aves, Mammalia.
Keyword Grid
BiodiversityVariety of life forms.
TaxonomyScience of naming and classifying.
HierarchyNested categories from Kingdom to Species.
BinomialTwo-word scientific name.
LinnaeusFounder of binomial naming.
WhittakerProposed 5-kingdom system (1969).
MoneraProkaryotic, unicellular kingdom.
ProtistaEukaryotic, unicellular kingdom.
FungiSaprophytic eukaryotes; chitinous walls.
ThallophytaAlgae; undifferentiated body.
BryophytaMosses, liverworts; "amphibians of plants".
PteridophytaFerns; first vascular plants; spore-bearing.
GymnospermNaked seeds in cones.
AngiospermSeeds enclosed in fruit; flowering plants.
Monocot1 cotyledon; parallel veins; fibrous root.
Dicot2 cotyledons; reticulate veins; tap root.
PoriferaSponges; pore-bearing, no tissues.
CnidariaHydra, jellyfish; stinging cells.
ArthropodaLargest phylum; jointed legs.
ChordataNotochord; includes all vertebrates.
NCERT Exercises with Solutions
Click "Show Solution" under each question to reveal the worked answer.
Q1What is biodiversity? Name the three levels at which it is studied.
Biodiversity is the total variety of living organisms — including the variety of species, the genetic variety within species, and the variety of ecosystems they live in.
Three levels: (i) Genetic diversity — variation in genes among individuals of the same species; (ii) Species diversity — number of different species in a region; (iii) Ecosystem diversity — variety of habitats and ecological communities.
Q2Why do we classify organisms? Give any three reasons.
(i) It makes the study of millions of life forms manageable by reducing them to logical groups.
(ii) It reveals evolutionary relationships among organisms.
(iii) It helps in identifying any new organism by placing it in an existing group based on its features.
Q3List the seven taxonomic categories in the correct order from largest to smallest, with one example.
Kingdom (Animalia) → Phylum (Chordata) → Class (Mammalia) → Order (Primates) → Family (Hominidae) → Genus (Homo) → Species (sapiens).
As we move down the list, the number of organisms in the group decreases and the similarity between members increases.
Q4What is binomial nomenclature? Who introduced it? Write the rules for writing scientific names.
Binomial nomenclature is the practice of giving every species a unique two-word Latin scientific name. It was introduced by the Swedish naturalist Carolus Linnaeus.
Rules: (i) The first word is the genus and is capitalised; (ii) the second word is the specific epithet and is in lowercase; (iii) both words are italicised in print, and underlined separately when handwritten; (iv) names are in Latin or Latinised. Example: Homo sapiens.
Q5Name the five kingdoms of Whittaker. State the criteria he used.
Five kingdoms (1969): Monera, Protista, Fungi, Plantae and Animalia.
Criteria: (i) Cell type — prokaryotic or eukaryotic; (ii) body organisation — unicellular or multicellular; (iii) mode of nutrition — autotrophic, heterotrophic or saprophytic.
Q6How are bacteria different from organisms in the four other kingdoms?
Bacteria belong to Kingdom Monera and are prokaryotic — their cells lack a true nucleus and membrane-bound organelles. All other kingdoms (Protista, Fungi, Plantae, Animalia) are eukaryotic. Bacteria are unicellular, microscopic, and have a cell wall made of peptidoglycan, not cellulose or chitin.
Q7Why are fungi placed in their own kingdom rather than with plants?
(i) Fungi lack chlorophyll, so they cannot photosynthesise; they are saprophytic, absorbing food from dead organic matter. (ii) Their cell walls contain chitin, not cellulose. (iii) They store food as glycogen, like animals, not as starch like plants. These differences justify a separate kingdom.
Q8Why are bryophytes called the "amphibians of the plant kingdom"?
Bryophytes (mosses, liverworts) live on land but require a film of water for the male gamete to swim across to the female gamete during sexual reproduction. Like amphibians, which live on land but breed in water, bryophytes too live on land but cannot complete reproduction without water — hence the nickname.
Q9Distinguish between Pteridophytes and Phanerogams.
Pteridophytes: have true root, stem, leaves and vascular tissue but reproduce by spores; do not produce seeds. Examples: Pteris, Marsilea.
Phanerogams: reproduce by seeds. They are further divided into Gymnosperms (naked seeds) and Angiosperms (seeds enclosed in fruit). Examples: Pinus, Mangifera indica.
Q10How do gymnosperms and angiosperms differ from each other?
Gymnosperms: bear seeds that are naked, lying on the scales of cones; do not produce flowers; mostly evergreen and woody. Example: Pinus, Cycas.
Angiosperms: bear seeds enclosed inside a fruit which develops from the ovary of a flower; produce true flowers; include both herbs and trees. Example: Mangifera indica, Oryza sativa.
Q11Differentiate between monocots and dicots in any four ways.
(i) Cotyledons: Monocots have one; dicots have two.
(ii) Leaf venation: Monocots show parallel veins; dicots show reticulate (net-like) venation.
(iii) Roots: Monocots have a fibrous root system; dicots have a tap root system.
(iv) Floral parts: Monocots have flowers in multiples of three; dicots in multiples of four or five.
Examples: monocot — wheat, maize; dicot — gram, mango.
Q12Why are sponges placed at the lowest level of the animal kingdom?
Sponges (Porifera) are the most primitive animals because (i) they have no true tissues, organs or organ systems — only a loose collection of cells; (ii) they show cellular grade of body organisation; (iii) they are sessile (fixed) and lack a nervous system. These are the simplest features in the animal kingdom.
Q13Why is Phylum Arthropoda the largest phylum in the animal kingdom? Give three features.
Arthropods make up nearly 80% of all known animal species. Three diagnostic features:
(i) Jointed appendages (legs and antennae) that allow precise movement.
(ii) A hard exoskeleton of chitin that protects the body and prevents water loss.
(iii) A segmented body, often divided into head, thorax and abdomen, with an open circulatory system. Examples: cockroach, butterfly, prawn, spider.
Q14Distinguish between reptiles and mammals giving any four points.
(i) Body covering: Reptiles have dry, scaly skin; mammals have hair or fur.
(ii) Heart: Reptiles have a 3-chambered heart (4 in crocodiles); mammals always have 4 chambers.
(iii) Body temperature: Reptiles are cold-blooded; mammals are warm-blooded.
(iv) Reproduction: Most reptiles lay shelled eggs (oviparous); most mammals give birth to live young (viviparous) and feed them with milk from mammary glands.
Q15Classify the following into their correct phylum/class with one reason each: (i) earthworm, (ii) sponge, (iii) starfish, (iv) frog, (v) snake, (vi) sparrow, (vii) bat, (viii) octopus, (ix) tapeworm, (x) cockroach.
(i) Earthworm — Annelida (segmented body).
(ii) Sponge — Porifera (porous body, no tissues).
(iii) Starfish — Echinodermata (spiny skin, water vascular system).
(iv) Frog — Chordata, Class Amphibia (moist skin, eggs in water, tadpole stage).
(v) Snake — Chordata, Class Reptilia (dry scales, lays shelled eggs on land).
(vi) Sparrow — Chordata, Class Aves (feathers, wings, beak, oviparous, warm-blooded).
(vii) Bat — Chordata, Class Mammalia (hair, mammary glands, viviparous, warm-blooded).
(viii) Octopus — Mollusca (soft body, foot modified into tentacles).
(ix) Tapeworm — Platyhelminthes (flat dorso-ventrally, parasitic).
(x) Cockroach — Arthropoda (jointed legs, chitin exoskeleton, segmented body).
Frequently Asked Questions — NCERT Exercises & Intext Questions
How do I solve NCERT Class 9 Science Chapter 12 (Patterns in Life: Diversity and Classification) exercise questions for the CBSE board exam?
Solve NCERT Chapter 12 — Patterns in Life: Diversity and Classification — exercise questions by first reading the question carefully, writing down the given data, recalling the relevant concepts like classification, taxonomy, binomial nomenclature, and applying them step by step. This Part 4 covers every intext and end-of-chapter exercise from the NCERT textbook. Write balanced equations, label diagrams clearly and show each step — CBSE Class 9 examiners award step marks even if the final answer has a small slip. Practising these solutions strengthens conceptual clarity and builds speed for both the school exam and the upcoming Class 10 board exam.
Are the NCERT intext questions from Patterns in Life: Diversity and Classification important for the Class 9 Science exam?
Yes, NCERT intext questions for Chapter 12 Patterns in Life: Diversity and Classification are highly important for the CBSE Class 9 Science exam. Many questions in school and competitive papers are directly lifted or only slightly modified from these intext questions, and they test the foundational concepts — classification, taxonomy, binomial nomenclature — that chapter-end questions and the Class 10 board build on. Attempt every intext question first, then move on to the exercises. This practice ensures complete NCERT coverage, which is the CBSE syllabus's primary source.
What types of questions from Patterns in Life: Diversity and Classification are asked in the Class 9 Science exam?
The Class 9 Science paper (CBSE pattern) asks a mix of question types from Patterns in Life: Diversity and Classification: 1-mark MCQ and assertion-reason, 2-mark short answers, 3-mark explanations, 5-mark long answers with diagrams or derivations, and 4-mark competency-based / case-study questions. These test understanding of classification, taxonomy, binomial nomenclature, plant kingdom. Practising every NCERT exercise and intext question prepares you to answer all of these formats with confidence.
How many marks does Chapter 12 — Patterns in Life: Diversity and Classification — typically carry in the Class 9 Science paper?
Chapter 12 — Patterns in Life: Diversity and Classification — is part of the CBSE Class 9 Science syllabus and typically contributes 5–9 marks in the annual paper, depending on the year's weightage. Questions are drawn from definitions, reasoning, numerical/descriptive problems and diagrams on topics like classification, taxonomy, binomial nomenclature. Solving the NCERT exercises in this part is essential because CBSE directly references the NCERT Exploration textbook for question design.
Where can I find step-by-step NCERT solutions for Chapter 12 Patterns in Life: Diversity and Classification Class 9 Science?
You can find complete, step-by-step NCERT solutions for Chapter 12 Patterns in Life: Diversity and Classification Class 9 Science on MyAiSchool. Every intext and end-of-chapter exercise question is solved with full working, labelled diagrams and CBSE-aligned mark distribution. Solutions highlight key points about classification, taxonomy, binomial nomenclature that examiners look for. This makes revision quick and exam-focused for Class 9 CBSE students.
What is the best way to revise Patterns in Life: Diversity and Classification for the Class 9 Science exam?
The best way to revise Patterns in Life: Diversity and Classification for the CBSE Class 9 Science exam is a three-pass approach. First pass: skim the chapter and note down key terms like classification, taxonomy, binomial nomenclature in a one-page mind map. Second pass: solve every NCERT intext and exercise question without looking at the solution, then self-check. Third pass: attempt sample papers and competency-based questions under timed conditions. This structured revision secures full marks for this chapter.
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