Class 9th Biology: Diversity in Living Organisms (Complete Quiz, Exemplar & Solutions)

Class 9th Biology

Diversity in Living Organisms (Complete Practice Quiz & Solutions)

Class 9th Biology: Diversity in Living Organisms (Complete Quiz, Exemplar & Solutions)

Part A: NCERT Exemplar Questions

Q1 (Exemplar). Find out the incorrect sentence:
(गलत कथन पहचानिए:)

💡 Explanation: Monerans are prokaryotic organisms and lack a well-defined membrane-bound nucleus[cite: 7].

Q2 (Exemplar). Which among the following has specialised tissue for conduction of water?
(i) Thallophyta    (ii) Bryophyta    (iii) Pteridophyta    (iv) Gymnosperms

💡 Explanation: Vascular tissue (xylem/phloem) is present in Pteridophytes and Gymnosperms, but absent in Thallophytes and Bryophytes[cite: 7].

Q3 (Exemplar). Which among the following produce seeds?
(निम्नलिखित में से कौन बीज उत्पन्न करते हैं?)

💡 Explanation: Gymnosperms and Angiosperms are phanerogams that produce seeds[cite: 7].

Q4 (Exemplar). Which one is a true fish?
(निम्नलिखित में से कौन सी एक वास्तविक मछली है?)

💡 Explanation: Dogfish (Scoliodon) belongs to Pisces, whereas Jellyfish (Cnidaria), Starfish (Echinodermata), and Silverfish (Arthropoda) are non-chordates[cite: 7].

Q5 (Exemplar). Which among the following is exclusively marine?
(निम्नलिखित में से कौन केवल समुद्री (marine) जीव हैं?)

💡 Explanation: Echinoderms are exclusively marine animals with a water-vascular system[cite: 7].

Q6 (Exemplar). Which among the following have open circulatory system?
(i) Arthropoda    (ii) Mollusca    (iii) Annelida    (iv) Coelenterata

💡 Explanation: Arthropods and Molluscs have open circulatory systems where blood flows into open coelomic cavities[cite: 7].

Q7 (Exemplar). In which group of animals, coelom is filled with blood?
(किस जीव समूह में देहगुहा (coelom) रुधिर से भरी होती है?)

💡 Explanation: In Arthropoda, the body cavity is a hemocoel filled with blood[cite: 7].

Q8 (Exemplar). Elephantiasis is caused by:
(फीलपांव/हाथीपांव रोग किसके द्वारा होता है?)

💡 Explanation: Elephantiasis (filariasis) is caused by the filarial worm Wuchereria bancrofti[cite: 7].

Q9 (Exemplar). Which one is the most striking or common character of vertebrates?
(कशेरुकियों का सबसे प्रमुख/सामान्य लक्षण कौन सा है?)

💡 Explanation: Presence of a dorsal notochord/vertebral column is the defining vertebrate trait[cite: 7].

Q10 (Exemplar). Which among the following have scales?
(i) Amphibians    (ii) Pisces    (iii) Reptiles    (iv) Mammals

💡 Explanation: Fishes (Pisces) and Reptiles possess protective dermal scales[cite: 7].

Q11 (Exemplar). Find out the false statement:
(असत्य कथन चुनें:)

💡 Explanation: According to key standard classification[cite: 7].

Q12 (Exemplar). Identify a member of Porifera:
(पोरिफेरा (Porifera) के सदस्य को पहचानें:)

💡 Explanation: Spongilla is a freshwater sponge belonging to Porifera[cite: 7].

Q13 (Exemplar). Amphibians do not have:
(उभयचरों (Amphibians) में अनुपस्थित होता है:)

💡 Explanation: Amphibians have smooth, moist, scaleless skin containing mucus glands[cite: 7].

Q14 (Exemplar). Organisms without nucleus and cell organelles belong to:
(i) fungi    (ii) protista    (iii) cyanobacteria    (iv) archaebacteria

💡 Explanation: Cyanobacteria and Archaebacteria are prokaryotes belonging to Monera, lacking membrane-bound organelles[cite: 7].

Q15 (Exemplar). Which of the following is NOT a criterion for classification of living organisms?
(सजीवों के वर्गीकरण का मापदंड क्या नहीं है?)

💡 Explanation: Plant height varies environmentally and is not a fundamental taxonomic criterion[cite: 7].

Q16 (Exemplar). Feature that is NOT a characteristic of Protochordata?

💡 Explanation: Jointed legs are unique to phylum Arthropoda[cite: 7].

Q17 (Exemplar). The locomotory organs of Echinodermata are:

💡 Explanation: Echinoderms use hydraulic tube feet driven by a water-vascular system[cite: 7].

Q18 (Exemplar). Corals are:

💡 Explanation: Corals are colonial coelenterates (cnidarians) secreting hard calcium carbonate skeletons[cite: 7].

Q19 (Exemplar). Who introduced the system of scientific nomenclature of organisms?

💡 Explanation: Carolus Linnaeus introduced binomial nomenclature[cite: 7].

Q20 (Exemplar). Two-chambered heart occurs in:

💡 Explanation: Fishes have a 2-chambered heart (one atrium, one ventricle)[cite: 7].

Q21 (Exemplar). Skeleton is made entirely of cartilage in:

💡 Explanation: Sharks are cartilaginous fish (Chondrichthyes)[cite: 7].

Q22 (Exemplar). One of the following is NOT an Annelid:

💡 Explanation: Sea urchins belong to phylum Echinodermata[cite: 7].

Q23 (Exemplar). Carl Von Linne was involved with which branch of science?

💡 Explanation: Linnaeus is known as the Father of Taxonomy[cite: 7].

Q24 (Exemplar). Real organs are absent in:

💡 Explanation: Coelenterates exhibit tissue-level organization without true organs[cite: 7].

Q25 (Exemplar). Hard calcium carbonate structures are used as skeleton by:

💡 Explanation: Echinoderms have an endoskeleton of calcareous ossicles[cite: 7].

Q26 (Exemplar). Differentiation in segmental fashion occurs in:

💡 Explanation: Leeches belong to Annelida, characterized by true metameric segmentation[cite: 7].

Q27 (Exemplar). Five kingdom classification was proposed by:

💡 Explanation: R.H. Whittaker proposed the 5-kingdom system in 1969[cite: 7].

Q28 (Exemplar). Well-defined nucleus is absent in:

💡 Explanation: Blue-green algae (cyanobacteria) are prokaryotes[cite: 7].

Q29 (Exemplar). 'The Origin of Species' was written by:

💡 Explanation: Charles Darwin published 'The Origin of Species' in 1859[cite: 7].

Q30 (Exemplar). Feature confirming that an animal observed in garden is an insect:

💡 Explanation: Jointed appendages/legs are characteristic of Arthropods (insects)[cite: 7].

Q31 (Exemplar). In taxonomic hierarchy, Family comes between:

💡 Explanation: Order → Family → Genus[cite: 7].

Q32 (Exemplar). The book 'Systema Naturae' was written by:

💡 Explanation: Carolus Linnaeus authored 'Systema Naturae'[cite: 7].

Q33 (Exemplar). Which is NOT an aquatic animal?

💡 Explanation: Filaria (Wuchereria) is an endoparasite living inside human lymphatic systems[cite: 7].

Q34 (Exemplar). Pteridophyta do not have:

💡 Explanation: Pteridophytes are seedless, flowerless cryptogams[cite: 7].

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Part B: Very Short Concept Questions

V1. What is meant by term 'diversity'?

💡 Answer: Diversity refers to the wide variety of living beings, including plants, animals, and microorganisms on Earth[cite: 7].

V2. What is Linnaean hierarchy?

💡 Answer: It is the arrangement of taxonomic categories in increasing/decreasing order, developed by Carolus Linnaeus[cite: 7].

V3. What is the basic unit of classification?

💡 Answer: Species[cite: 7].

V4. Which is the highest taxonomic category?

💡 Answer: Kingdom[cite: 7].

V5. What is a species?

💡 Answer: A group of similar organisms capable of interbreeding under natural conditions to produce fertile offspring[cite: 7].

V6. Who proposed 5-kingdom classification?

💡 Answer: Robert H. Whittaker (1969)[cite: 7].

V7. What is the most important feature of Monera?

💡 Answer: All Monerans are prokaryotic organisms lacking nuclear membranes[cite: 7].

V8. What is the most important feature of Protista?

💡 Answer: Protista consists of unicellular eukaryotic organisms[cite: 7].

V9. What is a thallus?

💡 Answer: A plant body not differentiated into root, stem, and leaves[cite: 7].

V10. What is mycelium?

💡 Answer: The network mass of intermeshed fungal threads (hyphae)[cite: 7].

V11. What are autotrophs?

💡 Answer: Organisms that synthesize their own food using simple inorganic raw materials (e.g., green plants)[cite: 7].

V12. What are heterotrophs?

💡 Answer: Organisms dependent on other organisms for nutrition[cite: 7].

V13. Give two examples of heterotrophs.

💡 Answer: Animals and Fungi[cite: 7].

V14. What are animals?

💡 Answer: Multicellular eukaryotic heterotrophs lacking cell walls[cite: 7].

V15. What is Thallophyta?

💡 Answer: A plant division containing simple, non-differentiated organisms like algae[cite: 7].

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Part C: Assertion and Reason Questions

Directions:
(a) Both A and R are true and R is correct explanation of A.
(b) Both A and R are true but R is NOT correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q1 (A/R).
Assertion (A): Biodiversity refers to wide variety of living organisms on earth.
Reason (R): Biodiversity includes genetic diversity among individuals of species.

💡 Explanation: Both statements are true facts defining scope[cite: 7].

Q2 (A/R).
Assertion (A): Classification makes the study of different organisms convenient.
Reason (R): Biological classification reveals evolutionary trends and increasing structural complexity.

💡 Explanation: Evolutionary relationships facilitate systemized study[cite: 7].

Q3 (A/R).
Assertion (A): Bacteria are simple primitive organisms.
Reason (R): They are multicellular and have rigid cell wall.

💡 Explanation: Reason is false because bacteria are UNICELLULAR prokaryotes[cite: 7].

Q4 (A/R).
Assertion (A): All organisms of kingdom Monera are prokaryotes.
Reason (R): Mode of nutrition in this group is autotrophic only.

💡 Explanation: Monerans can be autotrophic OR heterotrophic[cite: 7].

Q5 (A/R).
Assertion (A): Thallophyta contains mainly algae.
Reason (R): Body is not differentiated into stem, roots, and leaves.

💡 Explanation: Undifferentiated thallus structure defines thallophytes[cite: 7].

Q6 (A/R).
Assertion (A): Bryophytes are called amphibians of Plant Kingdom.
Reason (R): They possess stem/leaf-like structures and rhizoids.

💡 Explanation: Bryophytes need water for fertilization despite living on land[cite: 7].

Q7 (A/R).
Assertion (A): Gymnosperms possess naked seeds.
Reason (R): Absence of vessels in xylem and companion cells in phloem.

💡 Explanation: Naked seeds result from unenclosed ovules (absence of ovary/fruit), not vascular cellular features[cite: 7].

Q8 (A/R).
Assertion (A): Parazoa consists of loosely aggregated porous cellular bodies.
Reason (R): Body is perforated communicating with water canal system.

💡 Explanation: Porifera (sponges) exhibit cellular grade organization with ostia canal systems[cite: 7].

Q9 (A/R).
Assertion (A): Hydra is a multicellular diploblastic organism.
Reason (R): Derived from ectoderm and endoderm (mesoglea non-cellular).

💡 Explanation: Diploblastic organisms develop two embryonic germ layers[cite: 7].

Q10 (A/R).
Assertion (A): Body of Aschelminthes is radially symmetrical.
Reason (R): Members are called roundworms.

💡 Explanation: Assertion is false because Aschelminthes are BILATERALLY symmetrical[cite: 7].

Q11 (A/R).
Assertion (A): Coelom is the cavity inside body holding organs.
Reason (R): True coelom appeared first in Annelids.

💡 Explanation: Both are correct individual zoological facts[cite: 7].

Q12 (A/R).
Assertion (A): Animals with three germ layers are called triploblastic.
Reason (R): Animals of Cnidaria are multicellular and triploblastic.

💡 Explanation: Reason is false because Cnidarians are DIPLOBLASTIC[cite: 7].

Q13 (A/R).
Assertion (A): Amphibians have gills as well as lungs.
Reason (R): First animals to adapt to land.

💡 Explanation: Dual life habitats demand aquatic gills and terrestrial lungs[cite: 7].

Q14 (A/R).
Assertion (A): Whales are not grouped with fishes.
Reason (R): Whales breathe with lungs, have 4-chambered heart and mammary glands.

💡 Explanation: Whales are mammals because of mammary glands, lungs, and warm blood[cite: 7].

Q15 (A/R).
Assertion (A): Euglena has characteristics of plants and animals.
Reason (R): Possesses flagellum, lacks cell wall, has chloroplasts.

💡 Explanation: Mixotrophic Euglena combines plant chloroplasts with animal flagellar motility[cite: 7].

Q16 (A/R).
Assertion (A): Frogs lay eggs outside the water.
Reason (R): They are amphibians.

💡 Explanation: Assertion is false because frogs lay unshelled eggs IN WATER[cite: 7].

Q17 (A/R).
Assertion (A): Flying lizard (Draco) belongs to Aves.
Reason (R): It is cold-blooded, covered with scales, 3-chambered heart.

💡 Explanation: Assertion is false because flying lizard belongs to REPTILIA[cite: 7].

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Part D: Objective Practice MCQs

Q1. Binomial nomenclature consists of two names:

💡 Explanation: Generic name + Specific epithet[cite: 7].

Q2. The father of taxonomy is:

💡 Explanation: Carolus Linnaeus[cite: 7].

Q3. Who introduced binomial nomenclature?

💡 Explanation: Linnaeus[cite: 7].

Q4. Mycoplasma is placed in:

💡 Explanation: Mycoplasma are wall-less prokaryotes in Monera[cite: 7].

Q5. In five kingdom classification, Amoeba is placed in:

💡 Explanation: Amoeba is a unicellular eukaryote (Protista)[cite: 7].

Q6. Fungi are characterized by:

💡 Explanation: Chitinous cell wall without photosynthetic chlorophyll[cite: 7].

Q7. Blue green algae is not placed with other algae because:

💡 Explanation: Cyanobacteria are prokaryotic monerans[cite: 7].

Q8. Which taxon contains the most closely related organisms?

💡 Explanation: Genus is lowest among choices[cite: 7].

Q9. Animals are characterized by:

💡 Explanation: All listed traits define Animalia[cite: 7].

Q10. Which type of ribosomes are found in bacteria?

💡 Explanation: Prokaryotes contain 70S ribosomes[cite: 7].

Q11. Which rRNA is common in eukaryotes and prokaryotes?

💡 Explanation: 5S rRNA is conserved in ribosome large subunits of both[cite: 7].

Q12. PPLO belongs to:

💡 Explanation: PPLO = Pleuropneumonia-like organisms (Mycoplasma)[cite: 7].

Q13. Ingestive mode of nutrition is found in:

💡 Explanation: Holozoic ingestion in Animalia[cite: 7].

Q14. Term 'species' was coined by:

💡 Explanation: John Ray coined species term[cite: 7].

Q15. Canal system is the key feature of:

💡 Explanation: Sponges (Porifera) have ostia water canal system[cite: 7].

Q16. Stinging cells (cnidoblasts) are found in:

💡 Explanation: Cnidocytes/stinging cells in Cnidarians[cite: 7].

Q17. Cockroach belongs to phylum:

💡 Explanation: Jointed leg insect in Arthropoda[cite: 7].

Q18. Chordates are characterized by:

💡 Explanation: Triad of chordate features[cite: 7].

Q19. Which of these is a true fish?

💡 Explanation: True Pisces member[cite: 7].

Q20. Pseudocoelom is found in:

💡 Explanation: Nematodes (Ascaris/Roundworm) have false coelom[cite: 7].

Q21. Paramecium and Amoeba belong to:

💡 Explanation: Unicellular protozoans[cite: 7].

Q22. Flowering plants belong to which group?

💡 Explanation: Angiosperms are covered-seed flowering plants[cite: 7].

Q23. Ferns are placed in which group?

💡 Explanation: Ferns are vascular cryptogams in Pteridophyta[cite: 7].

Q24. Scientific name of Indian frog is:

💡 Explanation: Rana tigrina[cite: 7].

Q25. What components make up a virus?

💡 Explanation: Nucleocapsid (DNA/RNA + Capsid)[cite: 7].

Q26. Which of these is an air pollution indicator?

💡 Explanation: Lichens are sensitive to SO₂ air pollution[cite: 7].

Q27. Microbes like Rhizobium, Nitrosomonas are used for:

💡 Explanation: Biological nitrogen fixation and nitrification[cite: 7].

Q28. Common occupation among many traditional tribal communities in India:

💡 Explanation: Sustainable harvesting of non-timber forest produce[cite: 7].

Q29. Which new kingdom was added in 3-kingdom classification?

💡 Explanation: Ernst Haeckel added Protista[cite: 7].

Q30. Example of ecological service provided by species:

💡 Explanation: Ecosystem services rendered by biodiversity[cite: 7].