Diversity in Living World
- Which one of the following is the characteristic feature of gymnosperms? Answer: 2. Seeds are naked. Key idea: Gymnos means naked. In gymnosperms the ovules are not enclosed in an ovary, so the seeds are naked. Fr... 1
- Match List I with List II.List I: A. Pteridophyte B. Bryophyte C. Angiosperm D. GymnospermList II: I. Salvia II. Ginkgo III. Polytrichum IV. SalviniaChoose the option with all correct matches. Answer: 2. A-IV, B-III, C-I, D-II Key idea: Identify each plant group. Pteridophyte: Salvinia (A-IV). Bryophyte: Polytrichum, a moss (B-III)... 1
- In bryophytes, the gemmae help in which one of the following? Answer: 2. Asexual reproduction Key idea: Gemmae are green multicellular buds in cups on the thallus of liverworts such as Marchantia. They... 1
- Each of the following characteristics represent a Kingdom proposed by Whittaker. Arrange the following in increasing order of complexity of body organization.A. Multicellular heterotrophs with cell wall made of chitin.B. Heterotrophs with tissue/orga… Answer: 2. C, E, A, D, B Key idea: Order by increasing body complexity across Whittaker's kingdoms. C: Monera, prokaryotes E: Protista, euka... 1
- The correct sequence of events in the life cycle of bryophytes isA. Fusion of antherozoid with egg.B. Attachment of gametophyte to substratum.C. Reduction division to produce haploid spores.D. Formation of sporophyte.E. Release of antherozoids into w… Answer: 3. B, E, A, D, C Key idea: In bryophytes, the gametophyte is dominant and the sporophyte depends on it. B: gametophyte attaches to t... 1
- Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.A. Prothallus stageB. Meiosis in spore mother cellsC. FertilisationD. Formation of archegonia and antheridia in gametophyte.E. Transfe… Answer: 1. B, A, D, E, C Key idea: In pteridophytes the dominant sporophyte makes spores by meiosis, which grow into the gametophyte. B: mei... 1
- Which one of the following statements refers to Reductionist Biology? Answer: 1. Physico-chemical approach to study and understand living organisms. Key idea: Reductionist biology explains living organisms by s... 1
- Read the following statements and choose the set of correct statements:In the members of Phaeophyceae,A. Asexual reproduction occurs usually by biflagellate zoospores.B. Sexual reproduction is by oogamous method only.C. Stored food is in the form of… Answer: 4. A, C, D and E only Key idea: check each statement about brown algae. A true: asexual reproduction by biflagellate zoospores. B fa... 1
- Match List I with List IIList I: A. Rhizopus; B. Ustilago; C. Puccinia; D. AgaricusList II: I. Mushroom; II. Smut fungus; III. Bread mould; IV. Rust fungusChoose the correct answer from the options given below: Answer: 2. A-III, B-II, C-IV, D-I Key idea: match the fungus with its common name or disease. Rhizopus: bread mould (III) Ustilago: smut fun... 1
- Which one of the following is not a criterion for classification of fungi? Answer: 3. Mode of nutrition Key idea: fungi are classified on morphology of mycelium, mode of spore formation and fruiting bodies. All fung... 1
- Identify the pair of heterosporous pteridophytes among the following : Answer: 3. Selaginella and Salvinia Key idea: Heterosporous pteridophytes make two kinds of spores (micro and megaspores). Selaginella and S... 1
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.Reason R : Air currents carry the… Answer: 4. A is true but R is false. Key idea: In gymnosperms the pollen grains are carried by air currents, but they do form a pollen tube.... 1
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : The first stage of gametophyte in the life cycle of moss is protonema stage.Reason R : Protonema develops directly from spores produc… Answer: 2. Both A and R are correct and R is the correct explanation of A. Key idea: In mosses the haploid spore germinates into a creeping,... 1
- Which of the following is a correct statement ? Answer: 2. Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera. Key idea: Cyanobacteria are autotrophic and b... 1
- Given below are two statements :Statement I :Mycoplasma can pass through less than 1 micron filter size.Statement II :Mycoplasma are bacteria with cell wallIn the light of the above statements, choose the most appropriate answer from the options give… Answer: 4. Statement I is correct but Statement II is incorrect Key idea: Mycoplasma are the smallest bacteria and have no cell wall. Statem... 1
- In the taxonomic categories which hierarchial arrangement in ascending order is correct in case of animals ? Answer: 2. Kingdom, Phylum, Class, Order, Family, Genus, Species Key idea: The standard hierarchy is Kingdom, Phylum, Class, Order, Family,... 1
- Identify the asexual reproductive structure associated with Penicillium : Answer: 3. Conidia Key idea: Penicillium is a fungus that reproduces asexually by conidia. Conidia are borne on conidiophores, so option 3 i... 1
- Match the plant with the kind of life cycle it exhibits :List - I: (a) Spirogyra (b) Fern (c) Funaria (d) CycasList - II: (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living… Answer: 3. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) Spirogyra: dominant haploid free-living gametophyte, (ii). Fern: dominant diploid... 1
- Which of the following is incorrectly matched ? Answer: 3. Ulothrix - Mannitol Green algae like Ulothrix store starch, not mannitol. Mannitol is the reserve food in brown algae. Other pair... 1
- Hydrocolloid carrageen is obtained from : Answer: 4. Rhodophyceae only Carrageen is a hydrocolloid obtained from red algae (Rhodophyceae), such as Chondrus. Brown algae (Phaeophyceae... 1
- Which of the following statements is correct ? Answer: 2. Fusion of protoplasms between two motile on non-motile gametes is called plasmogamy. Check each statement. Fusion of two cells is... 1
- Which of the following algae produce Carrageen ? Answer: 3. Red algae Carrageen is a hydrocolloid obtained from the cell walls of red algae (for example Chondrus). Brown algae give algin, a... 1
- Which of the following plants is monoecious ? Answer: 2. Chara A monoecious plant bears male and female reproductive organs on the same plant. Chara is monoecious. Papaya, Marchantia pol... 1
- Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as : Answer: 4. Heterosporous Plants that produce two kinds of spores, small microspores and large megaspores, are heterosporous. Selaginella and... 1