Diversity in Living World
- Which of the following algae contains mannitol as reserve food material ? Answer: 1. Ectocarpus Ectocarpus is a brown alga. Brown algae store food as laminarin and mannitol. Gracilaria is red (floridean starch), wh... 1
- Gemmae are present in : Answer: 4. Some Liverworts Gemmae are small green multicellular buds that form in gemma cups on the thallus. They are a means of asexual rep... 1
- Which of the following is correct about viroids ? Answer: 2. They have free RNA without protein coat. Viroids are free RNA molecules without a protein coat, and are smaller than viruses. The... 1
- Floridean starch has structure similar to : Answer: 2. Amylopectin and glycogen Floridean starch, the food reserve of red algae, is structurally like amylopectin and glycogen. All thre... 1
- Which of the following pairs is of unicellular algae ? Answer: 4. Chlorella and Spirulina Chlorella and Spirulina are unicellular and are used as single-cell protein. Laminaria, Sargassum, Gelidi... 1
- Strobili or cones are found in : Answer: 4. Equisetum Strobili (cones) are found in Equisetum, a pteridophyte with sporophylls in cones. Salvinia and Pteris have sori or spo... 1
- Which of the following statements is incorrect ? Answer: 3. Infective constituent in viruses is the protein coat. Key idea: In viruses, the infective part is the nucleic acid (genome), not... 1
- Which of the following statements is incorrect ? Answer: 4. Yeasts have filamentous bodies with long thread-like hyphae. Key idea: Yeasts are unicellular, not filamentous. Morels and truffl... 1
- Match Column - I with Column - II.Column - I | Column - II(a) Saprophyte | (i) Symbiotic association of fungi with plant roots(b) Parasite | (ii) Decomposition of dead organic materials(c) Lichens | (iii) Living on living plants or animals(d) Mycorrh… Answer: 4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i) Key idea: Match nutrition modes with their meaning. Saprophyte: decomposes dead organic ma... 1
- Pinus seed cannot germinate and establish without fungal association. This is because : Answer: 2. it has obligate association with mycorrhizae. Key idea: Pinus roots have an obligate mycorrhizal association. The fungus helps ab... 1
- From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in : Answer: 3. Pteridophytes Key idea: Retention of the female gametophyte with the young embryo on the sporophyte appears first in pteridophyte... 1
- Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus : Answer: 2. textitMangifera indica Linn. Key idea: In a scientific name the genus starts with a capital letter, the species with a small lett... 1
- Which of the following organisms are known as chief producers in the oceans ? Answer: 3. Diatoms Key idea: Diatoms are the chief producers in the oceans. These are abundant photosynthetic protists (golden-brown algae)... 1
- Ciliates differ from all other protozoans in Answer: 4. having two types of nuclei Key idea: Ciliated protozoans such as Paramecium have two types of nuclei: a large macronucleus and on... 1
- After karyogamy followed by meiosis, spores are produced exogenously in Answer: 2. *Agaricus* In basidiomycetes such as Agaricus, karyogamy and meiosis occur in the basidium, giving basidiospores borne exogenousl... 1
- Winged pollen grains are present in Answer: 4. *Pinus* Pinus pollen grains have two air bladders (wings), helping wind dispersal. Mustard and mango are insect pollinated, and C... 1
- Which one is *wrongly* matched ? Answer: 1. Uniflagellate gametes – *Polysiphonia* Polysiphonia is a red alga with no flagellated stage; its gametes are non-motile. Gemma cu... 1
- Match the items given in Column I with those in Column II and select the *correct* option given below :Column I | Column IIa. Herbarium | i. It is a place having a collection of preserved plants and animals.b. Key | ii. A list that enumerates methodi… Answer: 4. a-iii, b-iv, c-i, d-ii Match each term with its definition. Herbarium: dried, pressed plants on sheets (iii). Key: list of charac... 1
- Select the *wrong* statement : Answer: 2. Pseudopodia are locomotory and feeding structures in Sporozoans. Sporozoans (e.g. Plasmodium) have no locomotory organs, so the s... 1
- Which among the following is *not* a prokaryote ? Answer: 1. *Saccharomyces* Saccharomyces is yeast, a unicellular fungus, so it is a eukaryote. Nostoc and Oscillatoria are cyanobacteria and... 1
- Which of the following statements is *correct* ? Answer: 1. Ovules are not enclosed by ovary wall in gymnosperms. Gymnosperms are 'naked-seeded' plants, so their ovules lie exposed and are... 1
- Zygotic meiosis is characteristic of : Answer: 3. textitChlamydomonas In zygotic meiosis the zygote divides by meiosis first, so the plant body is haploid. This is the haplontic l... 1
- Select the mismatch : Answer: 4. textitPinus - Dioecious The mismatch is Pinus - dioecious. Pinus is monoecious: male and female cones are on the same tree. Cycas... 1
- Viroids differ from viruses in having : Answer: 3. RNA molecules without protein coat Viroids are smaller than viruses: they are infectious RNA molecules and have no protein coat.... 1