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GATE 2018 : Life Sciences [Section R / Botany] (with Final Answer Keys)

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GATE 2018 Botany (XL-R) XL-R: Q. 1 Q. 10 carry one mark each & Q. 11 Q. 20 carry two marks each. Q.1 Which of the following genera produces dimorphic seeds that help to broaden the time of germination in a variable habitat? (A) Xanthium Q.2 (B) Pisum (D) Linum The genes for microRNA (miRNA) in plants are usually transcribed by (A) RNA polymerase I (C) RNA polymerase III Q.3 (C) Mangifera (B) RNA polymerase II (D) RNA polymerase IV Which of the statements is TRUE for transposable elements Ac and Ds? (A) Both Ac and Ds are autonomous because they encode their own transposase (B) Both Ac and Ds are non-autonomous because they do not encode their own transposase (C) Only Ac is autonomous because it encodes its own transposase (D) Only Ds is autonomous because it encodes its own transposase Q.4 Identify the CORRECT statement. (A) Receptor-like kinases play role in gametophytic self-incompatibility in Brassicaceae (B) Receptor-like kinases play role in sporophytic self-incompatibility in Solanaceae (C) Ribonucleases play role in sporophytic self-incompatibility in Brassicaceae (D) Ribonucleases play role in gametophytic self-incompatibility in Solanaceae Q.5 Which of the following statements is TRUE for an ecotone? (A) An ecotone is the synonym of an ecosystem (B) An ecotone is an interface zone of two or more ecosystems (C) An ecotone is a special feature of land biomes (D) An ecotone is exclusively characterized by decreased biodiversity Q.6 Acid rain with a pH of 4.0 is more acidic than the rain with a pH of 6.0 by (A) 2 times Q.7 (B) 10 times (D) 1000 times Which of the following plants produces Ylang-ylang oil? (A) Cananga odorata (C) Pandanus odoratissimus Q.8 (C) 100 times (B) Carcum copticum (D) Pimenta racemosa Identify the INCORRECT statement in connection with polar transport of auxin. (A) The putative influx carrier AUX1 is a cytosolic protein (B) Polar auxin transport in root tends to be both acropetal and basipetal in direction (C) Naphthylphthalamic acid (NPA) is an inhibitor of polar auxin transport (D) AUX1 and PIN1 proteins are located in the opposite ends of a cell for polar transport XL-R 1/4

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