Wind pollinated flowers are
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(a) small, brightly coloured, producing large number of pollen grains (b) small, producing large number of dry pollen grains (c) large producing abundant nectar and pollen (d) small, […]
Which one of the following statements is wrong?
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(a) When pollen is shed at two-celled stage, doubled fertiliztion does not take place (b) Vegetative cell is larger thean generative cell (c) Pollen […]
Which one of the following statements is correct?
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(a) Geitonogamy involves the pollen and stigma of flowers of different plants (b) Clestogamous flowers are always autogamous (c) Xenogamy occurs only by wind […]
What does the filiform apparatus do at the entrace into ovule?
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(a) It helps in the entry of pollen tube into a synergid (b) It prevents entry of more than one poller […]
Which of the following statements about Sporopollenin is correct?
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(a) Sporopollenin can withstand high temperatures but not strong acids (b) Sporopollenin can be degraded by enzymes (c) Sporopollenin is made up of […]
Which one of the following statements is not true about somatic embryogenesis?
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(a) A somatic embryo develops from a somatic cell (b) The pattern of development of a somatic embryo is comparable […]
Which one of the following statements is correct?
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(a) sporogenous tissue is haploid (b) Endothecium produces the microspores (c) Tapetum nourishes the developing pollen (d) Hard outer layer of pollen is called […]
Which one of the following pairs of plant structures has haploid number of chromosomes?
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(a) Megaspore mother cell and antipodal cells (b) Egg cell and antipodal cells (c) Nucleus and antipodal cells […]
The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because:
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(a) high energy bonds are formed in mitochondrial proteins. (b) ADP is pumped out of the matrix into […]
All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is
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(a) isocitrate dehydrogenase […]
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