An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
Lignin
Cellulose
Cuticle
Sporopollenin
Additional Questions
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The coconut water and the edible part of coconut are equivalent to |
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The gynoecium consists of many free pistils in flowers of |
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In the fully organized polygonum type of embryo sac, what is the ratio of haploid, diploid and triploid nuclei? |
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Both, autogamy and geitonogamy are prevented in |
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Even in absence of pollinating agents seed-setting is assured in |
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Which type of association is found in between entomophilous flower and pollinating agent? |
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Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called |
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The process of fusion of male gamete with the polar nuclei is known as _____. |
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In which one of the following, male and female gametophytes do not have free living independent existence? |
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The tenuinucellate ovule has |
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