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Biology
Sexual Reproduction in Flowering Plants
126 questions from 36 papers, each with its answer.
- 126 questions
- 36 papers
- 3.57% of Biology
Agents of Pollination
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Assertion (A): Both wind and water pollinated flowers are not very colourful and do not produce nectar.Reason (R): The flowers produce enormous amount of pollen grains in wind and water pollinated flowers.
Both statements are true facts of abiotic pollination, but Reason does not explain why they lack colour/nectar (lack of biotic pollinators is the cause).
Wind and water pollinated flowers do not need visual cues or rewards like nectar because their vectors are abiotic, making Assertion true. They produce copious pollen to compensate for random passive dispersal loss, making Reason true. However, R is not the explanation for A.
Microsporangium and Tapetum
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Assertion (A): Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.Reason (R): Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells.
Assertion is true; Reason is false (tapetum nourishes developing microspores / pollen grains, and polyploidy arises due to endomitosis without cytokinesis, not MMC nourishment efficiency).
Tapetal cells feature dense cytoplasm and multinucleate or polyploid state due to endomitosis. Tapetum primarily functions to nourish developing microspores/pollen grains. Stating that multinucleation specifically evolved to nourish microspore mother cells is incorrect.
That is every question in Sexual Reproduction in Flowering Plants for this filter.
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