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What is pollen sac and its function?

Important Questions on Reproduction in Lower and Higher Plants

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Biology>Reproduction>Reproduction in Lower and Higher Plants>Sexual Reproduction in Plants
Which is the most common mechanism of genetic variation in the population of sexually-reproducing organism?
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Which one of the following statements is not true?
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In Angiosperms, microsporogenesis and megasporogenesis:
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The ovule of an angiosperm is technically equivalent to
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Choose the correct/most appropriate answer out of the four alternatives given against each item and write it in your answer book:
'Pollen grains' are produced by:
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The hilum is a scar on the:
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Male gametophyte in angiosperms produces :
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Which one of the following is NOT a mode of asexual reproduction?
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Pollen grains are produced by
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Pollen grain of a plant (2n = 28) are cultured to produce callus tissues by tissue culture methods. What would be the chromosome number in the cells of callus?
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Which one of the following generates new genetic combinations leading to variation?
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In a complete flower, identify the following:
(a) Part that produces pollen grain -
(b) Part that transfers male gametes to the female gametes -
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In the majority of angiosperms:
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Which one of the following statements is not true?
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The hard outer layer of pollens, named exine, is made of
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Pollen tablets are available in the market for:
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Functional megaspore in an angiosperm develops into:
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Which of the following is the correct option for the figure given below?

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Biology>Reproduction>Reproduction in Lower and Higher Plants>Sexual Reproduction in Plants

Draw the diagram showing the longitudinal section of a flower. Label the following parts:

i) Style

ii) Anther

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Consider the following statements & choose the correct answer from the given options.

Statement 1: Innermost layer of microsporangium is tapetum.

Statement 2: Cells of tapetum possess dense cytoplasm with more than one nucleus and nourishes developing pollen grains.