Sexual Reproduction in Flowering Plants — Important Questions
ICSE · Class 12 · Biology
104 important questions from Sexual Reproduction in Flowering Plants for ICSE Class 12 Biology, with answers. Written for the board exams 2027.
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Important Questions from Sexual Reproduction in Flowering Plants
How many cells are present in a mature embryo sac?
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7 cells
A mature embryo sac (Polygonum type) has 7 cells but 8 nuclei. The central cell has 2 polar nuclei, contributing 2 nuclei to the total of 8.
Double fertilisation occurs in gymnosperms.
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False
Double fertilisation is unique to angiosperms (flowering plants). It does not occur in gymnosperms.
Which structure develops from the ovule after fertilisation?
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Seed
After fertilisation, the ovule develops into the seed, and the ovary develops into the fruit (pericarp).
Sporopollenin is deposited on which layer of the pollen grain wall?
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Exine
Sporopollenin is deposited on the exine (outer layer) of the pollen wall via ubisch granules secreted by the tapetum. The intine is made of cellulose and pectin.
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