| How does endosperm of angiosperms become triploid? |
| OR |
| What is emasculation? Explain its importance in hybridisation. |
Answer:
Endosperm of angiosperms develops from the central cell of embryo sac where two polar nuclei fuse to form a secondary nucleus. This diploid nucleus of central cell fuses with one of the two male gametes. The two polar nuclei and one male gamete fuse to form a triploid primary endosperm nucleus (3n). Thus, the endosperm is formed from this triploid nucleus and becomes triploid.
OR
Emasculation is the practice of removal of anthers/stamens from the flower bud before the anther dehisces in a bisexual female flower.
It prevents contamination of stigmas with unwanted pollen grains that can be easily deposited on stigmas.
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