Question

Generally nucellus does not persist in mature seeds. Cite two examples which show persistence of nucellus in the seed and what name is given to the persistent nucellulus ?

Answer 1

Answer:

Wheat, maize, barley, castor and sunflower show persistent nucellus. Perisperm is the term given.

Answer 2

Generally nucellus does not persist in mature seeds. Two examples which show persistence of nucellus in the seed and name is given to the persistent nucellulus is perisperm

Explanation:

• Wheat, maize, barley, castor and sunflower show persistent nucellus. The layer of nutritive tissue, derived from the nucellus, that surrounds the embryo of a seed in some angiosperms.
• The remains of nucellus left after the fertilization and absorption by the endosperm and embryo is known as perisperm.
• Seeds which contain perisperm are known as perispermic seed. Perisperm is remnants of nucellus which is diploid (2n) but endosperm is triploid (3n).
• In angiosperms the endosperm is formed as a result of vegetative fertilization, triple fusion or fusion of a male gamete with diploid secondary nucleus of the central cell.

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