nucellus मीनिंग इन हिंदी

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The nucellus ( central portion of the ovule ) only at the base.
Located opposite from the micropyle is the chalaza where the nucellus is joined to the integuments.
A pollen tube is produced, which grows into the nucellus to provide nutrients for the developing sperm cells.
As with all seed-plants, the lyginopteridalean ovules had just one functional seed megaspore within the nucellus.
After fertilization, the nucellus may develop into the "'perisperm "'that feeds the embryo.
The integuments do not enclose the nucellus completely but retain an opening at the apex referred to as the "'micropyle " '.
However, they fall short of being ovules, since the nucellus, an inner spore-covering layer, does not completely enclose the spore.
In some plants, the diploid tissue of the nucellus can give rise to the embryo within the seed through a mechanism of asexual reproduction called nucellar embryony.
Originally, by analogy with the animal ovum, the outer nucellus layer ( perisperm ) was referred to as albumen, and the inner endosperm layer as vitellus.
Beneath the sarcotesta is the hard sclerotesta ( the " shell " of the seed ) and a papery endotesta, with the nucellus surrounding the female gametophyte at the center.

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