Asexual and Sexual Reproduction in Plants — BIO BOTANY STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12BIO BOTANYAsexual and Sexual Reproduction in Plants3 Marks
Question
Write a short note on endosperm.
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Answer
The primary endosperm nucleus (PEN) divides immediately after fertilization but before 1 the zygote starts to divide, into an endosperm. The primary endosperm nucleus is the result of triple fusion (two polar nuclei and one sperm nucleus) and thus has 3n number of chromosomes. It is a nutritive tissue and regulatory structure that nourishes the developing embryo. Depending upon the mode of development three types of endosperm are recognized in angiosperms. They are nuclear endosperm, cellular endosperm and helobial endosperm.
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