What is endosperm? explain cellular endosperm with example?
Answers
Answer:
Explanation:
The endosperm makes the main source of food for the embryo. In gymnosperms, the endosperm is haploid (n) and forms a continuation of the female gametophyte. On the other hand, in angiosperms it is formed mostly as the result of a fusion of the two polar nuclei and one of the male gametes. Since all the three nuclei taking part in the fusion are haploid, the endosperm becomes triploid (3n). In normal cases, the endosperm is triploid but haploid, tetraploid and polyploid endosperms are also known. Generally the endosperm nucleus divides after the division of the oospore, but in several cases the endosperm is formed to a great extent even before the first division of the oospore. However, endosperm formation is suppressed in two angiospermic families, the Orchidaceae and Podostemonaceae.
Answer:
(1)Endosperm is anutritive tissue. It nourishes he developing embryo.
(2) The endosperm develops from the prirnary endosperm ucleus (PEN).
(3) The endosperm is a post fertlizatdon tissue.
(4) There are two Ypes or seeds depending upon the presence or absence of endosperm, endospermic and non-endospermic.
(5) Castor, coconut, maize, ete. are endospermic seeds, while bean, pea, grarn, etc. are non-endospernic seeds.