Explain the different types of endosperms in angiosperms.

Explanation

The different types of Endosperms found in angiosperms are:
(i) Nuclear endosperms : The endosperm nucleus gives rise to a number of free nuclei which stay in the peripheral layer. A large central vacuole appears in the embryo sac. Cell wall formation takes place from the periphery towards the centre leading to the formation of cellular endosperm. Examples: Maize, Wheat, Rice, Sunflower etc.
(ii) Cellular Endosperm : Division of the primary endosperm nucleus is immediately followed by cell wall formation so that the endosperm is cellular from the beginning. Examples: Balsam, Datura, Petunia, Villarsia etc.
(iii) Helobial Endosperm : A partition wall develops between the two nuclei resulting in the first division of the endosperm. Endosperm development is intermediate between the free nuclear and cellular type. A partition wall develops between the two nuclei resulting in the first division of the endosperm. Examples: Asphodelus, Echium, etc.