CBSE Class 12-science Answered

Type of endosperm

Description

Nuclear Endosperm

• 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.

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.

Helobial Endosperm

• A partition wall develops between the two nuclei resulting in the first division of the endosperm.
• A large number of free nuclei are now developed in the upper chamber while the lower nucleus forms few of them or may not divide at all.
• Examples: Vallisneria, Eremurus, Limnophyton etc.