Question

what are the three types of endosperm? describe them briefly

Answer 1

Answer:

Three main types of endosperm development in flowering plants are: (i) Nuclear type (ii) Cellular type and (iii) Helobial type! pls mark as brainliest

Explanation:

(i) Nuclear type:

In nuclear type of endosperm the first division of primary endosperm nucleus and few subsequent nuclear divisions are not accompanied by wall formation. The nuclei produced are free in the cytoplasm of the embryo sac and they may remain free indefinitely or wall formation takes place later.

(ii) Cellular type:

In this case, there is cytokinesis after each nuclear division of endosperm nucleus. The endosperm, thus, has a cellular form, from the very beginning because first and subsequent divisions are all accompanied by wall formation e.g. Petunia, Datura, Adoxa, etc.

(iii) Helobial type:

It is an intermediate type between the nuclear and cellular types. The first division is accompanied by cytokinesis but the subsequent ones are free nuclear. The chamber towards micropylar end of embryo sac is usually much larger than the chamber towards chalazal end.

Answer 2

The Endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization.

Types of endosperm :

• nuclear endosperm - the division of the primary endosperm nucleus and its further divisions are not followed by wall formation.

• cellular endosperm - the division of primary endosperm nucleus and its further divisions are followed by immediate wall formation and the free nuclear stage is completely absent . It is common in dicots.
• helobial enosperm - it is intermediate in structure. Development is intermediate between nuclear and cellular types. It is more common in monocots.