A chain of cells that attaches the embryo to the embryo sac.

Plants that flower irrespective of the length of the day.

Origin of blastemal cells during regeneration in planarians.

List one larval form for each of the following animal groups:

(i) Sponges

(ii) Molluscs

(iii) Cyclostomes

(iv) Hemichordates

(v) Coelentrata

A wall layer of anther that helps in its dehiscence.

Prepare a detailed account on types of incompatibility, its biological significance and methods to overcome it.

The state of suspended growth and metabolism.