The response of plants to touch.

Describe the various types of morphogenetic movements of epithelial cells during early changes in the embryonic form and formation of organ rudiments.

in-vitro clonal propagation.

A mass of cells that divides to form the archesporial mother cells

Oogenesis in amphibians

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

(i) Sponges

(ii) Molluscs

(iii) Cyclostomes

(iv) Hemichordates

(v) Coelentrata

Define cleavage in fertilized egg and give its two main characteristic features. Describe the mechanism of cleavage in the fertilized egg.