Question

State reasons for the following:

(a) Cotyledons of seeds are called "seed leaves".

(b) Pines and Deodar are grouped as gymnosperms.

(c) Molluscs have open circulatory system.

Answer 1

a) Cotyledons serve as the nutritive tissue for the developing embryonal axis inside seed. They come out of the seed during seed germination as first leaves thats why they are also called seed leaves.

b) ​ Pines and Deodar are called gymnosperms as these types of plants are vascular, non flowering and produce naked seeds.

c) Molluscs have open circulatory means their blood is not restricted to flowing within blood vessels. Blood is pumped by heart to various body cavities surrounding tissues.