Question

With reference to germination explain

1. the meaning of the term imbibition 
2. why the dry mass of the endosperm decreases while that of the embryo increases. 

Answer 1

1. (Rapid) absorption of water by (germinating) seed (through the micropyle/seed coat).
2. During germination, stored food in the endosperm is broken down/hydrolyzed/oxidized; to provide nutrients for the growing embryo.