How do you distinguish between hypogeal germination and epigeal germination ? What is the role of cotyledon $(s)$ and the endosperm in the germination of seeds ?

$\rightarrow$ difference between hypogal and epigeal germination.

$\rightarrow$ Contribution of cotyledons and endosperm : Seed coat and endosperm possess stored food, while seed does imbibition of water. Enzymes become active, stored food does hydrolysis of food and converts into available form for germination.