Differentiate between:
$(a)$ Hypocotyl and epicotyl;
$(b)$ Coleoptile and coleorhiza;
$(c)$ Integument and testa;
$(d)$ Perisperm and pericarp.

Perisperm is $:-$

$A$ collar-like outgrowth arising from the base of the ovule and forming a sort of third integument is known as:

What are seeds that show tolerance to moisture and temperature reduction called?

The hilum is a scar on the

$A$: Fruit is a mature or ripened ovary,developed after fertilization.
$R$: If a fruit is formed without fertilization of the ovary,it is called a parthenocarpic fruit.