Fruit is developed from which of the following?

Examine the figure given below and select the right option identifying all the four parts $a, b, c$ and $d$.

Seeds are adaptively important because:
$1.$ they maintain dormancy
$2.$ they protect young plants during vulnerable stages
$3.$ they store food for young plants,and facilitate dispersal

Perisperm is

In groundnut, the source of oil is found in:

$A$ seed is defined as $...$