BIOLOGY [1 Mark Question Answer]

Micropyle — Above the hilum is a small pore called micropyle (micro = small, Pyle = passage). The micropyle absorbs and allows as much water as is required for germination.

Endosperm — ovary forms the fruit.

Cotyledons — On removing th& testa and the tegmen from a soaked bean seed, you will find that the seed is made up of two fleshy seed leaves called the cotyledon. They contain stored food material which is used by the seedling for growth.

Radicle — form the roots

Radicle comes out of the seed earlier than the plumule has advantages as it gets water and minerals from the soil and gives it to the growing plumule.

Bean seed castor seed, tamarind seed

Bean seed, gram seed, pea seed

Maize seed, wheat seed

pea seed, maize seed

(a) Roots — Radicle give rise to roots.
b) Leaves—Plumule gives rise to shoot bearing leaves.

Anther: It is present at the end of a stamen. Anther has poller sacs in which pollen grains are formed. Pollen grains contain male gametes.

The transfer of the pollen grains from the anthers to the stigma of a flower is called pollination.

Seed coat: Seed coat is the outer covering of the seed which protects the seed (embryo and endosperm) from injury and attack of bacteria, fungi, and insects.

Plumule: The plumule is the portion of the plant embryo which gives rise to first leaves and forms the shoot system of the plant during germination.

Seed germination is the process by which the embryo within the seed becomes active and grows into a new plant under favourable conditions.

Radicle: The radicle is the part of an embryo inside the seed which first comes out of the seed coat during germination and forms the root system of the plant.