Given below is a longitudinal section of a bean seed. Label the parts marked 1 to 5 and write their functions.

The parts marked 1 to 5 are:

1. Testa
2. Plumule
3. Radicle
4. Micropyle
5. Cotyledon

Their functions are as follows:

1. Testa — It protects the seed from insect and bacteria as well as from mechanical injury.
2. Plumule — It develops into the shoot.
3. Radicle — It develops into the root.
4. Micropyle — It absorbs and allows the entry of as much water as is required for germination.
5. Cotyledons — They contain stored food material which is used by the seedlings for growth.