Question

1) Inaddition to water, mention the other three essential factors for seed germination.

2) What is the function of water in seed germination?

3) Some seeds do not germinate even though you have obtained the essential factors mentioned above. What is the condition called?
* Give two reasons for the situation you mentioned above.​

Answer 1

2 number answer goes like

During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. This stage is referred to as an Imbibition. It starts the growth process by activation of enzymes. The seed activates its internal physiology and starts to respire and produce proteins and metabolizes the stored food. This is a lag phase of the seed germination.

By rupturing of the seed coat, radicle emerges to form a primary root. The seed starts absorbing underground water. After the emerging of the radicle and the plumule, shoot starts growing upwards.

Answer 2

1) suitable temperature, air and oxygen

2) water soften the testa to enable both the plumule and radicle to emerge and it also allows diffusion of gases

3) Based on my opinion .... There is no water absent (dry cotton wool that used for germination), water is required for germination and the seed was kept in a refrigerator, thus low temperature is not suitable for germination.

Hope this helps