Question

Explain the stages of germination with the help of diagrams.

Answer 1

Hint: Germination is defined as a process by which a plant develops from the seed and develops of its parents kind.
The five steps mainly occur in seed germination. It is a very crucial event for the production of future generations.

Complete answer:
Imbibition:-
It is the process by which seed absorbs water. It is the first process in seed germination. It is a type of diffusion. The seed volume increased. The water uptake is by the dry seed. The non dormant seed takes up water. When seeds take water it starts to develop its radical.
Respiration:- when oxygen is supplied to the seed it starts to grow. So the seeds respire for the exchange of gases and start to grow. Seed coat ruptures now.
Light:- seeds take up light for their further growth. The radicle that is root grows away from light and the plumule that is shot starts growing towards light. The two conditions are called negative phototropism and positive phototropism respectively.
Growth regulators:- when seeds are being provided with growth regulators such as auxin and cytokinin and further grows. The seed expands and becomes a rich source of food.
Embryo development:- the seed now converts into embryo. Embryo is the future generation of the plant. Now the germination of seed gets completed.

Note:
> When germination takes place above the ground it is termed as epigeal germination.
> When germination takes place below the ground it is termed as hypogeal germination.
> The region of embryo above the cotyledon is called epicotyl.
> The region of embryo below cotyledon is called hypocotyl.