GERMINATION is the term applied to the resumption of the growth of the seed embryo after the period of dormancy. A dormant seed , provided the favorable conditions exist, begins to grow out its shoot and its root.
It is the plumule of a seed that become the future shoot, and the radicle hat becomes the future root.
During germination, water diffuses through the seed coats into the embryo, which has been almost completely dry, causing a swelling of the seed. The swelling is often so great that the seed coat is ruptured.
With the absorption of oxygen by the seed, energy is made available for growth.
The radicle gets out first, ready to absorb water, followed by the plumule. Till the leaves are able to cook their own food, the cotyledons continue to provide nutrition.
Now what are the favorable conditions required for germination ? Explore and find out for yourself through the following activity.
Activity : Germination Requirements
Strengthen your knowledge through watching an enacted illustration as well.
Skit : "In the Heart of a Seed..." |
