Question

que-: what kind of germination is shown by this structure.
​

Answer 1

Answer:

Germination is the beginning of growth of a seed.

The seed requires warmth and moisture to germinate.

First, the seed leaves absorb moisture which allows the food reserves to become available to the new plant.

It then produces a radicle which is called as the first root, so that it can absorb water, followed by a shoot which develops from the plumule, which will allow it to absorb light as the plant needs both water and light to grow.

There are two types of germinarion and they are as follows:

Hypogeal Germination:

In this kind of germination, the cotyledons do not come out of the soil surface. In such seeds the epicotyl (i.e., part of embryonic axis between plumule and cotyledons) elongates pushing the plumule out of the soil.

All monocotyledons show hypogeal germination.

Among dicotyledons, gram, pea, groundnut are some common examples of hypogeal germination.

Epigeal Germination:

In seeds with epigeal germination, the cotyledons are brought above the soil due to elongation of the hypocotyl.

In castor, cotton, papay, onion, flat green leaves like cotyledons can be seen in the young seedlings.

Here the cotyledons, besides food storage, also perform photosynthesis till the seedling becomes independent.