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What are seeds?

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What are seeds? After fertilization takes place, the egg cell develops into a seed from which a new plant can develop. The seed contains an embryo from which the new plant will grow.

It also contains a food store to nourish the embryo until it has developed roots and leaves. The seed is enclosed in a tough coat to protect it from drying out.

Seeds are the main means by which flowering plants reproduce and spread, though many can also spread by underground runners and shoots.

Can seeds fly?

Many seeds are carried by the wind. Some have a fluffy 'umbrella', which is carried for long distances. Others have wings that allow the seed to glide or spin around like a helicopter blade.The wings slow the seed's descent so that the wind can carry it further away. One particular seed, from a tropi cal tree called lanonia, glides so effectively it was used as the model for the wings of early planes.

A seed contains an embryo plant, together with a food store, which it will use
before it develops leaves and begins photosynthesis.The root emerges from the seed first, then as growth begins, the seed is carried above the soil surface, exposing the new leaves to light.

How does a seed grow?

The embryo in a seed contains everything that the seed needs to grow. The seed will not start to germinate until conditions are right. This usually means that the seed must be warm and moist.The embryo starts to grow, using its stored food supply, and soon bursts the seed coat. Usually the root emerges first, growing downwards in search of water, and the shoot follows.The first leaves to emerge are often fleshy organs that are part of the food store, and the leaves that appear later do not resemble them.


Tags: plants



Category: Education  - ( Education Archive)

Date Added: 15 December '11


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