Plant Pollen Grain and Seed Science Project Idea
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Written by Dee
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Monday, 09 July 2007 |
Science project idea on how the pollen grain influences the development of the ovule into the seed.
How the Plant Pollen Grain Affects the Seed- Science Project Idea
It has been found that each pollen grain resting upon the surface of the stigma grows out into a tube which pushes its way down through the style until it reaches the ovary.The pollen tube now grows through a small opening (micropyle) on the side of the ovule.Some of the living material (sperm cell) of the pollen grain, containing a denser portion, the nucleus, passes down through the tube.
After the tube has penetrated into the ovule through the micropyle, the end of the tube disappears and the nucleus of the pollen (sperm cell nucleus) combines with the nucleus of a little bit of living matter in the ovule called the egg cell.The egg cell, which is now composed of living material from the pollen grain in addition to its own original living material, grows and divides into two, then four, eight, and finally thousands of little masses of living matter (cells) which arrange themselves to form the parts of the embryo or baby plant.
The egg cell, which is composed of living material from these two sources, is called a fertilized egg cell; and the union of the sperm cell nucleus with the egg cell nucleus is called the process of fertilization.Unless this process of fertilization occurs, the egg cell will not grow and divide, but will finally wither and die.
In all living things except the very lowest animals and plants, this general process of the union of two masses of living matter precedes the development of an egg into a new plant or animal.
Science Project Idea Show diagrammatically the steps in the process of the production of a seed.
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Last Updated ( Sunday, 22 July 2007 )
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