It
is a well know fact that trees and plants are also living beings. They need
food, water, and air for survival. It is interesting to know how they take
their food.
Plants
derive their food both from the earth and the air. If you minutely look at
their roots, you will find that the ends of these roots are like fine fibres.
We call them roots-hairs. They absorb water and minerals and transport them
upward to the leaves through the trunk and the branches. It is the leaves which
preapare the food.
The
gree material, chlorophyl, present in the leaves prepares the food like a
machine. It convers the carbon dioxide taken from the air and water from the
ground into sugar with the help of sunlight. This chemical reaction is called
photosynthesis. In fact, the chlorophyll takes energy from the sunlight and
uses it to bon dioxide for making sugar. This reaction also gives out oxygen
and water which are excreted by the leaves.
Sugar
is further converted into starch and is stored in the plant. The minerals are
converted by chemical processes into proteins, juice, oil, and other edible
materials. The plants use these materials as their food for growth. This food
gradually passes on all the parts of the plant. A part of this food is
deposited in the seed under information in the plant. This accumulated food in
the seed is used in germination.
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