It was a holiday. Abdul was helping his
Abbu in the garden. Abbu was clearing the dried leaves and grass from the
vegetable beds. Abdul started to pull out the grass from one of the beds.
He found that it was not easy to pull
out even the small grass. His hands became red by the effort. In trying to pull
out grass,
Abdul knocked down a stick that was supporting
the pea plant. The delicate stem of the pea plant broke.
Abbu said, “Why are you pulling the grass? The roots of the grass are strong. You will have to dig them out.” Abdul carefully dug out the plant.
He then saw that the roots of the grass
plant were longer and much more spread out than the part of the plant above the
ground. The stick which was stuck in the ground fell very easily. It was
difficult to pull out a small grass.
Imagine how deep and spread out the
roots of these are. Most of the plants have the same basic parts. Each parts
has its own work to do. These parts work together and keep the plant alive.
A plant can be divided into two
parts.they are shoot and root. The part of the plant which is above the soil is
called the shoot. The part of the plant that grow under the soil is called the
root.
Children you cannot see it above the
ground. Some plants have a thick main root below the stem. It goes deep into
the soil.
Several thinner side roots grow from the
main root. Such root are taproots. Examples are baslsam, hibiscus, bean and
mustrard have tap roots.
Grass has no main root. It has a number
of tiny roots attached to the end of the stem. It looks like abunch of roots
these are called fibrous roots.
Let us see wat orrts do?
Plants need water and salts from the
soil. Roots take these and send them up to the stem and leaves. Roots of some
plants such as carrot, radish and beetrrot, store the food prepared by the
plant.
After three days, Abdul saw that one broken
part of the pea plant had dried. Guess which part would have dried up? Why ?
Abbu remembered that he had to send some radish home. He started to pull the
radish out of the soil.
Abdul wondered whether these were also roots. Only a few radish were pulled when there was suddenly a strong wind and rain. Both of them picked up the radish and ran. They had just reached home when a branch of the neem tree in the courtyard broke and fell.
In fact, Abbu was lucky to have missed
by only a few inches. Despite the strong wind the tree remained firm on the
ground. They both sat down to have tea with Ammi .
Abbu said to Abdul, “The plants were
getting dry. Now that it has rained, we will not have to water the plants. We
can now sit and play ludo.”
Nowadays Abdul keeps thinking about all
kinds of plants that he sees. Abdul saw a plant growing out of a wall in
school. He wondered.
Plants absorb water through their entire
surface – roots, stems and leaves. However, the majority of water is absorbed
by root hairs. They are in close contact with the thin film of water
surrounding the soil particles.
The cell wall of the root hair is
permeable to water and minerals, Because of this osmosis occurs and the water
is absorbed by the root hairs through cell membranes from the soil.
Abdul saw a huge tree that had fallen on
the roadside. He remembered the neem tree in his courtyard. He could see some
of its broken roots.
Unusual Roots
Have you swung from a banyan tree? What
did you hold to swing? What looks like the hanging branches are actually the
roots of the tree. These grow down from the branches until they reach the
ground. These roots are like pillars that provide strong support to the tree.
There is a law against cutting trees. There
was a tree growing close to a lamp post. The tree was so full of leaves that
the light of the bulb was blocked.
People felt that the branches of the
tree needed to be trimmed. Before they do this, they need to take written
permission from the government office.
Desert Oak is a tree that is found in
Australia. It grows almost as tall as your classroom wall. It has very few
leaves. Guess how deep its roots go down? Imagine the length of about 30 such
trees laid down in a line end to end, one after another.
That is how long the roots of this tree
can be. These roots go deep into the ground till they reach water. This water
is stored in the tree trunk.
When there was no water in the desert,
the local people use to put a thin pipe into the trunk of the tree, to drink
this water.
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