Page 94 - Science Class 07
P. 94
10
10
10
Transportation in Plants
• Transporta on in Plants • Network of Tubes
• Process of Transporta on • Transpira on
You have learnt that plants can make their own nutrients has to reach leaves and other parts.
food and are called as autotrophs. But did you All of this takes place through the vascular
ever wonder how this food that is prepared in ssues of the plants. This is basically the
the leaves goes to other parts of the plant’s transporta on in plants.
body? How does transporta on in plants In order to understand the process of transpor-
occur? Though not as complex as the ta on in plants, you should be familiar with the
transporta on system seen in animals, the following terms.
transporta on of raw materials and food in
Diffusion
plants occurs through a systema c network of
ssues. Let us understand the plant structure The movement of molecules, from the regions
along with internal vascular structure to know of greater concentra on to the regions of lesser
more. concentra on is known as diffusion.
TRANSPORTATION IN PLANTS Osmosis
The plant body is generally divided into roots, In this process, water molecules move from a
stem and leaves. The roots are in the soil, region of lower concentra on to a region of
which is the major source of nutrients in higher concentra on through the semi-
plants. Water and other nutrients enter the permeable membrane ll a state of equilibrium
plant through the roots. The leaves are the is reached.
food produc on centres. Using the sunlight
Imbibi on
and Carbon dioxide, they synthesise food
The phenomenon of absorp on of water by
through photosynthesis in the chloroplasts.
both living and dead ssues of the plants when
Now, food from the leaves has to reach the
soaked in water is called imbibi on.
other parts and the water along with other
94 Science-7
