Gujarat BoardEnglish MediumSTD 10Sciencelife processes4 Marks
Question
Explain transportation in plants.
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Answer
The plants obtain carbon dioxide $(CO_2)$ from the atmosphere and water and minerals from the soil and with the help of chlorophyll in their cells, transform the solar energy into chemical energy through the process of photosynthesis. In the process they synthesize carbohydrate (glucose).
The absorbed water and minerals are required to be transported to different parts of the plant body.
Diffusion:
If the distance between the roots and the leaves is less and negligible, the energy and raw materials including water can easily be transported in all the parts of the plant body just through the process of diffusion.
Transportation (Conducting) system:
When in plants the distance between the roots and leaves is more, the process of diffusion is not sufficient.
Therefore, there is suitable conducting system.
The plants are stationary so they do not need much energy as compared to motile animals.
Even then the energy stored in leaves and the raw materials and water absorbed by roots are transported to different parts of the plant body.
There are two independent conducting tissues in plants. They are:
$(1)$ Xylem: For transportation of water and minerals absorbed from soil.
$(2)$ Phloem: For transportation of products of photosynthesis from leaves to other parts of the plants.
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