Answer the following questions
1) why is transpiration important for plants ?
2) list the various modes of transpiration in plants?
3)can we call leaves as the principal organs o transpiration?give reasons.
4) what is the significnceof using cobalt chloride inexpriements on transpiration?
5) why does the rate of transpiration decreases in still air?
6) write any 2 advantages of transpiration in plants?
Answers
How is transpiration important to the plants? The process of transpiration keeps the cell turgid, cools the surface of the leaves, and helps in the movement of minerals from the soil to different parts of the plant.
1. Transpiration is important because
a) It helps in absorption and upward movement of water and minerals from roots to leaves.
b) It prevents the plant parts from heating up.
2. There are three kinds of transpiration: stomatal transpiration, cuticular transpiration and lenticular transpiration.
3. More leaves (or spines, or other photosynthesizing organs) means a bigger surface area and more stomata for gaseous exchange. This will result in greater water loss. More stomata will provide more pores for transpiration. A leaf with a bigger surface area will transpire faster than a leaf with a smaller surface area.
4. Dry cobalt chloride paper that is blue in colour turns pink when it comes in contact with water. Using this property of cobalt chloride paper we can demonstrate water loss during transpiration. We can measure the rate of transpiration by using the time taken for the paper to change its colour from blue to pink.
5. When the air is still or there is no wind, humidity may buildup around the plant from transpiration eventually decreasing the amount of water being released. When there is wind present, this causes the air to be replaced constantly allowing the plant to transpire. Increased humidity has a reduces transpiration.
6. Advantages of transpiration:
- It helps in the exchange of gases.
- It helps in sending out excessively absorbed water by plants.
- It helps in the absorption and distribution of water in plants.
- It provides coolness to the plant body.
- Osmotic balance of the cell is maintained by the process of transpiration.
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