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Question
In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?
Solution
In a girdled plant leaves remain green for some time when the water supply is above the girdle leaves. This is because leaves carry on photosynthesis in the presence of water. But leaves will not be able to translocate the food prepared by them as the girdling also damages the phloem. This finally results in the death of the leaves above the girdle, even if there is a regular supply of water.
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RELATED QUESTIONS
Read the statements I and II and carefully and choose the correct option.
Statement I: Large amount of water absorbed through roots is used for photosynthesis and other activities; the rest of the water is transpired as water vapour.
Statement II: Transpiration is the evaporative loss of water by plants.
Transpiration is helpful to plants in :
The C4 plants are twice as efficient as C3 plants in terms of fixing CO2 but lose only ______ as much water as C3 plants for the same amount of CO2 fixed.
