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Question
In an experiment, four freshly plucked leaves (A-D) of a plant, such as those of china – rose, were treated as follows:
(a) Coated with Vaseline on its upper surface.
(b) coated on the lower surface.
(c) coated on both surface
(d) left uncoated.
All the four leaves A, B, C & D were left in a room for about 24 hours.
(i) which leaf would become most limp? Why?
(ii) which leaf would show least limping? Why?
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Solution
(i) The leaf D would become most limp. This is because water would be lost through transpiration from upper as well as the lower surface of leaf D since it is uncoated.
(ii) The least limping would be shown by leaf C since its upper and lower surfaces have been coated with vaseline. So no water is lost from the leaf through transpiration since the stomatal openings get blocked by vaseline.
RELATED QUESTIONS
The loss of water as water vapour from the acrial parts of a plant is known as
Transpiration is best defined as
(a) State whether the following statement are True (T) or False (F)
(b) Rewrite the false statement in (a) above in the correct form by changing either the first or the last word only.
Wind velocity has an effect on transpiration.
What is wilting? Some plants show wilting of their leaves at noon even when the soil is well watered, Why is it so?
Expand the following biological abbreviations :
IAA
Explain how the rate of transpiration is affected on:
a windy day
Briefly explain how the rate of transpiration is affected by:
The intensity of light.
How does the rate of Transpiration differ when there is High temperature?
How does the rate of Transpiration differ when there is High humidity?
