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प्रश्न
The percentage of cuticular transpiration in plants is approximately ______.
विकल्प
10%
20%
25%
30%
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उत्तर
The percentage of cuticular transpiration in plants is approximately 10%.
Explanation:
Cuticular transpiration is the loss of water vapour directly through the cuticle, which is the waxy protective layer covering the epidermis of leaves and stems. In most standard terrestrial plants, this process is relatively minor and accounts for roughly 5% to 10% of the total water lost by the plant. Since the cuticle’s primary function is to prevent dehydration, it restricts water vapour loss, leaving the vast majority of transpiration (around 85-90%) to happen through the stomata instead.
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संबंधित प्रश्न
What are stomata?
An apparatus, as shown below, was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
- Name the process being studied.
- Explain the process named above in Q.3(a)(i).
- Why was the pot covered with a plastic sheet?
- Suggest a suitable control for this experiment.
- Mention two ways in which this process is beneficial to plants.
- List three adaptations in plants to reduce the above mentioned process.
Name the process by which water loss takes place through the leaves.
Given below is a diagrammatic sketch (surface view) of a stomatal apparatus from a dicot leaf.
(a) Label the parts numbers 1-3
(b) Is this state, open or closed?
(c) Is this stoma, of a dicot leaf or a monocot leaf?
(d) Redraw a sketch of the stomatal apparatus in the state opposite to the one shown here.
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in dark.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like magnet). How will you explain this property of water with reference to upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.
Observe the following diagram and identify the process and its significance from the following options:
Enlist different advantages of transpiration.
