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प्रश्न
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:
Mention two ways in which this process is beneficial to plants.
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उत्तर
Transpiration is beneficial to plants in the following ways:
- It creates a suction force in the stem which enables the roots to absorb water and minerals.
- It helps in cooling the plant in hot weather.
संबंधित प्रश्न
What causes the opening and closing of guard cells of stomata during transpiration?
The loss of water in the form of water vapour through stomata on leaves is known as ___________.
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.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Name the phenomenon being demonstrated.
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in dark.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Would it make a difference if the experimental set-up is kept in bright sunshine?
Give Technical Term
When cobalt chloride paper is placed on lower and upper surface of the leaf, the paper of which side becomes more pink?
Define the term:
Guttation
Boojho wanted to test the presence of starch in leaves. He performed the following steps.
- He took a leaf and boiled it in water.
- He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? 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.
