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Absorption By Roots - The Process Involved
Match the items in column I with those in column II
| A. Xylem | (i) Semi-permeable |
| B. Phloem | (ii) permeable |
| C. Cell membrane | (iii) downward flow of sap |
| D. Root pressure | (iv) upward flow of water |
| E. Cell wall | (v) Guttation |
A. Xylem | (i) upward flow of water |
B. Phloem | (ii) downward flow of sap |
C. Cell membrane | (iii) Semi-permeable |
D. Root pressure | (iv) Guttation |
E. Cell wall | (v) permeable |
Differentiate between the following pairs on the basis of what is mentioned within brackets:
i. Diffusion and osmosis (Definition)
| Diffusion | Osmosis |
|
Diffusion is the process of flow of substance (solvent, solute or gaseous molecules from their higher concentration to the region of their lower concentration, when the two are in direct contact. |
Osmosis is the process of the movement of the solvent molecule from the region of its higher concentration to the region of its lower concentration through a semi-permeable membrane. |
Explain the following term
ii. Turgor pressure
Turgor pressure is the pressure applied by the cell content on the cell membrane when water is taken in by endosmosis.
A. 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 follows:
i. Name the process being studied.
ii. Explain the process named above in Q 3 a i.
iii. Why was the pot covered with a plastic sheet?
iv. Suggest a suitable control for this experiment.
v. Mention two ways in which this process is beneficial to plant.
vi . List three adaptations in plants to reduce the above mentioned process.
i. Transpiration
ii. Transpiration is the loss of water as water vapour from the aerial parts of the plants.
iii. The pot covered with a plastic sheet so that the water vapour condenses on it and does not escape in the atmosphere.
iv. Apparatus without a plant.
v. Two ways in which this process is beneficial to plant
It has a cooling effect
It builds up the transpiration pull which is responsible the upward movement of water in tall plants.
vi. To reduce transpiration in the plants have the following adaptations
a. Sunken stomata
b. Leaves reduced to spine
c. Stomata on the lower surface of the leaves.
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Mock Test Series
Mock Test Series