- 1(current)
Q. No.I. Over small distances, in plants, substances move by diffusion and by cytoplasmic streaming supplemented by active transport.
II. Transport over long distances, in plants, proceeds through the vascular system and is called as transpiration.
1. Only I is correct
2. Only I is incorrect
3. Both I and II are correct
4. Both I and II are incorrect
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The movement of water through the root layers is ultimately:
| 1. apoplastic along the walls | 2. active transport by porins |
| 3. symplastic in the endodermis | 4. symplastic in the xylem |
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In the mycorrhizal symbiotic relationship, the root provides the fungus with:
| 1. Water | 2. Phosphorus |
| 3. N – containing compounds | 4. Sodium and potassium |
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Mycorrhiza is a symbiotic association of fungus with root system which helps in:
| A. Absorption of water | B. Mineral nutrition |
| C. Translocation | D. Gaseous exchange |
| 1. Only A | 2. Only B |
| 3. Both A and B | 4. Both B and C |
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I: The movement is relatively slower via the apoplast but the movement is down a potential gradient.
II: The symplast does not provide any barrier to water movement and water movement is through mass flow.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
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I. Root hairs are thin walled slender extensions of root epidermal cells that greatly increase the surface area for absorption.
II. Water is absorbed along with mineral solutes, by the root hairs, by diffusion as well as by active transport aided by cytoplasmic streaming.
1. Only I
2. Only II
3. Neither I nor II
4. Both I and II
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Unloading of mineral ions occurs at the fine vein endings through:
1. diffusion and, are passively taken up by the sink cells
2. active transport and, are passively taken up by the sink cells
3. diffusion and, are actively taken up by the sink cells
4. active transport and, are actively taken up by the sink cells
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An analysis of xylem exudates will show that most of the nitrogen is carried as:
1. Inorganic ions
2. Ammonia dissolved in water
3. Dinitrogen
4. Organic compounds such as amino acids
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- 1(current)
Q. No.
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