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Q. No.The innermost layer of the cortex in the roots that restricts the apoplastic transport of water inside is called as:
1. Hypodermis
2. Endodermis
3. Pericycle
4. Stele
Subtopic: Water Absorption |
86%
Level 1: 80%+
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What would be incorrect for phloem in angiosperms?
1. Phloem fibres, at maturity, lose their protoplasm and become dead.
2. The function of sieve tubes is controlled by the nucleus of companion cell.
3. The direction of movement in the phloem can be bi-directional.
4. Phloem sap is mainly water and starch.
1. Phloem fibres, at maturity, lose their protoplasm and become dead.
2. The function of sieve tubes is controlled by the nucleus of companion cell.
3. The direction of movement in the phloem can be bi-directional.
4. Phloem sap is mainly water and starch.
Subtopic: Phloem Translocation: Short Distance Transport | Phloem Translocation |
70%
Level 2: 60%+
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Apoplastic movement of water in plants:
| 1. | involves crossing the cell membrane multiple times |
| 2. | is through mass flow |
| 3. | accounts for a very small fraction of water flow in roots |
| 4. | is relatively much slower than the symplastic flow |
Subtopic: Water Absorption |
61%
Level 2: 60%+
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Identify the correct statement:
| 1. | Unlike facilitated transport, simple diffusion requires special membrane proteins |
| 2. | Both simple diffusion and facilitated transport are highly selective |
| 3. | Facilitated transport is an uphill transport and requires ATP energy |
| 4. | Both facilitated transport and active transport are liable to saturate |
Subtopic: Diffusion | Means of Transport: Active | Means of Transport: Passive |
81%
Level 1: 80%+
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Which of the following statements is correct regarding diffusion:
| 1. | Diffusion of solids rather than diffusion in solids is more likely. |
| 2. | The diffusion rate depends upon the size of the substances; smaller substances diffuse slower |
| 3. | Diffusion is dependent on a living system |
| 4. | Movement by diffusion is passive and no energy expenditure takes place in the process |
Subtopic: Diffusion | Means of Transport: Passive |
79%
Level 2: 60%+
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Which one of the following is essential for the process of imbibition to take place?
| I: | Water potential gradient between the adsorbent and the liquid imbibed |
| II: | Affinity between the absorbent and the liquid |
| III: | Affinity between the adsorbent and the liquid |
| IV: | Water potential gradient between the absorbent and the liquid imbibed |
| 1. | Only III and IV | 2. | Only I and II |
| 3. | Only I and III | 4. | Only II and IV |
Subtopic: Imbibition |
Level 4: Below 35%
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Xylem is associated with the translocation of:
| 1. | a variety of organic and inorganic solutes |
| 2. | water and a variety of organic and inorganic solutes |
| 3. | water, mineral salts, some organic phosphorus and hormones |
| 4. | water, mineral salts, some organic nitrogen and hormones |
Subtopic: Long Distance Transport of Water |
75%
Level 2: 60%+
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What could be considered as the most significant contribution of root pressure in the process of water transport?
| 1. | It provides a push which plays a major role in movement of water up the trees |
| 2. | It re-establishes the continuous chain of water molecules in the xylem which often breaks under the enormous tension created by transpiration |
| 3. | It helps in active transport of various ions into the vascular tissues of the root from the soil |
| 4. | It helps in loss of excess water in its liquid phase (guttation) |
Subtopic: Transpiration & Guttation |
71%
Level 2: 60%+
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"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
| 1. | osmosis is observed |
| 2. | water is transported |
| 3. | food is transported |
| 4. | for both water and food transportation |
Subtopic: The Pressure Flow or Mass Flow Hypothesis |
58%
Level 3: 35%-60%
NEET - 2022
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Which of the following is not observed during apoplastic pathway?
| 1. | Apoplast is continuous and does not provide any barrier to water movement. |
| 2. | Movement of water occurs through intercellular spaces and wall of the cells. |
| 3. | The movement does not involve crossing of cell membrane |
| 4. | The movement is aided by cytoplasmic streaming |
Subtopic: Pathways of transport |
64%
Level 2: 60%+
NEET - 2022
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