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Q. No.Root pressure develops due to?
1. Active absorption
2. Low osmotic potential in Soil
3. Passive absorption
4. Increase in transpiration
Subtopic: Â Ascent of Sap |
 54%
From NCERT
NEET - 2015
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A column of water within xylem vessels of tall trees does not break under its weight because of?
1. Dissolved sugar in water
2. Tensile strength of water
3. Lignification of xylem vessels
4. Positive root pressure
Subtopic: Â Transpiration Pull: Illustration |
 72%
From NCERT
NEET - 2015
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Transpiration and root pressure cause water to rise in plants by:
1. pulling it upward
2. pulling and pushing it, respectively
3. pushing it upward
4. pushing and pulling it, respectively
2. pulling and pushing it, respectively
3. pushing it upward
4. pushing and pulling it, respectively
Subtopic: Â Transpiration & Guttation |
 70%
From NCERT
NEET - 2015
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In a ring-girdled plant:
1. the shoot dies first
2. the root dies first
3. the shoot and root die together
4. Neither root nor shoot will die
2. the root dies first
3. the shoot and root die together
4. Neither root nor shoot will die
Subtopic: Â Phloem Translocation |
 76%
NEET - 2015
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Hints
Which one gives the most valid and recent explanation for stomatal movements?
1. Transpiration
2. Potassium influx and efflux
3. Starch hydrolysis
4. Guard cell photosynthesis
2. Potassium influx and efflux
3. Starch hydrolysis
4. Guard cell photosynthesis
Subtopic: Â Stomata: 3 |Â Stomata |
 72%
NEET - 2015
Please attempt this question first.
Hints
Which of the following criteria does not pertain to facilitated transport?
1. High selectivity
2. Transport saturation
3. Uphill transport
4. Requirement of special membrane proteins
Subtopic: Â Means of Transport: Active |
 85%
AIPMT - 2013
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Hints
Which one of the following is correctly matched?
1. Passive transport of nutrients-ATP
2. Apoplast- Plasmodesmata
3. Potassium- Readily mobilized
4. Bakanae of rice seedlings-F Skoog
Subtopic: Â Photosynthesis Transpiration Compromise & Mineral Translocation |
 72%
From NCERT
AIPMT - 2012
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Which one of the following elements in plants not re-mobilized?
| 1. | Calcium | 2. | Potassium |
| 3. | Sulphur | 4. | Phosphorus |
Subtopic: Â Photosynthesis Transpiration Compromise & Mineral Translocation |
 89%
From NCERT
AIPMT - 2011
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Subtopic: Â Transpiration & Guttation |
 89%
From NCERT
AIPMT - 2011
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Function of companion cells is:
| 1. | Loading of sucrose into sieve elements |
| 2. | Providing energy to sieve elements for active transport |
| 3. | Providing water to phloem |
| 4. | Loading of sucrose into sieve elements by passive transport |
Subtopic: Â Phloem Translocation |
 61%
From NCERT
AIPMT - 2011
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