Which one of the following elements in plants not re-mobilized?
1.  Calcium

2.  Potassium
3.  Sulphur
4.  Phosphorus

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

1.  lignified thick walls

2.  cohesion and adhesion

3.  weak gravitational pull

4.  transpiration pull

Subtopic:  Transpiration & Guttation | Transpiration Pull: Illustration |
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Two cells A and B  are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure-7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be:

1. Movement of water from cell B to A

2. No movement of water

3. Equilibrium between the two

4. Movement of water from cell A to B

Subtopic:  Plant Water Relations: Water Potential: DPD |
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The translocation of organic solutes in sieve tube members is supported by:

1. root pressure and transpiration pull

2. P-proteins

3. mass flow involving a carrier and ATP

4. cytoplasmic streaming

Subtopic:  Phloem Translocation |
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Which one of the following is correctly matched?

1. Passive transport of nutrients-ATP

2. Apoplast- Plasmodesmata

3. Potassium- Readily mobilized

4. Bakane of rice seedlings-F Skoog

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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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:  Means of Transport: Active |
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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

 

Subtopic:  Stomata: 3 | Stomata |
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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

 

Subtopic:  Phloem Translocation |
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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

Subtopic:  Transpiration & Guttation |
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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:  Transpiration Pull: Illustration |
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