Q. No.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
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
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 an osmotic pressure of 8 atm, turgor pressure of 3 atm, and diffusion pressure deficit of 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
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull
| 1. | Calcium | 2. | Potassium |
| 3. | Sulphur | 4. | Phosphorus |
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
2. Potassium influx and efflux
3. Starch hydrolysis
4. Guard cell photosynthesis
In a ring-girdled plant:
2. the root dies first
3. the shoot and root die together
4. Neither root nor shoot will die
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