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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