Q. No.Which one of the following elements in plants is not remobilised?
1. Calcium
2. Potassium
3. Sulphur
4. Phosphorus
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
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Passage cells are thin-walled cells found in:
1. endodermis of roots facilitating rapid transport of water from cortex to pericycle
2. phloem elements that serve as entry points for substances for transport to other plant parts
3. testa of seeds to enable emergence of growing embryonic axis during seed germination
4. central region of style through which the pollen tube grows towards the ovary
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
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
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Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of
1. imbibition
2. endosmosis
3. capillarity
4. deplasmolysis.
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In plants, water moves from
1. less negative to more negative potential
2. more negative to less negative potential
3. a point to another point with the same potential
4. none of the above
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If turgor pressure becomes equal to the wall pressure, then
1. water leaves the cell
2. water enters the cell
3. no exchange of water takes place
4. solute goes from the cell into water
Which of the following helps in ascent of sap?
1. Root pressure
2. Transpiration
3. Capillarity
4. All of the above
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Assertion: Like animal cells, sodium ions play the primary role in basic transport processes in plant cells.
Reason: In plant cells, the membrane potential is established mainly through pumping of sodium ions by sodium-potassium pumps.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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