Transport in Plants
- Minerals absorbed by roots move to the leaf through
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Minerals move upwards along with water, through the tracheary elements of xylem.
Correct Option: A
Minerals move upwards along with water, through the tracheary elements of xylem.
- Root pressure develops due to :
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Active absorption creates root pressure. In this process, the expenditure of energy takes place for the movement of substances against concentration gradient.
Correct Option: D
Active absorption creates root pressure. In this process, the expenditure of energy takes place for the movement of substances against concentration gradient.
- Water potential of actively absorbing cells is
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Water potential is regarded as the tendency of water to leave a system. Pure water has the highest possible water potential which is zero. All solutions have a water potential lower than that of pure water.
Correct Option: B
Water potential is regarded as the tendency of water to leave a system. Pure water has the highest possible water potential which is zero. All solutions have a water potential lower than that of pure water.
- 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
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Movement of water will be from low DPD to high DPD i.e from A to B
Correct Option: C
Movement of water will be from low DPD to high DPD i.e from A to B
- Which one gives the most valid and recent explanation for stomatal movements?
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The opening and closing of stomata are caused by influx and efflux of potassium ions (K+). The increase of K+ results in opening of stoma and decrease of K+ causes closing of stoma. The turgidity of guard cells induces the opening of the pores of stomata found on the surface of leaves.
Correct Option: A
The opening and closing of stomata are caused by influx and efflux of potassium ions (K+). The increase of K+ results in opening of stoma and decrease of K+ causes closing of stoma. The turgidity of guard cells induces the opening of the pores of stomata found on the surface of leaves.
