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 movernent 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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Substances that enter living cell by facilitated diffusion are

1. generally polar in nature

2. transported in the direction of concentration gradient 

3. transported with the help of carrier proteins 

4. all of the above

Subtopic:  Diffusion |
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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.

Subtopic:  Imbibition |
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In plants, water moves from

1. less negative to more negative potential

2. more negative to less negative potential

3. same potentials

4. none of the above.

Subtopic:  Water Potential Concept |
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Stomata opens

(1) in day time - for gaseous exchange

(2) in day time - no gaseous exchange

(3) in night time only - for gaseous exchange

(4) in night time only - no gaseous exchange.

Subtopic:  Transpiration & Guttation |
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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.

Subtopic:  Plant Water Relations: Water Potential: DPD |
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Which of the following helps in ascent of sap?

(1) Root pressure

(2) Transpiration

(3) Capillarity

(4) All of these

Subtopic:  Ascent of Sap |
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What do A, B, C and D represent in the following figure?

(1) A : carrier protein, B : symport, C : uniport, D : antiport

(2) A : carrier protein, B : uniport, C : antiport, D : symport

(3) A : carrier protein, B : antiport, C : symport, D : uniport

(4) A : carrier protein, B : uniport, C : symport, D : antiport

Subtopic:  Diffusion |
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What is correct about the movement of substance across the membrane in facilitated diffusion?

(1) It is an active transport.

(2) It cause transport of molecules from low concentration to high concentration.

(3) It is insensitive to inhibitors.

(4) It is a very specific transport.

Subtopic:  Means of Transport: Passive |
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The water logging capacity of garden soil will be determined by measuring the weight of 

(1) soil by adding water and humus

(2) water saturated soil then heating the soil till it is dry and then measuring the weight of soil

(3) soil by adding water, boimass and humus

(4) soil from different locations with biomass.

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