In active transport, carrier proteins are used, which use energy in the form of ATP, to:

(1) transport molecules against the concentration gradient of the cell wall.

(2) transport molecules along the concentration gradient of the cell membrane.

(3) transport molecules against the concentration gradient of the cell membrane.

(4) transport molecules along the concentration gradient of the cell wall.

Subtopic:  Means of Transport: Active |
 73%
From NCERT
AIIMS - 2011
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The modified equation for water potential is:

1. Ψw= Ψs + Ψp

2. Ψw = Ψs-Ψp

3. Ψw=Ψs

4. Ψw=Ψp-Ψs

Subtopic:  Water Potential Concept |
 90%
From NCERT
AIIMS - 2017
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Osmosis is a type of 

(1) imbibition of solution   

(2) diffusion of solvent

(3) evaporation of water   

(4) diffusion of solute

Subtopic:  Osmosis |
 78%
From NCERT
AIIMS - 2014
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What is correct about the movement of substances across the membrane in facilitated diffusion?

1. It is an active transport.

2. It causes the 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 |
 75%
From NCERT
AIIMS - 2010
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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 |
 89%
From NCERT
AIIMS - 2010
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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 |
 83%
From NCERT
AIIMS - 2007
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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 |
 85%
From NCERT
AIIMS - 2001
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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 |
 95%
From NCERT
AIIMS - 2001
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Transpiration is very important for plants because it helps in 

1. the absorption of water from soil

2. the cooling of leaves at high temperature

3. the movement of water and minerals absorbed by roots to various parts of the plant

4. all of the above

Subtopic:  Transpiration & Guttation |
 93%
From NCERT
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Substances that enter the living cells by facilitated diffusion are:

1. generally polar in nature

2. transported in the direction of the concentration gradient 

3. transported with the help of carrier proteins 

4. all of the above

Subtopic:  Diffusion |
 89%
From NCERT
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