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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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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Diffusion is very important to plants since:

1. The cells have a permeable cell wall

2. It is the only means for gaseous movement within the plant body.

3. Plants cannot transport material by active transport.

4. They are unable to move towards the source of the nutrients.

Subtopic:  Diffusion |
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Main factor deciding rate of diffusion is :-

1. Pressure/concentration gradient

2. Solubility of gases

3. Thickness of diffusion membrane

4. Posture of body 

Subtopic:  Diffusion |
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Rate of diffusion of substances is affected by all, except

1. Gradient of concentration

2. Temperature but not pressure

3. Density

4. Both temperature and pressure

Subtopic:  Diffusion |
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Simple diffusion is not saturated because

1. There is no requirement of energy

2. There is no requirement of carrier protein

4. It occurs along the concentration gradient

4. More than one option is correct 

Subtopic:  Diffusion |
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Osmotic pressure is the

(1) Pressure required to stop the water diffusing in

(2) Function of solute concentration

(3) More the solute, more is the pressure needed to stop endosmosis

(4) All of these

Subtopic:  Osmosis |
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The net direction and rate of osmosis depends upon

1. Pressure gradient

2. Concentration gradient

3. Chemical potential

4. All of these

Subtopic:  Osmosis |
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Apply concept of water potential and osmosis

The pressure applied in this experiment is

(1) Hydrostatic Pressure

(2) Colloidal pressure

(3) Osmotic pressure

(4) Pressure potential

Subtopic:  Osmosis |
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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 |
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