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.

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

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

Assertion      :       Facilitated diffusion is more rapid than simple diffusion.

Reason         :       Facilitated diffusion involves expenditure of energy unlike simple diffusion.

Diffusion

Find the wrong option:

1. Passive

2. Over shorter distances

3. No energy expenditure

4. Movement in ordered fashion

Diffusion

Find the wrong one.

1 .Dependent on a living system

2. Obvious in gases and liquids

3 .In solids rather than of solids is more likely

4. Diffusion is very important in plants since it is the only means for gaseous movement within the plant body

Which of the following is not parameter to affect diffusion concentration? 

1 .Gradient of concentration 

2. Permeability of the membrane separating them 

3. Temperature, Pressure 

4. Gas constant 

The diffusion of any substance across a membrane depends on 

1 .Solubility in proteins 

2 .Solubility in carbohydrates 

3 .Solubility in lipids 

4. Solubility in glycolipids 

Substances which are soluble in lipids…….a…...But which have a hydrophilic moiety……..b……

1. a- move slowly

2. a- move similarly as that of others

3. b- move faster

4. a- move faster

 Which of the following is not sensitive to inhibitors? 

1 .Pump 

2 .Diffusion 

3. Facilitated Diffusion 

4. Potions