Diffusion

Q.

Residual volume is

1. Lesser than tidal volume

2. Greater than inspiratory volume

3. Greater than vital capacity

4. Greater than tidal volume

Q.

During rainy season wooden doors are difficult to open or closure because of

1. Plasmolysis

2. Imbibition

3. Osmosis

4. Diffusion

Q.

Cell membrane is ________.

1. permeable

2. impermeable

3. semipermeable

4. none

Q. Choose the correct option with respect to the process of diffusion.

1. Occurs until equilibrium is achieved
2. Diffusing particles exert diffusion pressure
3. A method by which gaseous transport occurs in plants
4. All of the above

Q. Why does the skin of fingers shrink when washing clothes for a long time?

1. Soap solution has high concentration of solutes (hypertonic)
2. Water moves out of finger due to exosmosis
3. Both A and B
4. None of the above

Q.

Which of these factors affect the rate of diffusion?

1. Concentration of molecules

2. Molecular weight

3. Temperature

4. All of the above

Q. From the following options, identify the factor that affects the rate of diffusion.

1. Temperature
2. Size of diffusing molecules
3. Concentration gradient
4. All of these

Q. Which among the following is true about diffusion?

1. It requires energy
2. It does not require energy
3. Energy is produced
4. Energy is absorbed

Q.

Assertion : Pressure potential is affected by both solute and water potential.

Reason : Pressure potential is always positive.

1. if both A and R are true and R is the correct explanation of A

2. if both A and R are true but R is not the correct explanation of A

3. if A is true but R is false

4. if both A and R are false.

Q.

Which part in brain control Respiration?

Q.

Assertion : Both facilitated diffusion and active transport are mediated through membrane proteins.

Reason : Only active transport is selective in action.

1. if both A and R are true but R is not the correct explanation of A

2. A is true but R is false

3. if both A and R are false.

4. if both A and R are true and R is the correct explanation of A

Q. Which of the following molecules can pass through the membrane freely?

1. Sucrose
2. Glycerol
3. Ammonia
4. Water

Q.

How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?

Q. The physical process directly involved in the release of molecular oxygen from leaves is

1. diffusion
2. transpiration
3. osmosis
4. active transport

Q.

What are porins? What role do they play in diffusion?

Q.

what is the difference between diffusion and fascilitated diffusion ?

Q. Which of the following boundaries do the molecules have to cross during short distance transport?

1. Cell wall
2. Cell membrane
3. Plasma membrane
4. All of the above.

Q. Name the process which is useful for the movement of substances like CO${}_2$ and O${}_2$ across the cell membrane.

1. Reverse osmosis
2. Diffusion
3. Osmosis
4. Active diffusion

Q. determination of oxygen carried by hb is done by
ph
pressure of o2
pressure of co2
all
here ans is only 2
is it correct?

Q.

how does blood circulate in earthworm ?

explain in detail. what are the functions of commissural and subneural vessels in earthworm ?

Q.

why water potential is the sum of the pressure and solute potential

Q.

Assertion : In diffusion, molecules move in a random fashion.

Reason : Diffusion can be both uphill and downhill.

1. if both A and R are true and R is the correct explanation of A

2. if both A and R are true but R is not the correct explanation of A

3. if A is true but R is false

4. if both A and R are false.

Q.

Mention the components of diffusion membrane of human respiratory system?

Q.

Plants absorb substances such as nitrate ions by active uptake from the soil. What do you mean by active uptake?

Q.

What are the factors affecting the rateof diffusion?

Q. with the help of simple diffusion glucose and amino acids are absorbed then why active transport occurs ?

Q. if solute potential is constant in a system or not given(in a question), then could we relate pressure potential with with water potential as
"more positive the pressure potential more will be the water potential of the system or more will be the free energy of water to diffuse to a system having low pressure potential(less positive or negative)"