Diffusion

Q.

Write ten examples of diffusion in everyday life.

Q. Discuss the process of absorption of water by root hairs.

Q.

Write two examples of diffusion.

Q. Name the tiny pores present in the leaves of the plants for exchange of gases.

1. Stomata
2. Spiracles
3. Tracheae
4. Chloroplast

Q.

Difference between osmosis and diffusion

Q.

Odour spreads from one room to another by the process of

1. Separation

2. Diffusion

3. Osmosis

4. Expansion

Q. Rate of diffusion across cell membrane depends upon

1. Size of the substances

2. Solubility in lipids

3. Living system

4. Both a & b

Q.

Which of the following statements are wrong?
(i) The mass flow of substances inside the plant is the result of pressure differences between the two points
(ii) Diffusion cannot account for long distance movement of water and solutes in plants
(iii) Movement through apoplast does not involve crossing the cell membrane
(iv) The movement of water through endodermis is only through symplast

1. (i)
2. none
3. (ii)
4. (iii)

Q. Which of the following blood vessel carries carbon dioxide rich blood from heart to the lungs?

1. Aorta
2. Pulmonary artery
3. Pulmonary vein
4. Capillaries

Q. How do fish and aquatic plants survive in water ?

Q.

Diffusion that occurs through carrier proteins is

1. Facilitated diffusion

2. Simple diffusion

3. Passive diffusion

4. Active diffusion

Q.

Movement of water through xylem and food through phloem is made possible by osmosis. True or false?

1. True

2. False

Q.

Which of the following conditions is true, when carbon dioxide diffuses out from the blood into the air inside the alveoli?

1. The concentration of carbon dioxide is higher in blood.

2. The concentration of carbon dioxide is higher in the air.

3. The concentration of carbon dioxide is the same in blood and air.

4. Nothing can be said about the concentration of carbon dioxide.

Q.

Explain diffusion with the help of two examples

Q.

The small pores which are responsible for the exchange of oxygen and carbon dioxide in plants are mainly present on the ___ of plants.

1. Stomata

2. Pores

3. Chlorophyll

4. Leaves

Q.

Identify P, Q & R in the figure.

1. P - Antiport, Q - Symport, R - Uniport

2. P - Uniport, Q - Symport, R - Antiport

3. P - Uniport, Q - Antiport, R - Symport

4. P - Symport, Q - antiport, R - Uniport

Q. Select the correct statements about facilitated diffusion.

1. There is a specific protein carrier for a specific substance to be transported.
2. The same protein carrier transports all the substance through the membrane.
3. There is no limit to the rate of transport of a substance by facilitated diffusion.
4. The rate of transport is limited by saturation, i.e. when all protein carrier molecules are being used.

Q. Which among the following are the functions of a circulatory system?

1. Remove urea
2. Remove $CO2$
3. Produce hormone
4. Carry hormones
5. Control memory
6. Transport $O2$
7. Kill blood cells
8. Clot blood

Q.

Paheli rooted a rose plant from the soil most of the root tips with root hair got left Behind in the soil she planted it in a pot with new cell and water it regularly will the plant grow or die give reason for your answer?

Q.

Identify the incorrect statement related to facilitated diffusion.

1. Transport rate reaches saturation

2. Substances are transported without the use of ATP

3. Cause net transport of molecules from low to high concentration

4. Very specific and selective to substances

Q. In plants, gaseous exchange occurs through the process of:

1. Diffusion
2. Osmosis
3. Active transport
4. None of the above

Q.

Carbon dioxide moves out of blood and into the alveolus while oxygen moves into the blood from the alveolus. Why does it happen so?

1. The concentration of oxygen and carbon dioxide is higher in alveolus compared to incoming blood.

2. The concentration of oxygen and carbon dioxide is lower in alveolus compared to incoming blood.

3. The concentration of oxygen is higher and carbon dioxide is lower in alveolus compared to incoming blood.

4. The concentration of oxygen is lower and carbon dioxide is higher in alveolus compared to incoming blood.

Q.

Arrange the following activities in the order of the speed in which they take place.
(i) Movement of mimosa when it is touched.
(ii) Movement of sunflower in response to day and night.
(iii) Growth – related movements of plants.

1. (ii) – (iii) – (i)

2. (i) – (ii) – (iii)

3. (iii) – (ii) - (i)

4. (iii) – (i) – (ii)

Q. Odour spreads from one room to another by the process of:

1. Separation
2. Diffusion
3. Osmosis
4. Expansion

Q.

The movement of substances from a region of higher concentration to a region of lower concentration is called __________ .

1. Diffusion

2. Breathing

3. Transpiration

4. Pressure

Q.

Active transport through the plasma membrane occurs through the action of ___.

1. diffusion

2. membrane proteins

3. DNA

4. water

Q. Why do plants not need a respiratory system?

Q.

What characteristic is shared by simple diffusion and facilitated diffusion?

1. Both require cellular energy for the transport of substances.

2. Both involve the movement of a substance from regions of a higher concentration to lower concentration without cellular energy

3. Both involve the movement of water across a semipermeable membrane.

4. Both require a special carrier molecule to move substances across the membrane.

Q.

The movement of substances from a region of higher concentration to a region of lower concentration is called __

Q.

During diffusion of carbon dioxide between blood and air, which of the following condition is true?

1. The concentration of carbon dioxide is the same in blood and air

2. Nothing can be said about the concentration of carbon dioxide

3. The concentration of carbon dioxide is higher in blood

4. The concentration of carbon dioxide is higher in air