Question

Which of the following is an example of osmosis?

• A. uptake of water by root hair
• B. exchange of gases in stomata
• C. swelling of seed when put in soil
• D. opening of stomata

Answer 1

The correct option is (A) and (D):

Explanation of the correct options:

Option (A):

1. Osmosis is the movement of liquid molecules from a higher concentration to a lower concentration through a partially permeable membrane.
   
2. An example of osmosis can be the intake of water molecules through the root hairs present inside the soil.
   
3. The osmosis allows the movement of water from the soil
   

Option (D):

1. The swelling of seed is another example of osmosis where water enters the seed in the soil to help it germinate.​

Explanation of the incorrect options:

Option (B):

1. The exchange of gases through the stomata occurs through diffusion.
   
2. Gases diffuse between the atmosphere and inside the plant.
   

Option (C):

1. ​Opening and closing of stomata occurs due to turgor pressure.
   
2. The guard cells control the opening and closing of the stomata and the turgor pressure controls it.
   

Final Answer: Uptake of water by root hair and swelling of seed when put in soil are examples of osmosis.