Gaseous Exchange in Plants

Q. What is the effect of carbon dioxide on the rate of respiration in plants?

1. Carbon dioxide has no effect on respiration rate
2. Rate of respiration in plants increases with increase in $C{O}_2$ concentration
3. Rate of respiration in plants decreases with increase in $C{O}_2$ concentration
   
4. Rate of respiration first increases then decreases with increase in $C{O}_2$ concentration
   

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

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

Q. Plants carry out gas exchange through ___ .

1. Stomata
2. Lenticels
3. Mesophyll cells
4. Vascular system

Q. Assertion: Plants can live without special respiratory organs.
Reason: Every living cell in the plant is present very close to the plant surface which facilitates easy exchange of gases. Also, oxygen availability is not an issue since oxygen is produced during photosynthesis.

1. Both assertion and reason are correct statements and reason is the correct explanation
2. Both assertion and reason are correct statements but the reason is incorrect explanation
3. Assertion is an incorrect statement but the reason is a correct statement
4. Both are incorrect statements