Question

Choose the correct option

i) Both assertion and reason are true and reason is correct explanation of the assertion

ii) Both assertion and reason are true but reason is not the correct explanation of the assertion

iii) Assertion is true but reason is false

iv) Assertion is false but reason is true


Assertion:- Carbon dioxide and oxygen move across the cell membrane by a process called diffusion

Reason:- This movement is due to cell’s affinity towards gases

Answer 1

Answer:

option i) is correct

Explanation:

carbon di oxide and oxygen will diffuse in and out through stomata found in lower part of leaf.

the reason is correct

its becoz of affinity toward gases

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Answer 2

Answer:

Option iii) Assertion is true but the reason is false is correct.

Explanation:

• Diffusion refers to the spontaneous movement of molecules from the region of their high concentration to their region of lower concentration i.e. down the chemical potential gradient.

• It is a passive process and needs no energy consumption. And this is why gases such as carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by this process.

• CO₂ is produced by all cells as a result of cellular metabolic processes. Since the source is inside the cell, the concentration gradient is constantly being replenished/re-elevated, thus the net flow of CO₂ is out of the cell.

• Metabolic cycles in animals and plants typically require oxygen, which is in a lower concentration inside the cell, in this manner the net progression of oxygen is into the cell.

It is important to know that gases possess the following properties for which they can diffuse and perform a gaseous exchange on the respiratory surface or in the body tissues.

(i) Gas molecules, whether in a pure state or the mixture, are in a state of constant motion.

(ii) Gas molecules spread uniformly throughout the container and exert pressure on its walls.

(iii) Gases diffuse according to concentration gradient i.e., from an area of higher concentration to an area of lower concentration.

• Hence it is the difference in a gradient which makes the gases diffuse not the affinity of cells.

Therefore option iii) Assertion is true but the reason is false fits well here.

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