Assertion :The atmospheric concentration of $C O_{2}$ at which photosynthesis just compensates for respiration is referred to as $C O_{2}$ compensation point. Reason: The $C O_{2}$ compensation point is reached when the amount of $C O_{2}$ uptake is less than that generated through respiration, because the level of $C O_{2}$ in the atmosphere is more than that required for achieving $C O_{2}$ compensation point.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
The compensation point is the amount of light intensity on the light curve where the rate of photosynthesis exactly matches the rate of respiration. At this point, the uptake of CO $_{2}$ through photosynthetic pathways is exactly matched to the respiratory release of carbon dioxide. Thus, assertion and reason are wrong.
Therefore, the correct answer is option D.

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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