Assertion :Efficiency of $C_{4}$ plants is more than that of $C_{3}$ plants. Reason: $C_{4}$ plants are more efficient in capturing $C O_{2}$ .

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The efficiency of $C_{4}$ plants is more than that of $C_{3}$ plants because $C_{4}$ plants lack photorespiration. They overcome photorespiratory losses by having a mechanism that increases the concentration of $C O_{2}$ at the enzyme site. During the $C_{4}$ pathway, when the $C_{4}$ acid from the mesophyll cells is broken down in the bundle sheath cells, it releases $C O_{2}$ - this results in increasing the intracellular concentration of $C O_{2}$ . This, in turn, ensures that the RuBisCO functions as a carboxylase minimizing the oxygenase activity. So, $C_{4}$ plants are more efficient in capturing $C O_{2}$ . Thus, the correct answer is option A.

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Similar questions

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: The efficiency of $C_{4}$ plant is more than those of $C_{3}$ plant.
Reason : $C_{4}$ plants are more efficient in picking $C O_{2}$

Q. Given below are assertion and reason. Point out if both are true with the reason being a correct explanation (A), both true but the reason is not correct explanation (B), the assertion is true but the reason is wrong (C) and both are wrong (D).

Assertion.

C_{4}

photosynthetic pathway is more efficient than

C_{3}

pathway.
Reason. Photorespiration is suppressed in

C_{4}

plants.

Q. Assertion: C4 pathway of CO₂ fixation is found in some tropical plants,
Reason: In this pathway, CO₂ is fixed by 3 C compound

In the following question, a statement of assertion is following by a statement of reason. Mark the correct choice as:
Assertion: CAM plants lack structural compartmentation of a leaf as found in $C_{4}$ plants.
Reason: Stomata of CAM plants are open during the day.

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Assertion :Efficiency of C4 plants is more than that of C3 plants. Reason: C4 plants are more efficient in capturing CO2.

Assertion :Efficiency of $C_{4}$ plants is more than that of $C_{3}$ plants. Reason: $C_{4}$ plants are more efficient in capturing $C O_{2}$ .