A- The C_3 and C_4 plants respond differently | vedclass

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(A) is correct: $C_3$ plants show increased photosynthesis with higher $CO_2$ levels,whereas $C_4$ plants show saturation at much lower levels of $CO_

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$A$ and $R$ both are correct.

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(A) is correct: $C_3$ plants show increased photosynthesis with higher $CO_2$ levels,whereas $C_4$ plants show saturation at much lower levels of $CO_2$.$R$ is correct: The current atmospheric concentration of $CO_2$ is $0.03-0.04$ percent. An increase in concentration up to $0.05$ percent (or $500 \ ppm$) leads to an increase in $CO_2$ fixation rates in many plants,particularly $C_3$ plants.

$A-$ The $C_3$ and $C_4$ plants respond differently to $CO_2$ concentrations.
$R -$ The concentration of $CO_2$ in the atmosphere is between $0.03$ and $0.04$ percent. An increase in concentration up to $0.05$ percent can cause an increase in $CO_2$ fixation rates.

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$A-$ The $C_3$ and $C_4$ plants respond differently to $CO_2$ concentrations.$R -$ The concentration of $CO_2$ in the atmosphere is between $0.03$ and $0.04$ percent. An increase in concentration up to $0.05$ percent can cause an increase in $CO_2$ fixation rates.