Question

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

• A. Increasing atmospheric $C{O}_2$ concentration upto $0.05$% can enhance $C{O}_2$ fixation rate
• B. $C_3$ plants respond to higher temperatures with enhanced photosynthesis while $C_4$ plants have much lower temperature optimum
• C. Tomato is a greenhouse crop which can be grown in $C{O}_2$ - enriched atmosphere for higher yield
• D. Light saturation for $C{O}_2$ fixation occurs at $10\%$ of full sunlight

Answer 1

The correct option is B $C_3$ plants respond to higher temperatures with enhanced photosynthesis while $C_4$ plants have much lower temperature optimum

With reference to factors affecting the rate of photosynthesis, all the given statements are true except statement 2.
$C_3$ plants are generally found in temperate conditions and cannot tolerate high temperatures.
Where as $C_4$ plants have adapted to tolerate high temperatures and drought conditions.