In C3 plants, photosynthesis is decreased at higher temperatures due to increased photorespiration. C4 Plants have a higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
Held on 30 Apr 2017 · Verified 9 Jul 2026.
Light saturation for CO2 fixation occurs at 10% of full sunlight
Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate
C3 plants respond to higher temperatures with enhanced photosynthesis, while C4 plants have a much lower temperature optimum
Tomato is a greenhouse crop that can be grown in CO2 - enriched atmosphere for a higher yield
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Match List I with List II: $\begin{array}{|l|l|l|l|}\hline & \text{List - I} & & \text{List - II} \\\hline \text{A}. & \text{Chlorophyll a} & \text{(i)} & \text{Yellow-green} \\\hline \text{B.} & \text{Chlorophyll b} & \text{(ii)} & \text{Yellow} \\\hline \text{C.} & \text{Xanthophylls} & \text{(iii)} & \text{Blue-green} \\\hline \text{D.} & \text{Carotenoids} & \text{(iv)} & \text{Yellow to Yellow-orange} \\\hline\end{array}$ Choose the option with all correct matches.
Which of the following statements about RuBisCO is true?
Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option. 
Which one of the following products diffuses out of the chloroplast during photosynthesis?
Given below are two statements: Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to RuBisCO, hence $\mathrm{CO}_2$ fixation is decreased. Statement II: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. In the light of the above statements, choose the correct answer from the options given below:
Work through every NEET UG Photosynthesis in Higher Plants PYQ, year by year.