C4-plants show Kranz anatomy. In the leaves of C4-plants, the vascular bundles are surrounded by bundle sheath of parenchymatous cells, which in turn are surrounded by mesophyll cells. Chloroplasts in bundle sheath cells are larger and always contain grana whereas chloroplasts in mesophyll cells are smaller. The C4-plants are photosynthetically more efficient than C3-plants because they have more chloroplasts. Photorespiration takes place only in C3-plants. It occurs in chlorophyllous tíssue. At high temperature and high oxygen concentration the affinity of RuBP carboxylase for CO2 decrease and for O2 increases. Photosynthesis takes CO2 and release O2, while respiration utilizes O2 and release CO2. If the light factor is saturating, there will be certain concentration of CO2 in the atmosphere at which the rate of photosynthesis will be equal to rate of respiration. This is called carbon dioxide compensation point. C4-plants have very low CO2 compensation point
The C_4-plants are photosynthetically more efficient than C_3-plants because
NEET UG 2008 — Botany Photosynthesis in Higher Plants
The C4-plants are photosynthetically more efficient than C3-plants because
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
the CO2 compensation point is more
- B
CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
- C
the CO2 efflux is not prevented
- D
they have more chloroplasts
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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. 
How many molecules of ATP and NADPH are required for every molecule of $\mathrm{CO}_2$ fixed in the Calvin cycle?
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:
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