Question 52
Under what conditions are $C_{4}$ plants superior to $C_{3}$ ?

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Solution

$C_{4}$ plants are advantageous in following ways
(i) These plants can carry out photosynthesis even at low concentration of $C O_{2}$ in the atmosphere and in the shortage of water.
(ii) These plants can tolerte high $O_{2}$ concentration an temperature as enzyme PEP carboxylase in $C_{4}$ cycle in insensitive to $O_{2}$ and do not show-photorespiration in comparison to the $C_{3}$ plants, which start process of photorespiration and lose $C O_{2}$ fixation in the form of glucose molecule.
Thus, $C_{4}$ plants are superior to $C_{3}$ plants.

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Question 09
PEP is primary $C O_{2}$ acceptor in
(a) $C_{4}$ plants (b) $C_{3}$ plants
(c) $C_{2}$ plants (d) both $C_{3} a n d C_{4}$ plants

C_{4}

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