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Mention the significances of C4 cycle....

Mention the significances of `C_4` cycle.

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(i) Plants having `C_4` cycle are mainly of tropical and sub-tropical regions and are able to survive in environment with low `CO_2` concentration.
(ii) `C_4` plants are partially adapted to drought conditions.
(iii) Oxygen has no inhibitory effect on `C_4` cycle since PEP carboxylase is insensitive to `O_2`.
(iv) Due to absence of photorespiration, `CO_2` Compensation Point for `C_4` is lower than that of `C_3` plants.
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