Question
Give comparison between the following: $C_3$ and $C_4$ pathways
| $C_3$ Pathway | $C_4$ Pathway | ||
| i. | In the $C_3$ pathway, the first product of carbon fixation is a 3 carbon atom compound 3-phosphoglyceric acid. | i. |
In the $C_4$ pathway, the first product of carbon fixation is oxaloacetic acid, a 4 carbon atom compound.
|
| ii. | Photorespiration occurs in $C_3$ plants. | ii. | Photorespiration rarely occurs. |
| iii. | Plants are adapted to all climates except saline conditions. | iii. | Plants are adapted to tropical climate and can tolerate halophytic conditions. |
| iv. | This pathway is less expensive and requires only 18 molecules of ATP for the synthesis of one molecule of glucose. | iv. | This pathway is more energy expensive and requires 30 molecules of ATP for the synthesis of one molecule of glucose. |
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