Question
Compare C3 and C4 plants on various parameters.
| Comparison of C3 and C4 Plants | ||
| Characteristics | C3 Plants | C4 Plants |
| Cell type in which the Calvin cycle takes place | Mesophyll | Bundle sheath |
| Cell type in which initial Carboxylation takes place | Mesophyll | Mesophyll |
| How many cells does the leaf have that fix CO2 | 1; Mesophyll | 2; Mesophyll, bundle sheath |
| Number of carbons in primary CO2, acceptor | 3 | 3 |
| Primary CO2 fixation product | 3 phosphoglyceric acid | Oxaloacetic acid |
| No. of carbons in primary CO2 fixation product | 3 | 4 |
| Presence of RuBisCO | yes | yes |
| Presence of PEPcase | yes | yes |
| Cells having RuBisCO | Mesophyll | Bundle Sheath |
| CO2 fixation rate under highlight conditions | No | yes |
| Presence of photorespiration at low light intensities | No | No |
| Presence of photorespiration at High light intensities | yes | No |
| Presence of photorespiration at low CO2 concentration | yes | No |
| Presence of photorespiration at high CO2 concentration | No | No |
| Temperature optimum | 20-25 degree C | 30-40 degree C |
| Examples | Mango, guava | Maize, cactus |
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| Column I | Column II | ||
| a. | Chlamydomonas | i. | Moss |
| b. | Cycas | ii. | Pteridophyte |
| c. | Selaginella | iii. | Algae |
| d. | Sphagnum | iv. | Gymnosperm |