Difference Between C3 Plants and C4 Plants:
The following are the points of difference between C3 plants and C4 plants–
|C3 plants||C4 plants|
|They are mainly temperate plants.||They are mainly tropical plants.|
|They operate only the Calvin cycle.||They operate the Calvin cycle as well as the Hatch and Slack pathway.|
|The optimum temperature for photosynthesis is 20°-25°C.||The optimum temperature for photosynthesis is 30°-45°C.|
|The transpiration ratio is 500-1000.||The transpiration ratio is 250-350.|
|CO₂ fixation takes place in mesophyll cells only.||CO₂ fixation takes place in mesophyll and bundle sheath.|
|Chloroplasts are granal (one type).||Chloroplasts are of two types (granal and agranal).|
|Chloroplasts are without peripheral reticulum.||Chloroplasts posses a peripheral reticulum.|
|Leaves do not show kranz anatomy.||Leaves show kranz anatomy.|
|They perform photorespiration.||Photorespiration is not detectable.|
|The first acceptor of CO₂ is RuBP.||The first acceptor of CO₂ is PEP while the second acceptor is RuBP.|
|The first stable compound after carboxylation is PGA (phosphoglyceric acid).||The first stable compound after carboxylation is OAA (oxaloacetic acid).|
|PGA is reduced in the chloroplasts where it is formed.||PGA is formed in bundle sheath cells but is reduced in mesophyll cells.|
|The carboxylase enzyme is Rubisco.||The carboxylase enzyme is PEP carboxylase and Rubisco.|
|18 ATPs used to synthesize one glucose.||Consumes 30 ATPs to produce one glucose.|
|CO₂ compensation point lies between 50-100 ppm.||CO₂ compensation point lies between 0-10 ppm.|
|Example: Paddy, Wheat, Potato, and so on.||Example: Sugar cane, Maize, Sorghum, Amaranthus, and so on.|
- Define Photosynthesis. Write down the importance of Photosynthesis
- What Are Plant Auxins? Discuss the role of Auxins (IAA) in the plant body?
- What Are Gibberellins? Discuss the functions of Gibberellins in the plant body?
- What Are Cytokinins? Discuss the functions of Cytokinins in the plant body?
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