give the basis of categorize the green plants according to the first stable organic compound produced during photosynthesis . how will you place gram maize and sugarcane under these categories
Answers
Answer:
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Explanation:
According to the first stable organic compound produced during photosynthesis plants are classified into two groups:
1. C3plants
2. C4plants
The basis of this classification is the first stable product formed.
C3 plants involve Calvin cycle or C3 cycle also known as dark reaction because no direct light is required for this process.
C3 plants:
Calvin cycle takes place in mesophyll cells
Initial carboxylation occurs in mesophyll cells
Primary CO2 acceptor is RuBP (riboluse biphosphate)
5C present in RuBP
3C present in primary fixation product
Primary fixation product is PGA phosphogyceric acid
Plant have Rubisco in mesophyll cells
Medium CO2 fixation under high light conditions
Photo respiration present at high temperature
20–25°C temperature optimum
Examples wheat , rice
C4 plants
Calvin cycle takes place in bundle sheath cells
Kranz anatomy present ( green bundle sheath cells around vascular bundles, dimorphic chloroplasts present, BS cells are larger and without grana)
Carboxylation occurs in mesophyll cells.
Primary acceptor of CO2 is OAA (oxalo acetic acid)
4C present in OAA
Plant have Rubisco in bundle sheath cells
CO2 fixation rate is high under high light conditions
Photo respiration negligible at high light intensities
Negligible photo respiration present at high CO2 concentrations
Temperature optimum 30–40°C
Examples are maize sugarcane sorghum