By looking at a plant externally can you tell whether a plant is C³ or C ⁴? Why and how?
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One can distinguish whether a plant is C3 or C4 by observing its leaves and other morphological features externally. Unlike C3plants, the leaves of C4 plants have a special anatomy called Kranz anatomy and this difference can only be observed at the cellular level. For example, although wheat and maize are grasses, wheat is a C3 plant, while maize is a C4 plant.
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Explanation:
C3 pathways
The primary acceptor of CO₂ is RUBP - a six-carbon compound.
The first stable product is 3 phosphoglycerate.
It occurs only in the mesophyll cells of the leaves.
It is a slower process of carbon fixation and photo-respiratory losses are high.
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C4 pathways
The primary acceptor of CO₂ is 1. phosphoenol pyruvate carbon compound. a three
2.
The first stable product oxaloacetic acid. IS
It occurs in the mesophyll and bundle-sheath cells of the leaves.
It is a faster process of carbon 4. fixation and losses are low. photo-respiratory
3.
1
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