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1. By looking at a plant externally can you tell whether a plant is  C_{3} or C_{4} ? Why and how?

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External morphology does not necessarily differentiate C_{3} plants from C_{4} plants. The C_{4} leaves are isobilateral but all isobilateral leaves are not C_{4} in nature. Anatomically,  C_{3} plants can be differentiated from C_{4} plants as  C_{4} plants possess leaves with Kranz anatomy

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