Question

By looking at a plant externally can you tell whether a plant is C3 or C4? Why and how?? ​

Answer 1

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✨It is not possible to distinguish externally between C3 and C4 plants but generally tropical plants are adapted for C4 cycle.

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Answer 2

To tell whether a plant is C3...the bundle sheaths dont contain chloroplast unlike in C4 which have chloroplast. - my answer

You cannot really tell if a plant is C3 or C4 by observing its leaves and other morphological features externally. Unlike C3 plants, the leaves of C4 plants have a special anatomy called Kranz anatomy and this difference can only be observed (looked at) at the cellular level. For example, although wheat and maize are grasses, wheat is a C3 plant, while maize is a C4 plant. - i got this from a website to back up my answer but home it helps   : )