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

Question

TextC4 Pathway of Photosynthesis (Hatch-Slack Pathway)

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By looking at which internal structure of a plant you can tell whether a plant is C3 or C4? Explain.

Even though a very few cells in a C4 plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?