By looking at a plant externally can you tell whether a plant is `C_(3) "or "C_(4)` ? Why and how?

By looking at which internal structure of a plant can you tell whether a plant is C_(3) "or " C_(4) ? Explain .

C_(3) plants and C_(4) plants

Compared to C_(3) plants, C_(4) plants

The C_(4) - plants are

A process that makes important difference between the C_(3) & C_(4) plant is

What are the steps that are common to C_(3) and C_(4) plants.

Secondary acceptor of CO_(2) in C_(4) plants is

This is not a C_(3) plant

From what you have leartn, can you tell whether enzymes are bigger or DNA is bigger in molecular size ? How did you know?

Plants showing C_(4) photosynthesis have