What is the special feature of the leaves of c4 plants?
a. they contain chloroplasts both in the mesophyll and bundle sheath cells.
b. they contain chloroplasts only in the mesophyll cells.
c. they contain chloroplasts only in the bundle sheath cells.

Your answer is A.They contain chloroplasts both in the mesophyll and bundle sheath cells.

Explanation:

 C4 plants have two types of photosynthetic cells: mesophyll and bundle sheath cells. Mesophyll chloroplasts are randomly distributed along cell walls, whereas bundle sheath chloroplasts are located close to the vascular tissues or mesophyll cells depending on the plant species. The cell-specific C4 chloroplast arrangement is established during cell maturation, and is maintained throughout the life of the cell.

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b is the best answer for this question.