A. Guard cells
A.
B. Xylem cells
B.
C. Phloem cells
C.
D. Palisade cells
D.
Correct Answer: D
সঠিক উত্তর: D
Explanation
ব্যাখ্যা
Palisade cells are located in the upper layer of leaves and are packed with chloroplasts, making them the primary site of photosynthesis in plants.