Chloroplasts in leaf mesophyll cells

Steps:

• Identify leaf structure: green leaves have epidermis (protective, no chloroplasts) and mesophyll (photosynthetic, with chloroplasts).
• Locate cell types: brackets label layers; mesophyll includes palisade (compact, upper) and spongy (loose, lower) cells.
• Recall function: chloroplasts enable photosynthesis in mesophyll for light absorption.
• Match to diagram: W and Z represent palisade and spongy mesophyll.

Why D is correct:

• Mesophyll cells (W and Z) contain chloroplasts, as defined in plant anatomy for photosynthesis in green tissues.

Why the others are wrong:

• A: X is epidermis, lacking chloroplasts for protection, not photosynthesis.
• B: Y is likely vascular or epidermis, without chloroplasts.
• C: Neither W nor Z alone covers both mesophyll types; excludes key layer.

Final answer: D