Chloroplasts Enable Photosynthesis in Specific Leaf Cells

Steps:

• Identify chloroplasts as organelles for photosynthesis, present in cells exposed to light.
• Exclude epidermal cells (1), which form the outer layer for protection without chloroplasts.
• Include guard cells (2), which contain chloroplasts to produce energy for stomatal opening.
• Include palisade mesophyll cells (3), packed with chloroplasts for maximum light absorption.
• Include spongy mesophyll cells (4), which have chloroplasts for gas exchange and photosynthesis.

Why C is correct:

• Guard, palisade, and spongy mesophyll cells perform photosynthesis, requiring chloroplasts as defined by plant cell specialization.

Why the others are wrong:

• A includes epidermal cells (1), which lack chloroplasts for protective function.
• B omits mesophyll cells (3 and 4), primary sites of photosynthesis.
• D excludes spongy mesophyll (4), which contain chloroplasts despite air spaces.

Final answer: C