Universal Structures in Plant Epidermal Cells

Steps:

• Recall that all plant cells share basic eukaryotic features like cell walls and nuclei.
• Note that epidermal cells form the outer layer but vary by location (e.g., leaves vs. roots).
• Eliminate options with non-universal structures like chloroplasts or starch grains.
• Confirm the pair present in every plant cell type, including epidermis.

Why B is correct:

• All plant cells, including epidermal ones, have a rigid cell wall for support and a nucleus as the eukaryotic control center, per basic cell biology definitions.

Why the others are wrong:

• A: Chloroplasts are absent in non-photosynthetic epidermal cells, like those in roots.
• C: Chloroplasts are not universal in epidermis; starch grains are storage structures not present in all cells.
• D: Starch grains are not found in every epidermal cell, only in those actively storing energy.

Final answer: B