Identifying epidermal trichomes in plant stems

Steps:

• Observe the outer layer of the organ for epidermal cells.
• Identify unicellular extensions projecting from the epidermis.
• Confirm these as trichomes, characteristic of stem or leaf surfaces.
• Rule out internal tissues like xylem or endodermis based on position.

Why C is correct:

• Trichomes are unicellular hair-like extensions of epidermal cells, providing protection and reducing water loss in plant organs like stems.

Why the others are wrong:

• A: Central region in stems contains pith (parenchyma), not primary supporting tissue like sclerenchyma.
• B: Endodermis forms a single layer inside the cortex, surrounding vascular tissue, not at the organ's edge.
• D: In stems, xylem occurs in vascular bundles near the periphery, not densest at the center.

Final answer: C