Functions of leaf regions in transverse section

Steps:

• Examine standard leaf anatomy: outer layer with stomata for gas exchange (region 1).
• Locate central vascular bundles (xylem/phloem) for water/mineral and sugar transport (region 2).
• Identify inner mesophyll cells with chloroplasts for photosynthesis (region 3).
• Match sequence to option C: gas exchange, transport, photosynthesis.

Why C is correct:

• Leaf stomata enable CO2/O2 exchange, veins conduct fluids, and mesophyll performs light-dependent reactions per photosynthetic pathway.

Why the others are wrong:

• A: Misorders regions; photosynthesis is not outer gas exchange layer.
• B: Starts with transport, but vascular tissue is internal, not first region.
• D: Repeats transport but swaps gas exchange and photosynthesis incorrectly.

Final answer: C