Matching plant part functions to labels

Steps:

• Examine the diagram to identify label 1 as leaf mesophyll, where photosynthesis occurs via chlorophyll capturing light.
• Identify label 2 as xylem tissue, which transports water and minerals upward from roots.
• Identify label 4 as stomata on the leaf surface, enabling gaseous exchange of CO2 and O2.
• Confirm the sequence matches standard plant structure functions, excluding label 3 (likely phloem for sucrose).

Why D is correct:

• D assigns photosynthesis to 1 (mesophyll definition: site of light-dependent reactions), water transport to 2 (xylem law: cohesion-tension theory pulls water upward), and gaseous exchange to 4 (stomata function: diffusion gradient for gas entry/exit).

Why the others are wrong:

• A misassigns gaseous exchange to 1, but 1 is photosynthetic tissue, not epidermal pores.
• B places photosynthesis first correctly but swaps water and sucrose transport, ignoring xylem's water-specific role.
• C starts with gas exchange for 1 and inverts water/sucrose, contradicting tissue specializations.

Final answer: D