CO2 Diffuses Out of Plant Cells During Respiration

Steps:

• Aerobic respiration in plant cells produces CO2 as a waste product inside the cell via glucose + O2 → CO2 + H2O + ATP.
• CO2 concentration is higher inside the cell than outside, so it moves outward by passive diffusion.
• Diagrams likely show directional arrows; outward arrows indicate CO2 exit.
• Option D matches this with arrows pointing from cell interior to exterior.

Why D is correct:

• CO2 follows Fick's law of diffusion, moving down its concentration gradient from high (inside) to low (outside) the cell.

Why the others are wrong:

• A shows inward arrows, representing O2 intake, not CO2 exit.
• B shows no directional movement, failing to depict diffusion.
• C shows circular or internal flow, not outward diffusion.

Final answer: D