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BIO NMDCAT CELL STRUCTURE & FUNCTION
nmdcat.online July 3, 2026

99. The biochemical mechanism by which the plant cell wall stretches during growth without snapping involves a localized drop in the apoplastic pH to approximately 4.5. This acidification activates wall-loosening enzymes, a phenomenon described as the

A. Induced-fit theory
B. Acid-Growth Hypothesis
✓
C. Fluid Mosaic model
D. Chemiosmotic coupling theory

📝 Explanation

Auxin stimulates proton pumps to drive H+ into the cell wall; the resulting drop in pH activates expansins, loosening the wall to allow turgor-driven growth.

📖 Additional Information

  • Induced-fit theory
  • Acid-Growth Hypothesis
  • Fluid Mosaic model
  • Chemiosmotic coupling theory

Auxin stimulates proton pumps to drive H+ into the cell wall; the resulting drop in pH activates expansins, loosening the wall to allow turgor-driven growth.

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