The correct option is Both A and R are true but R is NOT the correct explanation of A
Explanation
Plant growth involves distinct phases, including cell division, cell enlargement, and differentiation. Water is critical to plant life, serving both as a physical driving force for growth and a chemical medium for metabolism.
Statement-wise Analysis:
- Assertion (A): Correct. Cell enlargement (extension growth) is primarily driven by turgor pressure. As water enters the cell, it creates hydrostatic pressure that pushes the plasma membrane against the cell wall. This pressure stretches the cell wall, leading to an increase in cell size and volume.
- Reason (R): Correct. Water is essential for all physiological activities in plants. It acts as a solvent for nutrients and provides the necessary medium for enzymatic reactions (metabolism) to take place.
Justification for Both A and R are true but R is NOT the correct explanation of A
While both statements are scientifically accurate, the Reason (R) is not the correct explanation for the Assertion (A). The Assertion refers to the mechanical role of water (turgor pressure) in physically stretching the cell. The Reason refers to the biochemical role of water (medium for enzymes). The general necessity of water for enzymatic reactions does not explain the specific physical mechanism of turgor-driven cell expansion.
Key Takeaway:
Turgor pressure is the physical force responsible for cell enlargement, distinct from water's general role as a medium for enzymatic and physiological activities.