Question

Which phase of growth involves rapid cell enlargement?

• A. Meristematic phase
• B. Elongation phase
• C. Maturation phase
• D. Senescence phase Correct Answer: (B) Elongation phase

Hint:

To easily remember the sequence and core features of these zones, think of it as a factory production line: 1. Meristematic $\implies$ The Manufacturing phase (making new raw cells). 2. Elongation $\implies$ The Stretching phase (inflating cell size via vacuoles). 3. Maturation $\implies$ The Specialization phase (hardening walls and assigning permanent jobs).

Answer 1

The Correct Option is B

Step 1: Recall the three growth zones.
Behind a root or shoot tip there are three regions. First division, then elongation, then maturation.

Step 2: Match rapid enlargement.
In the elongation zone the new cells soak up a lot of water into their vacuoles. This water pushes the cell to swell fast and get longer. That is the rapid enlargement asked about.

Step 3: Why not the others.
The meristematic phase only makes new cells by division. The maturation phase fixes the cell into its final form. Senescence is the dying stage. None of these means rapid swelling.

Step 4: Final choice.
Rapid cell enlargement happens in the elongation phase, option 2.
\[ \boxed{\text{Elongation phase}} \]