Question

Which meristem helps in increasing the girth of the plant? ____.

• A. Primary meristem
• B. Apical meristem
• C. Intercalary meristem
• D. Lateral meristem

Hint:

Remember the directions of growth: - Apical & Intercalary = Vertical growth (Up and Down Length). - Lateral = Horizontal growth (Sideways Girth).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Meristematic tissues are classified based on their position in the plant body into apical, intercalary, and lateral meristems, each serving a distinct growth role.

Step 2: Detailed Explanation:

• Lateral Meristem: These meristems occur in the mature regions of roots and shoots and run parallel to the long axis of the plant organ. They divide periclinally to produce secondary tissues, which directly increases the girth (thickness/diameter) of the plant. Examples include vascular cambium and cork cambium.
• Apical Meristem: Found at the tips of roots and shoots; helps in increasing the length of the plant (primary growth).
• Intercalary Meristem: Found between mature tissues (e.g., at the base of leaves or internodes in grasses); helps regenerate parts removed by grazing herbivores.

Step 3: Final Answer:
The lateral meristem helps in increasing the girth of the plant.