Question

Consider the following statements:
Assertion (A): The middle lamella is a first formed layer of cell wall.
Reason (R): The middle lamellum develops from cell membrane during cell division.

• A. Both (A) and (R) are true, (R) is the correct explanation of (A)
• B. Both (A) and (R) are true, (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

{Cell Wall Layers Order (Outside to Inside):} Middle Lamella $\rightarrow$ Primary Wall $\rightarrow$ Secondary Wall $\rightarrow$ Plasma Membrane.

Answer 1

The Correct Option is C

Step 1: Analyze Assertion (A):
The middle lamella is the layer that holds or glues the different neighbouring cells together. It is indeed the first structure formed during cytokinesis (cell division) in plant cells.
Status: True.
Step 2: Analyze Reason (R):
The middle lamella develops from the cell plate, not the cell membrane. The cell plate is formed by the fusion of vesicles derived from the Golgi apparatus (and ER) at the center of the dividing cell (phragmoplast). It is composed chiefly of calcium pectate.
Status: False.
Step 3: Conclusion:
(A) is True, (R) is False.