Identify the correct statement with reference to the diagram given below:
1
Water moves from A to B
2
Water moves from C to A
3
B has the highest water potential
4
C has the highest water potential
Official Solution
Correct Option: (3)
Step 1: Understanding Water Potential Water potential ( ) is the potential energy of water per unit volume relative to pure water, and it determines the direction of water movement. It is influenced by:
- Solute concentration: Higher solute concentration lowers water potential.
- Pressure potential: Physical pressure on water increases water potential. Step 2: Analyzing the Given Diagram - Cell A contains 10% solute concentration. - Cell B contains less solute than A, meaning higher water potential.
- Cell C contains 15% solute concentration, meaning lower water potential than both A and B. Since water moves from higher to lower water potential, and B has the lowest solute concentration, B has the highest water potential. Step 3: Identifying the Correct Answer - Option (1) Incorrect → Water moves from higher to lower potential, A does not have the highest potential.
- Option (2) Incorrect → Water does not move from C to A, as C has the lowest water potential. - Option (3) Correct → B has the highest water potential because it has the lowest solute concentration. - Option (4) Incorrect → C has the lowest water potential, not the highest.
02
PYQ 2025
medium
botanyID: ts-eamce
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.
1
Both (A) and (R) are true, (R) is the correct explanation of (A)
2
Both (A) and (R) are true, (R) is not the correct explanation of (A)
3
(A) is true, but (R) is false
4
(A) is false, but (R) is true
Official Solution
Correct Option: (3)
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.
