Question

Match the process in Column–I with its explanation in Column–II and select the correct option.
Column – I Column – II
(i) Symport a) shrinking of protoplasm in a plant cell when placed in hypertonic solution
(ii) Facilitated diffusion b) transport of two types of molecules in same direction across cell membrane
(iii) Antiport c) selective transport of molecules across the membrane through proteins
(iv) Plasmolysis d) transport of two types of molecules in opposite direction across cell membrane

• A. (i)–a, (ii)–d, (iii)–c, (iv)–b
• B. (i)–b, (ii)–c, (iii)–d, (iv)–a
• C. (i)–b, (ii)–a, (iii)–c, (iv)–d
• D. (i)–b, (ii)–c, (iii)–a, (iv)–d

Hint:

{Symport = same direction}, {Antiport = opposite direction}.

Answer 1

The Correct Option is B

Step 1: Understanding transport mechanisms.
Cells use different transport mechanisms to move substances across membranes depending on direction and requirement of carrier proteins.

Step 2: Correct matching.
Symport: Transport of two different molecules in the same direction across the membrane – (b).
Facilitated diffusion: Selective transport of molecules across the membrane through carrier or channel proteins – (c).
Antiport: Transport of two different molecules in opposite directions across the membrane – (d).
Plasmolysis: Shrinking of protoplasm in a plant cell when placed in a hypertonic solution – (a).

Step 3: Conclusion.
Thus, the correct matching corresponds to option (B).