Match the following cell structure with its characteristic feature: List I (a) Tight junctions (b) Adhering junctions (c) Gap junctions (d) Synaptic junctions List II (i) Cement neighbouring cells together to form a sheet (ii) Transmit information through chemicals to another cell (iii) Establish a barrier to prevent leakage of fluid across epithelial cells (iv) Cytoplasmic channels to facilitate communication between adjacent cells Select the correct option from the following:
Answer: (C) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii). Answer: (C) [option (3)] (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii).
- A.(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
- B.(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
- C.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)✓
- D.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
Correct Answer
(C) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
Solution & Explanation
Answer: (C) [option (3)] (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii). Solution: TIGHT junctions help to stop substances from leaking across an epithelium; they form a barrier that prevents leakage of fluid across epithelial cells — so (a) → (iii). ADHERING junctions perform cementing to keep neighbouring cells together, forming a continuous sheet — so (b) → (i). GAP junctions facilitate communication between adjacent cells by connecting their cytoplasm through cytoplasmic channels for the rapid transfer of ions and small molecules — so (c) → (iv). SYNAPTIC junctions (between neurons, or neuron and effector) transmit information by passing chemical signals (neurotransmitters) from one cell to another — so (d) → (ii). Note: the printed paper had garbled line-wrapping (List II item (ii) appeared spliced into the (b)/(d) rows); the intended matching is reconstructed above and is consistent with the keyed answer (3).