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NEET 2021 · BiologyPrevious Year Question

Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules

Answer: (D) Tight junctions and Gap junctions, respectively. Answer: (4) Tight junctions and Gap junctions, respectively.

  1. A.Adhering junctions and Tight junctions, respectively
  2. B.Adhering junctions and Gap junctions, respectively
  3. C.Gap junctions and Adhering junctions, respectively
  4. D.Tight junctions and Gap junctions, respectively✓

Correct Answer

(D) Tight junctions and Gap junctions, respectively

Solution & Explanation

Answer: (4) Tight junctions and Gap junctions, respectively. Solution: Tight junctions seal adjacent cells together and stop substances from leaking across a tissue, while gap junctions connect the cytoplasm of neighbouring cells and facilitate communication via the rapid transfer of ions and small molecules. Adhering junctions only cement cells together (mechanical anchoring) and perform neither of these two functions, so (4) is the correct pairing. NCERT (Class XI, Structural Organisation in Animals — Animal Tissues, pre-2023 rationalisation text): epithelial tissue — cell junctions (tight, adhering, gap).

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