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NEET2026BiologyChapterActual

Read the following statements regarding the phylum Cnidaria and select the CORRECT ones. (i) Digestion in cnidarians is exclusively intracellular. (ii) Corals are cnidarians that possess a skeleton composed of calcium carbonate. (iii) They have a central gastro-vascular cavity with a single opening, the mouth on the hypostome. (iv) Adamsia represents the umbrella-shaped and free-swimming medusa form. (v) Cnidoblasts

Options

  1. A(i), (ii) and (iv) only
  2. B(iii), (iv) and (v) only
  3. C(ii), (iii) and (v) only
  4. D(i), (iii) and (iv) only

Correct answer

C. (ii), (iii) and (v) only

Step-by-step solution

Statement (i) is incorrect because digestion in cnidarians is both extracellular and intracellular. Statement (ii) is correct as some cnidarians, like corals, have a skeleton composed of calcium carbonate. Statement (iii) is correct because cnidarians have a central gastro-vascular cavity with a single opening, the mouth on the hypostome. Statement (iv) is incorrect because Adamsia (sea anemone) represents the polyp form, which is sessile and cylindrical. The medusa form is umbrella-shaped and free-swimming, repres

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