Match List-I (Porifera Class) with List-II (Characteristic Features) 1. Calcarea - iii. Calcium carbonate spicules

Question

Match List-I (Porifera Class) with List-II (Characteristic Features):

1. Calcarea - iii. Calcium carbonate spicules

2. Hexactinellida - i. Siliceous spicules, deep-sea forms

3. Demospongiae - ii. Spongin fibers, commercial sponges

4. Sclerospongiae - iv. Both siliceous spicules and spongin fibers

1. A. 1-iii, 2-i, 3-ii, 4-iv (Correct answer)
2. B. 1-ii, 2-iv, 3-iii, 4-i
3. C. 1-iv, 2-ii, 3-i, 4-iii
4. D. 1-i, 2-iii, 3-iv, 4-ii

Correct Answer

Option A — 1-iii, 2-i, 3-ii, 4-iv

Detailed Solution & Explanation

The correct answer is 1-iii, 2-i, 3-ii, 4-iv.

Key Points

• Calcarea = CaCO3 spicules; Hexactinellida = siliceous/deep-sea (glass sponges); Demospongiae = spongin fibers (bath sponges); Sclerospongiae = both spicule types.