Ciliates differ from all other protozoans in
Answer: (D) having two types of nuclei. Answer: (D) having two types of nuclei Solution: Ciliates (e.g., Paramoecium) are distinguished by having two types of nuclei — a large macronucleus and a small micronucleus — a feature absent in other protozoan groups.
- A.using pseudopodia for capturing prey
- B.having a contractile vacuole for removing excess water
- C.using flagella for locomotion
- D.having two types of nuclei✓
Correct Answer
(D) having two types of nuclei
Solution & Explanation
Answer: (D) having two types of nuclei Solution: Ciliates (e.g., Paramoecium) are distinguished by having two types of nuclei — a large macronucleus and a small micronucleus — a feature absent in other protozoan groups. Pseudopodia belong to amoeboid protozoans, flagella to flagellated protozoans, and a contractile vacuole is not unique to ciliates, so those distractors do not set ciliates apart. (The dimorphic-nuclei detail is extension beyond the NCERT prose, which describes ciliate cilia and gullet.) NCERT Reference: NCERT Class XI, Biological Classification, p.16, lines 8-12 — "Ciliated protozoans: These are aquatic, actively moving organisms because of the presence of thousands of cilia"