Which one of the following pairs about organ/part that helps in locomotion is not correctly matched?
- A.Euglena : Flagellum
- B.Paramecium : Cilia
- C.Nereis : Pseudopodia
- D.Starfish : Tubefeet
Correct answer
Explanation
The correct answer is C, Nereis : Pseudopodia. Nereis, the sandworm, moves with parapodia, paired fleshy flaps on the sides of its body segments, not with pseudopodia.
Nereis is a marine annelid. Each segment carries a pair of parapodia bearing bristles called setae, which it uses to crawl and swim. Pseudopodia, or 'false feet', are temporary projections of cytoplasm used by Amoeba and some white blood cells to creep and to engulf food. Matching the right organ of movement to each organism is a common question: flagella and cilia are hair-like, beating structures, while tube feet are worked by the water vascular system.
Option A is wrong because Euglena really does swim with a whip-like flagellum. Option B is wrong because Paramecium is covered with thousands of beating cilia that move it along. Option D is wrong because a starfish, an echinoderm, moves with tube feet operated by its water vascular system.
Exam tip: Amoeba pseudopodia, Euglena flagellum, Paramecium cilia, Nereis parapodia, starfish tube feet.
Practice Questions
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- C.has high chemical stability
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- A.Cavity of tooth
- B.Erosion of nail
- C.Deformation of bone
- D.Mottling of tooth
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- A.1 and 3 only
- B.2 and 3 only
- C.1 and 2 only
- D.1, 2 and 3
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- C.Gibberellin
- D.Abscisic acid
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- A.Phosphorus
- B.Carbon
- C.Oxygen
- D.Nitrogen
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