Which one of the following pairs about organ/part that helps in locomotion is NOT correctly matched?
Nereis : Pseudopodia
Identifying Incorrect Locomotion Match: Nereis
The question asks us to identify the incorrect match between an organism and the part it uses for locomotion. Locomotion is simply the act of moving from one place to another. Let's analyze the provided pairs to find the mismatch.
Organism Locomotion Mechanisms
We will look at each option to understand how the organism moves:
- Euglena and Flagellum: Euglena is a microscopic, single-celled organism. It moves using a long, whip-like appendage called a flagellum. The flagellum rotates or undulates, pushing the Euglena through its aquatic environment. This is a correct association.
- Paramecium and Cilia: Paramecium is another single-celled organism, often found in freshwater. Its entire body is covered in tiny, hair-like structures called cilia. These cilia beat in a coordinated manner, allowing the Paramecium to swim smoothly. This is a correct association.
- Nereis and Pseudopodia: Nereis is a type of marine worm, specifically a polychaete annelid. These worms typically move using their segmented bodies and specialized paired appendages on each segment called parapodia. Parapodia help in both locomotion and respiration. Pseudopodia, on the other hand, are temporary extensions of the cytoplasm used for movement and feeding, mainly seen in amoebas. Since Nereis does not use pseudopodia for movement, this is an incorrect association.
- Starfish and Tubefeet: Starfish, also known as sea stars, belong to the group Echinodermata. They possess a unique system called the water vascular system, which controls numerous small, flexible, hydraulic tube-like structures called tubefeet. By extending and retracting these tubefeet, starfish can move along surfaces like the seabed. This is a correct association.
Conclusion on Mismatched Pair
After reviewing the locomotion methods for each organism, the pair Nereis : Pseudopodia is incorrectly matched. Nereis uses parapodia for movement, not pseudopodia.
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