Correct Option
Detritivores are heterotrophic organisms that obtain nutrients by consuming detritus (decomposing plant and animal parts, as well as feces). This process is crucial for nutrient cycling in ecosystems, as they break down organic matter into simpler forms, making nutrients available for producers.
- Earthworms: These are primary detritivores that ingest soil organic matter, contributing to its breakdown, aeration, and nutrient release.
- Millipedes: They primarily feed on decaying plant material, playing a role in the fragmentation of detritus.
- Woodlice: Also known as pill bugs, they consume dead and decaying plant matter, aiding in its decomposition.
Therefore, Earthworms, Millipedes, and Woodlice are all classified as detritivores.
Incorrect Options
- Jellyfish: These are carnivorous aquatic animals, primarily preying on zooplankton, small fish, and other marine organisms. They are not detritivores.
- Seahorse: These are marine fish that feed on small crustaceans and other invertebrates by suction feeding. They are predators, not detritivores.
- Option 1 (1, 2 and 4 only): This option is incorrect because Jellyfish (2) and Seahorse (4) are not detritivores.
- Option 2 (2, 3,4 and 4 only): This option is structurally flawed with repeated '4' and is incorrect as Jellyfish (2) and Seahorse (4) are not detritivores.
- Option 4 (1, 2, 3, 4 and 5): This option is incorrect because it includes Jellyfish (2) and Seahorse (4), which are not detritivores.