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Metamorphosis describes the process of a larva transforming into an adult. Animals undergoing metamorphosis exhibit indirect development. Examples include the change of a maggot into a fly, a caterpillar into a butterfly, and a tadpole into a frog. However, earthworms develop directly, meaning they lack a larval stage and do not undergo metamorphosis.

1. Pharyngeal gill slits are found in both hemichordates and chordates, while the notochord is exclusive to chordates. A ventral tubular nerve cord is characteristic of non-chordates.
2. Arthropods have a rigid exoskeleton made mainly of chitin, segmented bodies, and jointed appendages. Their appendages can be uniramous (unbranched) or biramous (branched), while parapodia are paired lateral extensions on body segments.
3. Prawn, Scorpion, and Locusta are members of the phylum Arthropoda, the largest phylum in Animalia, encompassing over two-thirds of all named species. The name Arthropoda refers to the jointed appendages (arthros = jointed, poda = appendages) found in these animals.
4. Silverfish is a representative of the phylum Arthropoda, the largest phylum in Animalia, which includes two-thirds of all identified species.

Correct answer: Prawn, Scorpion, and Locusta are members of the phylum Arthropoda, the largest phylum in Animalia, encompassing over two-thirds of all named species. The name Arthropoda refers to the jointed appendages (arthros = jointed, poda = appendages) found in these animals.

Solution

The correct choice is the one that correctly identifies Prawn, Scorpion, and Locusta as arthropods and explains that Arthropoda means “jointed appendages.” The other options mix in unrelated traits or examples that do not fit the same phylum statement.

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