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Question
What is the distinguishing feature between an insect and a crustacean?
What is the distinguishing feature between an insect and a crustacean?
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Solution
The correct option is A Number of appendages
- Insects and crustaceans belong to the same phylum—arthropods.
- Insects, such as ants, flies, wasps, and dragonflies, have tri-segmented bodies consisting of the head, thorax, and abdomen; crustaceans, such as crabs, lobsters, shrimps, and crayfish, have only two body segments — the head and thorax. These two segments fuse together into a cephalothorax and an abdomen. Insects have three pairs of legs attached to their thoracic region. Crustaceans have more than three pairs of legs — usually five pairs in most species; however, this is highly variable as many species have more pairs.
- Hence the distinguishing feature between an insect and a crustacean is the number of appendages.
- So, the correct answer is 'Number of appendages'.
- Insects and crustaceans belong to the same phylum—arthropods.
- Insects, such as ants, flies, wasps, and dragonflies, have tri-segmented bodies consisting of the head, thorax, and abdomen; crustaceans, such as crabs, lobsters, shrimps, and crayfish, have only two body segments — the head and thorax. These two segments fuse together into a cephalothorax and an abdomen. Insects have three pairs of legs attached to their thoracic region. Crustaceans have more than three pairs of legs — usually five pairs in most species; however, this is highly variable as many species have more pairs.
- Hence the distinguishing feature between an insect and a crustacean is the number of appendages.
- So, the correct answer is 'Number of appendages'.
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