Question
Download Solution PDFThe body of which of the following phyla is triploblastic, segmented and bilaterally symmetrical?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Arthropoda.Key Points
- Arthropoda
- The body of Arthropoda is triploblastic, segmented and bilaterally symmetrical.
- Invertebrate creatures known as arthropods have a segmented body, an exoskeleton, and paired jointed legs.
- Arthropods have an external skeleton and are bilaterally symmetrical. They must go through many stages of moulting, a process through which they lose their exoskeleton to reveal a new one, in order to continue growing.
- More than one million species of known invertebrate animals make up the four subphyla of Arthropoda: Uniramia (which includes five classes of insects), Chelicerata (which includes three classes of arachnids and horseshoe crabs), Crustacea (which includes crustaceans), and Trilobita (trilobites).
Additional Information
- Before arthropods, all animals only inhabited the ocean.
- They have exoskeletons, which means that they are covered in skeletons.
- They must moult (or lose) their skeleton in order to grow a new one as they get bigger.
- The most prevalent and well-known arthropods are crayfish, scorpions, shrimp, lobster, insects, mites, and ticks.
- Some species are so tiny that they depend on other arthropods to survive.
Last updated on May 28, 2025
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