It is not true for Phylum Platyhelminthes:
Correct answer: D. Radially symmetrical body
- A. Bilaterally symmetrical
- B. Triploblastic metazoan
- C. Dorsoventrally compressed body
- D. Radially symmetrical body
Explanation
The correct answer is 'Radially symmetrical body'. Phylum Platyhelminthes is characterized by bilateral symmetry, meaning there is only one plane of symmetry that divides the body into left and right halves. In contrast, radial symmetry, which is incorrect for this phylum, involves multiple planes of symmetry that pass through a central axis, as seen in organisms like cnidarians. Additionally, Platyhelminthes are triploblastic metazoans with a dorsoventrally compressed body, which further distinguishes them from radially symmetrical organisms.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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