All the animals of grade radiata are which of the following?
Correct answer: D. Diploblastic
- A. Unicellular
- B. Triploblastic
- C. Both Options A and B are correct
- D. Diploblastic
Explanation
d) Diploblastic, The correct answer is "d) Diploblastic." Animals of the grade Radiata are diploblastic, which means they have two primary germ layers during embryonic development: the ectoderm and the endoderm. These two layers give rise to various tissues and structures in the adult organism. The Radiata grade includes phyla such as Cnidaria (e.g., jellyfish, corals) and Ctenophora (comb jellies), which are characterized by their diploblastic body organization.
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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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