Cloaca is

A

Absent in mammals

B

Found in prototheria

C

Present in all fishes

D

Both B and C.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Definition of Cloaca**: - The cloaca is a common chamber and outlet into which the intestinal, urinary, and reproductive tracts open. It is a multifunctional structure found in certain animal groups. 2. **Presence in Different Animal Groups**: - **Mammals**: Cloaca is not present in all mammals. It is absent in most placental mammals and marsupials. - **Prototheria (Monotremes)**: Cloaca is present in all prototherians, which include monotremes like the platypus and echidna. - **Fishes**: Cloaca is present in some fish, specifically in certain groups like elasmobranchs (sharks and rays), but not in all fish species. 3. **Conclusion**: - The cloaca is found in all prototherians (monotremes) and in some fish (specifically elasmobranchs), but it is absent in most mammals. Therefore, the statement that cloaca is found in all prototherians is correct. **Final Answer**: Cloaca is present in all prototherians (monotremes) and in some fish, but is absent in most mammals. ---
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