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This has mouth on lower side and anus on...

This has mouth on lower side and anus on upper side

A

Limulus

B

Buthus

C

Daphnia

D

Sea Urchin.

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "This has mouth on lower side and anus on upper side," we need to analyze the options provided: Limulus, Butis, Daphnia, and Caeochin. ### Step-by-Step Solution: 1. **Understanding the Question**: The question specifies an organism that has its mouth located on the lower side (ventral surface) and its anus on the upper side (aboral surface). 2. **Evaluating the Options**: - **Limulus**: This organism, commonly known as the horseshoe crab, has a terminal mouth and its anus is also located on the lower side. Thus, it does not fit the criteria. - **Butis**: This refers to a scorpion, which also has its mouth at the anterior end and the anus at the posterior end. Therefore, it does not meet the requirement. - **Daphnia**: Known as the water flea, Daphnia has a terminal mouth and mandibles for chewing, with its anus also positioned on the lower side. This option is incorrect as well. - **Caeochin**: This term refers to the sea urchin. In sea urchins, the mouth is located on the lower side (ventral surface), and the anus is located on the upper side (aboral surface). This matches the description given in the question. 3. **Conclusion**: Based on the analysis of the options, the correct answer is **Caeochin (Sea Urchin)**, as it is the only organism that has its mouth on the lower side and anus on the upper side. ### Final Answer: The correct option is **Caeochin (Sea Urchin)**.
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