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Assertion:Aschelminthes are called as ps...

Assertion:Aschelminthes are called as pseudo-coelomates.
Reason : In Aschelminthes, mesoderm is present as scattered pouches in between ectoderm and endoderm.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that Aschelminthes are called pseudocoelomates. - Pseudocoelomates are organisms that possess a body cavity (pseudocoel) that is not completely lined by mesoderm. 2. **Understanding the Reason**: - The reason provided states that in Aschelminthes, the mesoderm is present as scattered pouches between the ectoderm and endoderm. - This means that the body cavity is not fully surrounded by mesoderm, which aligns with the definition of pseudocoelomates. 3. **Classifying Body Cavities**: - Organisms can be classified based on their body cavities into three categories: - **Acoelomates**: No body cavity. - **Coelomates**: True body cavity lined by mesoderm. - **Pseudocoelomates**: Body cavity present but not lined by mesoderm. 4. **Evaluating the Assertion**: - Since Aschelminthes (which include roundworms and similar organisms) do have a body cavity that is not completely lined by mesoderm, the assertion is correct. 5. **Evaluating the Reason**: - The reason correctly describes the arrangement of mesoderm in Aschelminthes, confirming that it is indeed present as scattered pouches between the ectoderm and endoderm. 6. **Conclusion**: - Both the assertion and reason are true, and the reason accurately explains the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion. ### Final Answer: Both assertion and reason are true, and the reason is the correct explanation of the assertion.
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that Aschelminthes are called pseudocoelomates. - Pseudocoelomates are organisms that possess a body cavity (pseudocoel) that is not completely lined by mesoderm. 2. **Understanding the Reason**: - The reason provided states that in Aschelminthes, the mesoderm is present as scattered pouches between the ectoderm and endoderm. ...
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