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Q.

Given below are two statements: One is labeled as Assertion (A) and the other is labeled as Reason (R):

Assertion (A) : The body cavity that is present in roundworms is called pseudocoelom.

Reason (R) : The body cavity in these animals is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the exoderm and endoderm.

In the light of above statements, choose the most appropriate answer from the options given below.

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a

(A) is correct but (R) is not correct.

b

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

c

Both (A) and (R) are correct and (R) is the correct explanation of (A).

d

(A) is not correct but (R) is correct.

answer is A.

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Detailed Solution

Both (A) and (R) are correct and (R) is the correct explanation of (A).

Roundworms belong to the group of animals known as pseudocoelomates. The pseudocoelom is derived from the blastocoel (the cavity of the blastula) and is not completely lined by mesoderm. Instead, the mesoderm is present in scattered pouches within the pseudocoelom.

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Given below are two statements: One is labeled as Assertion (A) and the other is labeled as Reason (R):Assertion (A) : The body cavity that is present in roundworms is called pseudocoelom.Reason (R) : The body cavity in these animals is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the exoderm and endoderm.In the light of above statements, choose the most appropriate answer from the options given below.