given below are two statements one is labelled as assertion a and the other is labelled as reason r assertion a four distinctive characteristics of phylum chordata are notochord single dorsal tubular nerve cord pharyngeal pouches and postanal

Question

given below are two statements one is labelled as assertion a and the other is labelled as reason r assertion a four distinctive characteristics of phylum chordata are notochord single dorsal tubular nerve cord pharyngeal pouches and postanal tail reason r the distinctive characteristics of phylum chordata remain unchanged throughout the life of these animals in the light of the above statements choose the most appropriate answer from the options given below 1 both a and r are correct and r is the correct explanation of a 2 both a and r are correct but r is not the correct explanation of a 3 ais correct but r is not correct 4 ais not correct but r is correct

Tiffany Greene · Answer

The question involves evaluating both the Assertion (A) and the Reason (R) and choosing the most appropriate answer from the options provided. Let's analyze them:

Assertion (A): Four distinctive characteristics of phylum Chordata are notochord; single, dorsal, tubular nerve cord; pharyngeal pouches and postanal tail.

Reason (R): The distinctive characteristics of phylum Chordata remain unchanged throughout the life of these animals.

Analyzing Assertion (A): This is a true statement. The four characteristics mentioned are indeed the distinctive features of phylum Chordata.
Analyzing Reason (R): This statement is incorrect. The distinctive characteristics mentioned might not always remain unchanged throughout the life of these animals. For example, in some chordates, the notochord is replaced by a vertebral column during development (such as in vertebrates).

Given this evaluation:

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

Therefore, the correct answer is:

Option 3: (A) is correct but (R) is not correct.

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