Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R).Assertion (A): All vertebrates are chordates but allchordates are not vertebrate.Reason (R): The members of subphylum vertebratapossess notochord, during the embryonic period, thenotochord is replaced by a cartilaginous or bonyvertebral column in adults.In the light of the above statements, choose thecorrect answer from the options given below:
Answer
Assertion and Reason Explanation
Assertion (A): “All vertebrates are chordates but all chordates are not vertebrates.”
✅ True – The phylum Chordata includes animals that possess a notochord at some stage in life. Vertebrates, a subphylum of chordates, replace the notochord with a vertebral column during development. Hence, all vertebrates are chordates, but some chordates like urochordates and cephalochordates are not vertebrates.
✅ True – The phylum Chordata includes animals that possess a notochord at some stage in life. Vertebrates, a subphylum of chordates, replace the notochord with a vertebral column during development. Hence, all vertebrates are chordates, but some chordates like urochordates and cephalochordates are not vertebrates.
Reason (R): “The members of subphylum Vertebrata possess notochord during the embryonic period,
the notochord is replaced by cartilaginous or bony vertebral column in adults.”
✅ True – This is a correct statement. All vertebrates initially develop a notochord, which is later replaced by a cartilaginous or bony vertebral column depending on the organism (e.g., sharks vs. humans).
✅ True – This is a correct statement. All vertebrates initially develop a notochord, which is later replaced by a cartilaginous or bony vertebral column depending on the organism (e.g., sharks vs. humans).
Conclusion:
Both Assertion and Reason are true, and the Reason correctly explains the Assertion.
✅ Correct Answer: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)
Both Assertion and Reason are true, and the Reason correctly explains the Assertion.
✅ Correct Answer: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)