Assertion: Archenteron is also known as the primordial gut.
Reason: Archenteron is a cavity which develops further into an alimentary canal.
If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark A
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark B
If Assertion is true statement but Reason is false, then mark C
If both Assertion and Reason are false statements, then mark D.
Archenteron is also known as the primordial gut because archenteron is a cavity which develops further into an alimentary canal and it form in gastrula stage.
Option 1 is the correct answer.