NEETZoologyStructural Organisation in Animals
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A cockroach can survive for several days even after its head is severed. Reason (R): The brain of the cockroach is located in the thorax and controls all vital visceral functions. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A(A) is correct but (R) is not correct.
- B(A) is not correct but (R) is correct.
- CBoth (A) and (R) are correct and (R) is the correct explanation of (A).
- DBoth (A) and (R) are correct but (R) is not the correct explanation of (A).
Correct answer
A. (A) is correct but (R) is not correct.
Step-by-step solution
Assertion (A) is correct. If the head of a cockroach is cut off, it will still live for as long as one week. Reason (R) is incorrect. The brain of the cockroach is not located in the thorax; it is represented by the supra-oesophageal ganglion which is located in the head. The reason a headless cockroach survives is that the head holds only a small bit of a nervous system, while the rest is situated along the ventral part of its body. Therefore, (A) is correct but (R) is not correct. Answer: (A) is correct but (R) i