Q. Which of the following is correctly stated as it happens in the common cockroach?
A) The food is ground by mandibles and gizzard
B) Malpighian tubules are excretory organs projecting out from the colon
C) Oxygen is transported by haemoglobin of blood
D) Nitrogenous excretory product is urea
Explanation
[Solution from source] In the cockroach, food is first chewed by the mandibles and then ground further in the gizzard, which has chitinous teeth. Malpighian tubules arise at the junction of the midgut and hindgut, the blood has no haemoglobin, and the excretory product is uric acid. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.