Which of the following is correctly stated as it happens in the common cockroach ?

Options

(a) Malpighian tubules are excretory organs projecting out from the colon
(b) Oxygen is transported by haemoglobin in blood
(c) Nitrogenous excretory product is urea
(d) The food is ground by mandibles and gizzard

Correct Answer:

The food is ground by mandibles and gizzard

Explanation:

Cockroach takes the food after grounding by its mandibles and gizzard