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

1. Malpighian tubules are excretory organs projecting out from the colon
2. Oxygen is transported by haemoglobin in blood
3. Nitrogenous excretory product is urea
4. The food is ground by mandibles and gizzard

Correct answer: The food is ground by mandibles and gizzard

Solution

In cockroach, mandibles chew the food and the gizzard (proventriculus) further grinds it. The other options are incorrect because Malpighian tubules open into the gut, oxygen is not carried by haemoglobin, and the main nitrogenous waste is uric acid.

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