NEET 2011 Biology question

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 gizzardCorrect

Answer: (4)

Solution

In the cockroach the mouth parts (mandibles) cut and grind the food, and the gizzard (proventriculus) with its chitinous teeth further grinds it. Malpighian tubules arise at the junction of the midgut and hindgut (not

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Question ID VK-090889