Which of the following happens is true about the common cockroach?
Correct answer: D. Their food is ground by mandibles and the gizzard
- A. Malpighian tubules are its excretory organs projecting out from the colon
- B. Oxygen is transported by haemoglobin in their blood
- C. Its nitrogenous excretory product is urea
- D. Their food is ground by mandibles and the gizzard
Explanation
The mouth part of the cockroach contains two mandibles. When both the mandibles work simultaneously in the horizontal plane, the food matter is cut and masticated into fine and smaller pieces. The gizzard is a part of the alimentary canal. It bears six muscular folds which are covered by chitinous conical plates, the teeth, used for grinding the food.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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