A cockroach eats a crumb of bread. Write in order the parts of the foregut that the crumb passes…

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A cockroach eats a crumb of bread.

Write in order the parts of the foregut that the crumb passes.

Which part stores the food, and which part grinds it?

Where is the digestive juice added by the hepatic caeca?

Name the region where the Malpighian tubules open, and say what they do.

Need a reminder? The key ideaShow

The cockroach (Periplaneta americana) is an insect, in the phylum Arthropoda. Its body is covered by a hard chitinous exoskeleton made of plates called sclerites, and is divided into the head, the thorax and the abdomen. The head has two compound eyes, two antennae and chewing mouth parts. The thorax has three segments with three pairs of walking legs, and two pairs of wings: the leathery forewings (tegmina) and the membranous hind wings. The abdomen has ten segments and ends in a pair of anal cerci. The alimentary canal has a foregut (mouth, pharynx, oesophagus, crop and gizzard), a midgut and a hindgut (ileum, colon and rectum). The gizzard grinds the food with six chitinous plates.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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