In a model, food spends 120 min in the crop, 20 min in the gizzard, 90 min in the midgut and 150…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a model, food spends in the crop, in the gizzard, in the midgut and in the hindgut.
- What is the total time in the gut, in minutes?
- What is the total time in hours? Give the answer to two decimal places.
- What per cent of the time is spent in the midgut? Give the answer to one decimal place.
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.
Given. , , and . The values are made up for the exercise.
Plan. Add the times. Change to hours. Take the share.
Step 1. Total. .
Step 2. Hours. .
Step 3. The midgut. .
Answer: ; ; .
Check. The four shares must add to : , with rounding.
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