Say whether each statement is true or false, and correct each false one…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether each statement is true or false, and correct each false one.
- Ringworm is caused by a roundworm that lives under the skin.
- The eggs of Ascaris leave the body in the faeces of an infected person.
- The filarial worms live in the blood capillaries of the lower limbs.
- Entamoeba histolytica is a protozoan that lives in the large intestine.
- Houseflies spread amoebiasis because the parasite grows inside the fly.
Need a reminder? The key ideaShow
Amoebiasis is caused by a protozoan, ascariasis by a roundworm, filariasis by a filarial worm and ringworm by fungi. Prevention is by personal hygiene, public hygiene, control of vectors and vaccination. A population grows by a fixed factor each week, and cleaning removes a share of the sites.
The worked solution
Have you tried it?
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.
Step 1. (a) False. Fungi of the genera Microsporum, Trichophyton and Epidermophyton cause ringworm.
Step 2. (b) True.
Step 3. (c) False. The filarial worms live in the lymphatic vessels.
Step 4. (d) True.
Step 5. (e) False. The flies are mechanical carriers. They carry the parasite on their bodies from faeces to food.
Answer: (a) false; (b) true; (c) false; (d) true; (e) false.
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