Question 2
The diagram below is an illustration of the external structure of a type of worm which infests humans. Study it and answer questions 2 (a), (i), (ii), (b) and (c).
- Name the:
- Mention three other worms that infest human. [3 marks]
- State two effects the worm illustrated has on humans. [2 marks]
- State two ways of controlling the worm illustrated [2 marks]
I Worm illustrated in the diagram [1 mark]
II Part labelled I, II, III and IV. [2 marks]
Observation
Many candidates attempted this question and their performance was good. In part (a) (i) majority of the candidates were able to name the worm illustrated in the diagram. In part (a) (ii) majority of the candidates could label correctly at least two parts In part (b) some candidates got it,. In part (c) some candidates could correctly state effects the worm illustrated has on humans. In part (d) most of the candidates did well in stating ways of controlling the worm illustrated.
The expected answers are as follow:
(a) (i) Worm illustrated in the diagram
- Tape worm / Taenia solium
(ii) Parts labelled
I - hook
II - sucker
III - neck
IV - proglottides
(b) Other worms that belong to the group of the worm named in a (i)
- guinea worm
- flatworm / named
- round worm/pin worm
- hook worm
- filarial worm
(c) Effects of the worm illustrated on humans
- irritation of the intestinal wall
- vomiting
- nervous disorders
- loss of appetite
- indigestion/stomach disorder
- anaemia
- drawing away nutritive food in the intestine
- susceptible to other diseases/poor resistance to disease
(d) Ways of controlling the worm illustrated
- meat/milk products should be well cooked
- use of drugs to kill the worms
- proper sanitation/proper disposal of faeces
- inspection of meat at abattoir/market by health inspectors