This question was attempted by many candidates and their performance was good. In part (a) candidates correctly listed types of worms that infest humans with wrong spellings.
In part (b) candidates also stated effects of worm infestation in humans. In part (c) candidates correctly listed types of worms that infest humans but with wrong spellings.
In part (b) candidates also stated effects of worm infestation in humans. In part (c) candidates correctly enumerated ways by which worm infestation could be prevented in humans. In part (d) candidates also correctly described how water is purified for supply but some candidates were not able to describe the process of water purification sequentially.
The expected answers however are as follows:
1(a) TYPES OF WORMS
- thread worm
- roundworm
- guinea worm
- hook worm
- flatworm/tape worm
- filarial worm
(b) EFFECTS OF WORM INFESTATION IN HUMANS
- blood stain in faeces
- emaciation/weight loss/ poor growth/deprive humans of nutrients
- anaemia/paleness
- abdominal pains
- loss of appetite
- loss of sight
- bloated abdomen
- indigestion / constipation
- vomiting
- body itching /nervous disorders
- weakness
- cause diseases
- leads to death if not treated
(c) WAYS OF PREVENTING WORM INFESTATION IN HUMANS
- proper hygiene
- regular deworming
- good knowledge of Health Education
- proper cooking of foods
- elimination of primary and secondary hosts/vectors
- proper sewage disposal
- drink clean water
- avoid walking bare footed in infested areas/media
(d) DESCRIPTION OF WATER PURIFICATION FOR
A TOWNSHIP SUPPLY
- river water is pumped into tank of filter beds
- the filter beds removes the debris
- alum is added to quicken the rate of sedimentation
- resulting water is treated with carefully controlled quantity of chlorine
- to kill the harmful germs
- the treated water is pumped into a storage tank
- from where it is carried in pipes for supply to township
|
