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Question
The table shows dengue cases in a hospital over one year: Jan 10, Feb 12, Mar 15, Apr 18, May 22, Jun 40, Jul 65, Aug 65, Sep 65, Oct 30, Nov 30, Dec 20. Make a bar graph (cases on Y-axis, month on X-axis) and answer: (i) In which three months were dengue cases highest? (ii) In which month(s) were cases lowest? (iii) What natural or environmental factors during peak months might increase dengue cases? (iv) Suggest preventive steps before the peak season.
📚 Concept: Spread and Prevention of Communicable Diseases
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Answer
Dengue peaks in the monsoon months of July, August, and September.
Explanation
- (i) The cases were highest in July, August, and September, with 65 each.
- (ii) The cases were lowest in January, with 10 cases.
- (iii) Monsoon rain leaves still water where mosquitoes breed, so cases rise.
- (iv) Before the peak, clear still water, use nets and repellents, and spray for mosquitoes.
Rainwater and mosquito breeding drive the monsoon dengue peak.
