Water-related Diseases
Overview
Some of the deadliest diseases in human history travel by water. A child can fall ill from a single mouthful of contaminated water; a village can be devastated by mosquitoes breeding in a nearby pond. Yet these same diseases are among the most preventable on Earth. Clean water, a proper toilet, a bed net and a vaccine can stop an epidemic before it starts.
In this lesson you will learn how two very different water-related diseases spread: cholera, carried in water fouled by human waste, and malaria, carried by a mosquito that breeds in water. You will study the strategies that control each one, from handwashing and chlorination to bed nets and insecticides, and learn to weigh up which works best in a given situation, exactly as the exam asks.
Objectives
- 3.3.1 Describe how mosquitoes spread malaria, limited to: (a) female Anopheles mosquitoes as the vector (b) malaria Plasmodium parasite transmitted to humans when bitten by an infected mosquito (c) the malaria parasite is transmitted to non-infected mosquitoes when they feed on the blood of infected humans.
- 3.3.2 Describe strategies to control malaria, limited to: (a) personal protection: nets, insect repellent, vaccination and antimalarial drugs (b) vector control: cover or drain breeding areas, spraying large areas with insecticides, sterilise male mosquitoes and biological control.
- 3.3.3 Describe strategies to control cholera, limited to: (a) handwashing (b) adequate sanitation and sewage treatment (c) potable water supply: boiling and chlorination (d) vaccination.
- 3.3.4 Discuss the benefits and limitations of strategies to control water-related diseases.
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Water-related Diseases. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The organism that causes cholera is: A. Plasmodium B. Anopheles C. Vibrio cholerae D. a mosquito Answer: C
- Malaria is spread to humans by: A. drinking contaminated water B. the bite of a female Anopheles mosquito C. eating infected food D. contact with faeces Answer: B
- Cholera is described as a water-borne disease because it is: A. carried by an insect that breeds in water B. caught by drinking water containing the bacteria C. only found near the sea D. caused by salty water Answer: B
- Which of these is a method of vector control for malaria? A. taking antimalarial drugs B. using a bed net C. draining still water where mosquitoes breed D. boiling drinking water Answer: C
- Chlorinating drinking water helps to control cholera because it: A. removes the salt B. kills the bacteria in the water C. drains mosquito breeding sites D. provides a vaccine Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
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