IGCSE Biology Paper-3: Specimen Questions with Answers 328 - 330 of 358

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Passage

Cholera is an example of a transmissible disease.

Question 328 (3 of 7 Based on Passage)

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Define the term transmissible disease.

Explanation

A transmissible disease may be transmitted through direct contact (e. g. blood exchange with an infected host) or through a vector (e. g. contaminated surfaces, fomite, air, foods, animals, etc.) . Examples of transmissible disease are AIDS, herpes, etc.

Question 329 (4 of 7 Based on Passage)

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Table shows the number of reported cases of cholera in the world during 2014 and 2015.

The Number of Reported Cases of Cholera in the World During 2014 and 2015
year20142015
number of cases192000171000

(i) Calculate the percentage decrease in the number of cases of cholera between 2014 and 2015.

Show your working and give your answer to the nearest whole number.

… %

Explanation

So, 10 % decrease is there in cholera cases since 2014.

Question 330 (5 of 7 Based on Passage)

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Cholera is transmitted in contaminated water.

State two ways water can be treated to prevent the spread of cholera.

Explanation

The cholera bacterium is usually found in water or food sources that have been contaminated by feces (poop) from a person infected with cholera. Cholera is most likely to be found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene. The cholera bacterium may also live in the environment in brackish rivers and coastal waters.

Treatment of Waste Water

  • Drink and use safe water bottled water with unbroken seals and canned/bottled carbonated beverages are safe to drink and use.
  • Wash your hands often with soap and safe water before you eat or prepare food.
  • Use latrines or bury your fecal matter; do not defecate in any water body.

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