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Question
The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:
- Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
- Identify the infective stage labelled ‘D’.
- Name the structure labelled ‘A’ and ‘E’.
- Give any one symptom of malaria.
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Solution
- The asexual phase of the life cycle takes place in human beings, while the sexual phase occurs in the female Anopheles mosquito.
- The gametocyte is the infectious stage that contains the uninucleate, lancet-shaped sporozoite (approximately 1 x 7 µm). Sporozoites are produced during sexual reproduction in the midgut of Anopheles mosquitos and migrate to the salivary glands.
- The structure labelled 'A' represents the liver, while the structure labelled 'E' corresponds to red blood cells (RBC).
- A symptom of malaria is experiencing shaking chills.
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