10.1. Infectious diseases
A subsection of Biology, 9700, through 10. Infectious diseases
Listing 10 of 208 questions
Diseases can be infectious or non-infectious. Explain the difference between an infectious and a non-infectious disease. Malaria is an infectious disease caused by Plasmodium. Plasmodium requires two hosts to complete its complex life cycle. One of the hosts is the Anopheles mosquito, which acts as a vector of malaria. Transmission of malaria occurs when females of some species of Anopheles take blood meals from humans infected with Plasmodium, and then feed on uninfected individuals. Both male and female Anopheles mosquitos have piercing and sucking mouthparts. The female mosquito is shown in . The blood meals are a good source of protein for Anopheles for the production of eggs. Explain why blood is a good source of protein. shows the global distribution of those species of Anopheles that are able to act as hosts for Plasmodium. Key no Anopheles A. gambiae complex other Anopheles species Describe and explain the difference between the global distribution of Anopheles shown in and the global distribution of malaria. The distribution of Anopheles shown in includes over forty different species that are vectors of malaria. The areas with the highest number of cases of malaria are also the areas where Anopheles gambiae occurs. A. gambiae is responsible for most of the transmission of the disease in these areas. Suggest why A. gambiae is responsible for most of the transmission of Plasmodium. is part of a complex food web in an area of Kenya where the larvae and adults of A. gambiae occur. eastern green mamba yellow winged bat dragonfly guppy large egret mosquitofish freshwater shrimp larvae adult sweet potato plant A.gambiae phytoplankton (photosynthetic microscopic organisms) Name one organism in that is a tertiary consumer. Explain, in terms of energy transfer, why it is likely that the eastern green mamba feeds on other organisms in addition to yellow winged bats. Suggest how the information in can be used in the control of malaria in other areas of Kenya. Both male and female adult A. gambiae feed on sweet potato plants. shows a sweet potato plant. Suggest the parts of the sweet potato plants that are the main source of food for adult A. gambiae and explain your answer.
9700_w15_qp_22
THEORY
2015
Paper 2, Variant 2
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208