The number of malarial patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for this?
Answer:
The food chain in the given situation will be:
Phytoplankton —> Zooplankton —> Mosquito larva —> Frogs
In the absence of frogs (as they were exported), more mosquito larvae survived giving rise to large number of mosquitoes. The large number of mosquitoes caused increased incidences of malaria.