Question

Assertion (A): Cases of malaria usually rise during and just after the rainy season. Reason (R): Malaria is caused by a protozoan called Plasmodium.

Typhoid spreads mainly through the bite of mosquitoes.

What is the difference between a vector and a carrier of disease? Give one example of each.

After the monsoon, many families in a housing colony fell ill with dengue, though the colony's tap water was clean. Residents found water collected in old tyres, flower-pot trays and air coolers. Explain why dengue spread, and suggest three steps residents and the municipality should take.