The germ causing Hepatitis is transmitted through:

1. The bite of a mosquito
2. Contamination of food by a housefly
3. Personal contact with a patient
4. Contaminated water

Which of the following is an agent that acts as an intermediate carrier of a pathogen?

1. Genes
2. Water
3. Vector
4. None of these

Plasmodium is a :

1. Virus
2. Protozoan
3. Bacterium
4. Fungus

The fishes which selectively devour mosquito larvae are :

1. Carps
2. Sharks
3. Dogfish
4. Gambusia