Viruses reproduce only in the cells of host organism.

Rabies is a viral disease caused by rhabdovirus.  Plague is an infectious disease that is caused by the insect flea.

Common diseases like cold, influenza (flu) and cough are caused by virus.

 Minamata disease is caused due to mercury.

Female Anopheles mosquito transmits malaria.

Marasmus is caused by malnutrition. It is caused by the deficiency of proteins and energy-rich food.

It is called tetanus. When the skin is cut by a dirty or rusted object, germs may enter the body and cause a dangerous disease called tetanus.

Communicable diseases are caused by microorganisms. Microorganisms help in spreading a disease, thus making it communicable.

Conjunctivitis, also known as pink eye, is inflammation of the conjunctiva (the outermost layer of the eye and the inner surface of the eyelids).

It is in anaemia that the haemoglobin in the blood reduces. It is caused by the deficiency of iron. Hence, the oxygen carrying capacity of the blood reduces. It is in night blindness that the patient cannot see in dim light. In anaemia, the haemoglobin in the blood reduces.

Viruses are smaller than bacteria. Dengue fever is a mosquito-borne disease caused by the dengue virus.

Cholesterol is responsible for clogged arteries . Cholesterol is a special type of fat and its high intake can clog arteries.

Correct Answer: Tuberculosis usually spreads through milk.

It is caused by fungi.

It is caused by the deficiency of iodine.

Hepatitis is inflammation of the liver.

Metabolic malfunctioning is caused when chemical processes in the body do not function properly. Stones in kidneys or gall bladder are caused due to metabolic malfunctioning.

People suffering from thalassemia require blood transfusions as count of hemoglobin and healthy red blood cells decreases.

 It is a waterborne disease.