Practice MCQ Questions and answers on Biology-GK

Etiology is the science of causes; especially of disease.

Active and passive humoral immunity are both mechanisms of adaptive immunity that use antibodies.

Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus. The virus spreads from person to person and can infect a person's spinal cord, causing paralysis.

Rhinitis is inflammation and swelling of the mucous membrane of the nose, characterized by a runny nose and stuffiness and usually caused by the common cold or a seasonal allergy. Colds and allergies are the most common causes of rhinitis.

Worldwide, iodine deficiency is the most common cause of thyroid enlargement and goiter. Within a goiter, nodules can develop. Patients with a large goiter may experience symptoms of choking, especially when lying down, and difficulty swallowing and breathing.

Tuberculosis, mumps and whooping cough are the contagious types of diseases. The diseases can spread through the droplets or the aerosols which are formed during coughing or sneezing. These aerosols contain the bacterium. The bacterium may enter the other person's body who is healthy and cause infection.

Anopheles mosquito carries Plasmodium which causes malaria in humans.

Diphtheria is readily preventable by vaccine administration. This is included in the triple vaccine: diphtheria, tetanus and pertussis vaccine (DTP) or the quintuple diphtheria, tetanus, pertussis, polio and Hib vaccine.

Abiotic factors are the non-living parts of the environment that can often have a major influence on living organisms. Abiotic factors include water, sunlight, oxygen, soil and temperature.