PPSC MCQs

Immunity uses physical barriers, cells, and molecules to defend the body.
It includes innate and adaptive responses.

Vaccines expose the immune system to safe antigenic material.
This creates memory for faster future protection.

Antibiotics act on features such as bacterial walls or ribosomes.
Viruses use host-cell machinery and lack those targets.

Resistance evolves through mutations and selection.
Misuse and overuse of antibiotics accelerate its spread.

Plasmodium parasites cause malaria.
They are transmitted mainly by infected female Anopheles mosquitoes.

Tuberculosis is a bacterial disease, often affecting the lungs.
It spreads through airborne droplets.

Cholera is caused by Vibrio cholerae.
Safe water, sanitation, and rapid rehydration are essential.

Carbohydrates are broken down mainly into glucose.
Cells use glucose to produce ATP.

Dengue is transmitted mainly by Aedes aegypti and related mosquitoes.
These mosquitoes often bite during daytime.

Proteins supply amino acids for building and repairing tissues.
They also form enzymes, antibodies, and many hormones.

Cool running water removes heat and limits tissue damage.
Direct ice can worsen injury by causing cold damage.

Fat provides about nine kilocalories per gram.
Carbohydrates and proteins provide about four each.