UPSC CDS Science Biology Questions Part 1

Tuberculosis disease in humans can spread through air. Dengue fever is a mosquito-borne disease spread by the Aedes Aegypti and Aedes Albopictus species of mosquito. HIV can only be transmitted from an infected person to another through direct contact of bodily fluids, such as blood (including menstrual blood); semen/cum/precum/ejaculate; vaginal secretions; and breast milk. Goitre is enlargement of the thyroid gland, resulting in a prominentswelling in the front of the neck.