Consider statements about human excretion: 1. The kidneys regulate blood pressure. 2. Ammonia is the primary nitrogenous waste in humans. 3. The nephron filters blood in the glomerulus. Which are correct? MCQ with Answer and Explanation

Explanation:
Cholera is an acute diarrheal illness caused by the bacterium Vibrio cholerae, typically transmitted through contaminated water. Polio (poliomyelitis) is a highly infectious viral disease caused by the poliovirus, which can lead to paralysis. Malaria is a life-threatening disease caused by Plasmodium parasites, which are transmitted to humans through the bites of infected female Anopheles mosquitoes. All three statements are correct.

Explanation:
Vitamin A is chemically known as retinol. It is essential for vision, immune function, and epithelial maintenance. Vitamin B₁ is thiamine, C is ascorbic acid, D is calciferol. Deficiency of vitamin A causes night blindness and xerophthalmia.

Explanation:
Magnesium (Mg²⁺) is a crucial cofactor for ATP-utilizing enzymes, including DNA polymerase, and is essential for nucleic acid structure, nerve impulse transmission, and muscle contraction. Iron is for hemoglobin, zinc for many enzymes and transcription factors, calcium for bones and signaling. Magnesium is the central atom in chlorophyll.