Consider statements about human nutrition: 1. Fats provide more energy per gram than carbohydrates. 2. Roughage prevents constipation. 3. Water is not considered a nutrient. Which are correct? MCQ with Answer and Explanation

Explanation:
Urobilin is derived from bilirubin, a heme breakdown product, and gives urine its yellow color. R is true and explains A.

Explanation:
Typhoid fever is a life-threatening systemic infection caused by the bacterium Salmonella typhi. It is transmitted through contaminated food and water. Symptoms include sustained high fever, headache, abdominal pain, and sometimes a rash. The Widal test is a common diagnostic test for typhoid. S. pneumoniae causes pneumonia, and V. cholerae causes cholera.

Explanation:
Chlorophyll a and b absorb red and blue light and reflect green, giving leaves their color. Carotenoids are yellow/orange, anthocyanins red/purple.