Consider statements about human nutrition: 1. Carbohydrates are the primary energy source. 2. Proteins are made of fatty acids. 3. Vitamins are required in large quantities. Which are correct? MCQ with Answer and Explanation

Explanation:
Transitional epithelium (urothelium) is stratified, with cells that can change shape from cuboidal to squamous when the bladder distends. It lines the renal pelvis, ureters, bladder, and part of the urethra. Squamous is flat, cuboidal cube-shaped, columnar tall.

Explanation:
The medulla oblongata contains centers for heart rate, breathing, and blood pressure. Hypothalamus controls temperature and hunger, cerebrum intelligence and memory, cerebellum coordination.

Explanation:
Xylem is the vascular tissue responsible for the unidirectional upward transport of water and dissolved minerals from the roots to the aerial parts of the plant. Phloem is the vascular tissue responsible for the translocation of organic nutrients (primarily sucrose) from sources to sinks, which can be bidirectional. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth); primary growth (increase in length) is driven by apical meristems. Thus, statements 1 and 2 are correct.