The region of the root where root hairs are formed is the: MCQ with Answer and Explanation

Explanation:
Kwashiorkor is a severe form of malnutrition caused by inadequate protein intake despite sufficient calorie consumption. Marasmus results from a severe deficiency of both calories and protein, leading to extreme wasting. Goiter is the enlargement of the thyroid gland caused by iodine deficiency, not iron deficiency (which causes anemia). Thus, statements 1 and 2 are correct.

Explanation:
Vitamin D (specifically cholecalciferol, Vitamin D3) is unique because it can be synthesized endogenously in the human skin. When 7-dehydrocholesterol in the skin is exposed to ultraviolet B (UVB) radiation from sunlight, it is converted to previtamin D3, which then isomerizes to Vitamin D3. It is subsequently hydroxylated in the liver and kidneys to its active hormonal form, calcitriol, which regulates calcium and phosphorus metabolism.

Explanation:
G.H.A. Hansen discovered Mycobacterium leprae in 1873, the first bacterium identified as causing a human disease. Koch later discovered TB.