Which of the following is a water-borne disease? MCQ with Answer and Explanation

Explanation:
Lignin is a complex organic polymer deposited in the secondary cell wall of xylem vessels and sclerenchyma fibers, providing rigidity, strength, and water resistance. It is the major non-carbohydrate component of wood. Cellulose is the main polysaccharide in the primary wall, chitin is in fungi and arthropods, pectin is in the middle lamella and primary wall.

Explanation:
Heredity (inheritance) is the transmission of genetic information and traits from parents to offspring through genes. Variation refers to differences among individuals, evolution is the change in heritable traits over generations, and mutation is a change in DNA sequence. Mendel's laws describe the patterns of heredity. Genes are the units of heredity.

Explanation:
Vitamin B12 (cyanocobalamin) is a complex vitamin that contains the trace mineral cobalt. Vitamin K is essential for the synthesis of prothrombin and other clotting factors in the liver. Beriberi is caused by a deficiency of Vitamin B1 (thiamine), whereas Vitamin C deficiency causes scurvy. Thus, statements 1 and 2 are correct.