Biology GK Questions Quiz-70

1381.What causes the mottling of the dental enamel? (1) High levels of chlorine in water (2) High levels of nitrate in the water (3) High levels of fluorides in the water (4) High levels of calcium in the water Answer: 1381.(3) The mottling of dental enamel is an extremely common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation. It is also known as dental fluorosis. Common causes of fluorosis include: fluoridated drinking water (particularly during infancy), ingestion of fluoride toothpaste, use of fluoride tablets, and consumption of processed foods made with fluoridated water. 1382.Blood is red in colour due to the presence of __________ . (1) Cytochrome (2) Chlorophyll (3) Hemocyanin (4) Haemoglobin Answer: 1382.(4) The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when vi…