Biology MCQs with Answers

Explanation: Insulin is produced by the beta cells in the islets of Langerhans within the pancreas. Insulin regulates blood glucose levels.

Explanation: A normal human somatic (body) cell contains 46 chromosomes arranged in 23 pairs. Reproductive cells (eggs and sperm) contain 23 chromosomes each.

Explanation: Photosynthesis primarily produces glucose (C6H12O6) using CO2, water and sunlight. Oxygen is released as a by-product.

Explanation: O negative (O-) is the universal donor for red blood cells because it lacks A, B and Rh antigens, making it compatible with all blood types.

Explanation: A gene is the basic unit of heredity. Genes are segments of DNA that encode proteins and are passed from parents to offspring, determining traits.