Explanation

• Vitamins are micronutrients required by the body in small amounts.
• They help in growth, immunity, metabolism, and overall health.

Additional information:

Micronutrients: Vitamins and minerals

Macronutrients: Carbohydrates, proteins, and fats

• Vitamin A → Vision
• Vitamin C → Immunity and wound healing
• Vitamin D → Healthy bones
• Vitamin K → Blood clotting

Last verified on 11-06-2026

Explanation

• InIntrinsic factor is secreted by parietal cells of the stomach lining.
• It is essential for the absorption of Vitamin B12 in the small intestine.
• Without intrinsic factor, Vitamin B12 deficiency can occur.
• This may lead to pernicious anemia.
• It is produced in the gastric glands of the stomach.

Last verified on 10-06-2026

Explanation

• The part of the eye that controls the amount of light entering is the Iris.
• It adjusts the size of the pupil according to light intensity.
• In bright light, it reduces light entry; in dim light, it allows more light in.
• This process protects the retina and helps clear vision.

Last verified on 17-05-2026

Explanation

• White blood cells (WBCs) are responsible for the body’s immunity and defense system.
• They protect the body from bacteria, viruses, and infections.
• They identify and destroy harmful pathogens.
• They are also called leukocytes.

Last verified 10-06-2026

Explanation

• Ornithology is the branch of zoology that deals with the study of birds.
• It includes bird behavior, classification, and migration patterns.
• Scientists who study birds are called ornithologists.

Last verified on 10-06-2026