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

Explanation

• Nuts and seeds are rich sources of Vitamin E.
• Vitamin E acts as a strong antioxidant in the body.
• It helps protect cells from damage and aging effects.
• Common sources include almonds, sunflower seeds, and walnuts.
• It supports skin health and immune system.

Last verified on 09-06-2026

Explanation

• The human body contains about 65% oxygen by mass.
• Oxygen is the most abundant element in the human body.
• It is mainly present in water (H₂O) and organic compounds.
• It is essential for respiration and energy production.

Additional information:

• Carbon: ~18%
• Hydrogen: ~10%
• Nitrogen: ~3%
• Other elements: ~4% (calcium, phosphorus, etc.)

Last verified 09-06-2026