Explanation

• Myopia (Nearsightedness) is an eye defect in which near objects are clear but distant objects appear blurred.
• It occurs when the image forms in front of the retina instead of on it.
• It is corrected by using a concave (diverging) lens.
• The concave lens helps to shift the image back onto the retina.

Last verified on 01-04-2026

Explanation

• Red blood cells lack a nucleus to maximize space for hemoglobin, which carries oxygen.
• More hemoglobin means more oxygen transport.
• This makes RBCs highly efficient for gas exchange.
• Lack of nucleus also gives them a flexible shape.
• This helps them pass through narrow blood capillaries.

Last verified on 14-06-2026

Explanation

• A tendon is not a bone; it is a strong connective tissue that connects muscles to bones.
• Tibia is the main bone of the lower leg.
• Femur is the thigh bone and the longest bone in the human body.
• Humerus is the bone of the upper arm.

Last verified on 06-09-2026

Explanation

• The spinal cord is not part of the brain; it is part of the central nervous system (CNS).
• The brain is broadly divided into forebrain, midbrain, and hindbrain.
• Pons and medulla oblongata are parts of the brainstem.
• The hindbrain includes the pons, medulla oblongata, and cerebellum.

Last verified on 06-09-2026

Explanation

• Blood is red because of a protein called hemoglobin inside our red blood cells,
• Which contains iron that changes color when it binds to oxygen

Last updated by NS on 5-09-2026

Explanation

• The mitochondrion is the primary site of oxidative phosphorylation in eukaryotic cells.
• Oxidative phosphorylation occurs mainly across the inner mitochondrial membrane.
• It produces most of the cell’s ATP (energy) through the electron transport chain and ATP synthase.

Last verified on 05-09-2026

Explanation

• The lungs exchange gases — they absorb oxygen (O₂) and release carbon dioxide (CO₂).
• This process is essential for respiration and energy production in the body.

Last verified on 05-09-2026

Explanation

• The pituitary gland is located at the base of the brain.
• It is below the hypothalamus.
• It sits in a hollowed-out area of the sphenoid bone called the sella turcica.

Last verified on 05-09-2026

Explanation

• Antonie van Leeuwenhoek is known as the Father of Microbiology.
• He was the first to observe and describe microorganisms using a microscope.
• He observed microscopic organisms in 1674.
• His discoveries included bacteria, protozoa, and other microscopic life forms.

Last verified on 05-09-2026

Explanation