Explanation

• HLA stands for Human Leukocyte Antigen.
• It is a system of proteins found on the surface of cells.
• It plays an important role in the immune system and body’s defense mechanism.
• HLA helps the body distinguish between self and foreign substances.

Last verified on 23-06-2026

Explanation

• The main purpose of pre-natal ultrasound is to monitor the growth and health of the fetus during pregnancy.
• It helps doctors check the baby’s position, heartbeat, and development.
• It can detect abnormalities or complications early.

Last verified on 23-06-2026

Explanation

• On average, the human body contains about 60–70% water.
• Adult males: 60–65%
• Adult females: 50–60%
• Infants: ~75%
• Main functions: transport, digestion, temperature regulation

Last verified on 23-06-2026

Explanation

• Hydrophytes have poorly developed roots.
• Because they live in water and can absorb water directly from their surroundings.

Additional information:

Key Characteristics of Hydrophytes:

• Reduced xylem tissue
• Large air spaces in tissues (aerenchyma)
• Thin or absent cuticle
• Flexible stems and leaves

Examples include water lily and Hydrilla.

Last verified on 23-06-2026

Explanation

• William Harvey discovered the circulation of blood.
• He was the first physician to completely describe systemic blood circulation.
• Famous book: De Motu Cordis (On the Motion of the Heart and Blood) (1628)
• He is known as the Father of Circulation of Blood.

Additional information:

• Birth: 1578
• Death: 1657

Last verified on 23-06-2026