Explanation

• DNA (Deoxyribonucleic acid) is made up of a double helix of two complementary strands.
• The double helix structure of DNA was discovered by James Watson and Francis Crick in 1953.

Explanation

Explanation

• Phenolphthalein is a pH indicator that changes color in response to changes in acidity or basicity.
• In an acidic medium, it is colorless, and in a basic medium, it turns pink.

Explanation

Explanation

Explanation

• The ozone layer is a layer of gas in the stratosphere that contains a high concentration of ozone (O3).
• It absorbs most of the sun's ultraviolet (UV) radiation, protecting the Earth from harmful UV rays.

Explanation

Electronics is the branch of science that studies the flow and control of electrons, especially in circuits.

It uses active devices (like transistors and diodes) to control electron flow through amplification and rectification.

Explanation

• The renal artery is a blood vessel that carries oxygenated blood from the heart to the kidneys.
• It supplying them with the necessary blood flow to filter waste and excess substances from the body.

Explanation

Hydraulic power systems use fluids to transmit power and motion, and the most common fluids used are:

• Water (in hydraulic systems like water supply networks, fire suppression systems, and hydroelectric power plants)
• Oil (in hydraulic systems like heavy machinery, construction equipment, and industrial manufacturing)
• Non-compressible fluids (like hydraulic fluids, brake fluids, and transmission fluids) that are specifically designed for hydraulic systems.

Explanation