Explanation

A convex lens has either one or both of its surfaces curving outwards, that is, wider divergence from the plan at the center.

These lenses are used to correct long-sightedness (hypermetropia).

Explanation

The stratospheric ozone layer is Earth's “sunscreen”  protecting living things from too much ultraviolet radiation from the sun.

Oxygen layer in the atmosphere

Ozone protects us from the harmful ultraviolet radiation of the sun.

Ozone formula: O3

The ozone layer lies approximately 15-40 kilometers (10-25 miles) above the Earth's surface, in the stratosphere.

The ozone layer is depleting: Air pollution

ND17-7-2023

Explanation

• Replication is the process by which a cell makes an exact copy of its DNA before cell division, ensuring that the new cell receives a complete set of genetic instructions.
• This process is crucial for the transmission of genetic information from one generation of cells to the next.

Explanation

• The kidneys are the primary organs responsible for removing waste and excess substances from the body through urine.
• They filter the blood and regulate electrolyte levels, playing a critical role in maintaining overall bodily function.

Explanation

• Red light has the longest wavelength, approximately 620-750 nanometers (nm).
• While violet light has the shortest wavelength, approximately 380-450 nm.
• The order of colours in the spectrum, from longest to shortest wavelength, is: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).

Explanation

• The stratosphere is the layer of the atmosphere where the ozone layer is present.
• It extends from approximately 12 to 50 kilometers (7.5 to 31 miles) above the Earth's surface.
• The ozone layer is a critical component of the Earth's atmosphere, as it absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.

Explanation

• A barcode reader, also called a price scanner or point-of-sale (POS) scanner.
• It is a hand-held or stationary input device.
• It used to capture and read information contained in a barcode.

Explanation

• The ozone layer in the stratosphere absorbs and restricts ultraviolet (UV) radiation from the sun.
• It protecting life on Earth from harmful UV rays.

Explanation

• The mole (mol) is the SI unit for the amount of substance.
• 1 mol = 6.022 × 10²³ elementary entities (Avogadro's number)
• One of the 7 base SI units (adopted 1971)
• Applies to atoms, molecules, ions, etc.
• Redefined in 2019 (based on fixed Avogadro constant)
• Links microscopic particles to grams via molar mass.

Explanation

A reaction in which heat is absorbed is called an endothermic reaction.

These reactions lower the temperature of their surrounding area, thereby creating a cooling effect.