Explanation

In the normal human eye, the image is formed On the retina, where light is focused and converted into electrical signals by photoreceptors.

This allows us to perceive and interpret visual information.

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

• When an object reflects all the component colors of light, it appears white.
• This is because the object is reflecting all the wavelengths of visible light, which are then perceived by our eyes as white.
• If an object absorbs all seven colors of light (i.e., all the wavelengths of visible light), it appears black.

Explanation

There are 26 bones in the human foot and 27 bones in the human hand.

The foot has:

• 7 tarsal bones
• 5 metatarsal bones
• 14 phalanges (toe bones)

The hand has:

• 8 carpal bones
• 5 metacarpal bones
• 14 phalanges (finger bones)

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

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Explanation

• Comets: huge masses of snow and rocks that revolve around the Sun in orbits.
• Comets: have huge glowing tails.
• Halley's Comet was last seen in: 1986
• Halley's Comet will be next seen in: 2062

Explanation

• In maize (Zea mays), the first structure to emerge from the seed during germination is the radical root.
• It is also known as the primary root.
• This root grows downward into the soil, anchoring the seedling and absorbing water and nutrients.

Explanation

• Golden Rice, a type of genetically modified rice, has been engineered to produce beta-carotene, a precursor to vitamin A.
• This aims to address vitamin A deficiency, which is prevalent in many developing countries.
• It can cause health problems like night blindness and weakened immunity.

Explanation

• Sound travels fastest in diamond, with a speed of approximately 12,000 meters per second (m/s).
• This is because diamond has a very high stiffness and density, which allows sound waves to propagate quickly through the material.

The speeds of sound in different materials:

• Air: 343 m/s
• Water: 1433 m/s
• Wood: 3300-3600 m/s
• Brick: 4176 m/s
• Steel: 6100 m/s
• Diamond: 12000 m/s

Explanation

• Easily digested and absorbed
• Quickly converted into glucose
• Readily available for use by the body's cells