Explanation

• Microscopes are used to magnify and observe tiny objects.
• Such as microorganisms, cells, and tiny structures.
• That are not visible to the naked eye.

Explanation

• Chloroplasts are organelles found in plant cells.
• Animal cells do not have chloroplasts.
• That's why chloroplast is a major difference between animal and plant cells.

Explanation

• The lungs are the organs responsible for exchanging oxygen and carbon dioxide through the process of respiration.
• They consist of air-carrying tubes (bronchi and bronchioles) and tiny sacs (alveoli) where gas exchange occurs.

Explanation

• The part of the eye that controls the amount of light entering is the Iris.
• It adjusts the size of the pupil according to light intensity.
• In bright light, it reduces light entry; in dim light, it allows more light in.
• This process protects the retina and helps clear vision.

Last verified on 17-05-2026

Explanation

Discoverer of Cell: Robert Hook

Robert Hook described the cell as: Basic unit of life

Explanation

• A Periscope is an optical instrument used to observe objects that are not in direct line of sight.
• Such as monitoring the surface of the water from a submarine.

Explanation

• Cellulose is the main component of the cell wall in plant cells, providing strength, rigidity, and shape to the cell.
• It is a complex carbohydrate made up of glucose molecules. 
• It is responsible for maintaining the cell's structure and supporting its growth.

Explanation

• The speed of sound in air at 0°C (32°F) is 332 meters per second.

The speed of sound in different materials:

• Air: 332 m/s
• Sea water: 1530 m/s
• Lead: 2160 m/s
• Gold: 3240 m/s
• Brick: 3650 m/s
• Copper: 4760 m/s
• Glass: 5100 m/s
• Aluminium: 6420 m/s

Explanation

Primary consumers are animals that eat producers (plants) and are the first level of consumers in a food chain. They are also known as herbivores. Examples of primary consumers include:

• Insects (bees, butterflies, ants)
• Small mammals (cows, goats, rabbits, mice, squirrels)
• Birds (finches, sparrows, robins)
• Fish (some species of fish that eat algae or aquatic plants)

Explanation