Explanation

• The Soviet Union launched the first artificial satellite
• Satellite: Sputnik 1 (meaning "fellow traveller").
• Date: October 4, 1957.
• First US Satellite: Explorer 1 (January 31, 1958)
• A major milestone in space exploration and a key event in the Cold War.

Last updated by NA on 25-April-2026

Explanation

• Bacteria and fungi are examples of decomposers.
• Which are organisms that break down dead organic matter into simpler compounds, releasing nutrients back into the ecosystem.
• This process is essential for nutrient cycling and the health of ecosystems.

Explanation

The cochlea is a part of the human ear, not the eye.

Explanation

• Plants store the glucose produced during photosynthesis in the form of starch.
• A complex carbohydrate made up of many glucose molecules.
• Starch is stored in the plants roots, stems, leaves, and seeds, and serves as a energy reserve for the plant.

Explanation

The correct sequence represents the increasing levels of organization in living organisms:

• Organelle (components within a cell)
• Cell (the basic structural and functional unit)
• Tissue (a group of similar cells performing a specific function)
• Organ (a structure composed of two or more types of tissue that work together to perform specific functions)

Explanation

• Oxygen (O2) is the gas used to extract energy from food during cellular respiration.
• It releasing carbon dioxide and water as byproducts.

Explanation

• Sugar (a solid) dissolves in water (a liquid) to form a solution, making it a classic example of a solid-liquid solution.
• The sugar molecules (solute) are dissolved in the water molecules (solvent), resulting in a homogeneous mixture.

Explanation

The fog in winter is caused by a combination of:

• Suspended water droplets (condensation)
• Dust particles in the air
• Smoke (from human activities or natural sources)

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

• GPS stands for Global Positioning System, a network of satellites orbiting the Earth.
• It provide location information and timing signals to GPS receivers on the ground.