Explanation

• Decomposers are organisms that break down dead and waste products, releasing useful elements such as carbon, nitrogen, and phosphorus back into the soil and environment.
• This process is called decomposition, and it's an essential step in the nutrient cycle.

Decomposers include organisms like:

• Bacteria
• Fungi (such as mushrooms)
• Detritivores (such as earthworms and insects)

By breaking down organic matter, decomposers help to:

• Recycle nutrients
• Improve soil structure and fertility
• Support plant growth and development

Last verified on 07-03-2026

Explanation

• A parachute increases air resistance (drag) when it opens in the air.
• This slows down the falling speed of a skydiver, allowing a safe landing.

Forces acting on a skydiver:

• Gravity (pulls downward)
• Air resistance (pushes upward)

Last verified on 07-03-2026

Explanation

• An iron nail/steel rod can be magnetized by passing an electric current around it, a process known as electromagnetic induction.
• This is the principle behind electromagnets.

Last verified on 07-03-2026

Explanation

• Friction is a force that opposes motion between two surfaces in contact.
• It slows down or stops objects when they move against each other.
• Friction helps us walk, write, and hold objects without slipping.
• Too much friction can cause heat and wear in machines.

Last verified on 07-03-2026

Explanation

• Sublimation is the process in which a solid directly changes into a gas without passing through a liquid phase.
• This endothermic phase transition
• Occurs when a substance absorbs enough energy to overcome intermolecular forces.
• Deposition: Gas to Solid (the reverse process).
• Examples: Dry ice, iodine, frost/snow.

Explanation

• Apples contain about 0.3 grams of protein medium-sized fruit.
• Watermelon: 0.6 grams of protein per cup.
• Mango: 1.4 grams of protein per cup.
• Peanuts: 20.5 grams of protein per 100 grams.

Last verified on 06-03-2026

Explanation

• An aqueous solution is one where water acts as the solvent, dissolving the solute.
• This type of solution is common in many chemical reactions and biological processes.

Last verified on 06-03-2026

Explanation

• Sublimation is the process by which a solid substance transitions directly into a gas or vapour, without going through the liquid phase, and then condenses back into a solid.
• Examples include iodine, dry ice, and naphthalene.

Last verified on 06-03-2026

Explanation

• Gases do not have a definite shape or volume.
  • They take the shape and volume of the container they are in.
  • Gases can be compressed because the particles are far apart.

Last verified on 06-03-2026

Explanation

• Non-luminous objects do not produce their own light; they are visible because they reflect light from other sources.
• The Moon is non-luminous; it reflects sunlight.
• Luminous objects like the Sun, stars, and fireflies produce their own light.

Last verified on 06-03-2026