Explanation

• A thermal conductor is a material that allows heat to pass through it easily.
• Metals like copper, aluminum, and iron are good thermal conductors.
• Thermal conduction occurs mainly in solids where particles are closely packed.
• In contrast, thermal insulators (like wood, plastic, and rubber) resist heat flow.

Last verified on 13-03-2026

Explanation

• Green plants use carbon dioxide (CO₂) from the atmosphere to make food via photosynthesis.
• In photosynthesis, CO₂ + H₂O → Glucose + O₂ (with sunlight and chlorophyll).

Last verified on 13-03-2026

Explanation

• The same atomic number (Z) → same number of protons
• Different mass numbers → different number of neutrons

Explanation

• The freezing point of water is 0°C (32°F), where water changes from liquid to solid.
• The melting point is also 0°C, where ice changes from solid to liquid.
• Freezing and melting are opposite processes occurring at the same temperature.

Last verified on 13-03-2026

Explanation

• Liquids have no fixed shape but have a fixed volume.
• Particles are close together but can slide past each other, allowing the liquid to flow.

Additional information:

• Solid: Are tightly packed and stay in a fixed position
• Gas: Are widely spaced and move freely in any direction

Last verified on 13-03-2026

Explanation

• Glucose is a simple sugar (monosaccharide) and a primary source of energy for cells.
• Its chemical formula is C6H12O6.

Additional information:

• Fructose: C6H12O6 (same formula as glucose, different structure)
• Galactose: C6H12O6
• Ribose: C5H10O5
• Deoxyribose: C5H10O4
• Sucrose (disaccharide): C12H22O11

Last verified on 13-03-2026

Explanation

• Mitochondria are known as the powerhouse of the cell.
• They are the site of cellular respiration, where glucose is converted into ATP (energy).
• Mitochondria have a double membrane and their own DNA and ribosomes.
• They provide energy for all cell activities.

Last verified on 13-03-2026

Explanation

• The diaphragm of a microscope controls the amount of light passing through the specimen.
• In humans, the iris regulates the amount of light entering the eye through the pupil.

Additional information:

• Eyepiece → Lens of eye (focuses image)
• Stage → Retina (holds specimen/image for observation)
• Light source → Pupil (allows light to enter)
• Objective lens → Cornea & Lens (magnifies object)

Last verified on 13-03-2026

Explanation

• Remote Sensing is the science of collecting information about the Earth’s surface without direct contact.
• It is mainly done using satellites equipped with special sensors and cameras in space.
• These satellites capture images and data used for mapping, weather forecasting, and environmental monitoring.

Last verified on 12-03-2026

Explanation

• Wind energy is a form of kinetic energy produced by the movement of air.
• This moving air rotates the blades of wind turbines or fans to generate electricity.
• Wind power is an important renewable and clean energy source.

Last verified on 12-03-2026