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What is the primary function of the digestive system in humans?

  • (A) Absorb oxygen
  • (B) Break down food
  • (C) Transport blood
  • (D) Produce hormones

Answer: Break down food

The digestive system is responsible for breaking down food into smaller components that the body can absorb and use for energy.

Which of the following is NOT an example of a renewable energy source?

  • (A) Solar energy
  • (B) Wind energy
  • (C) Coal
  • (D) Geothermal energy

Answer: Coal

Coal is a non-renewable resource, whereas solar, wind and geothermal energy are renewable because they naturally regenerate.

What is the main function of the large intestine?

  • (A) Absorb water
  • (B) Digest proteins
  • (C) Produce bile
  • (D) Absorb nutrients

Answer: Absorb water

The large intestine absorbs water and salts from the material that has not been digested, forming solid waste for elimination.

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What is the process of changing a gas into a liquid?

  • (A) Sublimation
  • (B) Evaporation
  • (C) Freezing
  • (D) Condensation

Answer: Condensation

Condensation is the process by which a gas turns into a liquid when it cools down.

What type of cell division occurs in somatic cells?

  • (A) Mitosis
  • (B) Meiosis
  • (C) Binary fission
  • (D) Budding

Answer: Mitosis

Mitosis is the process of cell division that produces two genetically identical daughter cells and occurs in somatic (body) cells.

What is the pH value of water?

  • (A) 7
  • (B) 0
  • (C) 14
  • (D) 5

Answer: 7

Pure water has a neutral pH of 7, meaning it is neither acidic nor basic.

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Which of the following is a property of gases?

  • (A) Definite shape
  • (B) Definite volume
  • (C) Compressible
  • (D) Solid

Answer: Compressible

Gases have no definite shape or volume and can be compressed easily due to the wide spacing between their molecules.

Which of the following is an example of an omnivore?

  • (A) Lion
  • (B) Eagle
  • (C) Human
  • (D) Elephant

Answer: Human

Humans are omnivores, meaning they consume both plant and animal products.

What is the energy stored in an object due to its position called?

  • (A) Potential energy
  • (B) Kinetic energy
  • (C) Thermal energy
  • (D) Chemical energy

Answer: Potential energy

Potential energy is stored energy that an object has due to its position or state, such as a rock held above the ground.

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What is the term for the change of a liquid to a gas?

  • (A) Condensation
  • (B) Sublimation
  • (C) Freezing
  • (D) Evaporation

Answer: Evaporation

Evaporation is the process where a liquid changes into a gas, typically when it absorbs heat.

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