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What is the boiling point of nitrogen?

  • (A) -195.8?C
  • (B) -183.0?C
  • (C) -50?C
  • (D) 0?C

Answer: -195.8?C

The boiling point of nitrogen is -195.8?C, which is the temperature at which nitrogen transitions from liquid to gas.

Which of the following is a nonmetal?

  • (A) Iron
  • (B) Copper
  • (C) Oxygen
  • (D) Silver

Answer: Oxygen

Oxygen is a nonmetal, whereas iron, copper and silver are metals.

What is the main purpose of photosynthesis?

  • (A) To absorb sunlight
  • (B) To release oxygen
  • (C) To produce glucose
  • (D) To produce energy

Answer: To produce glucose

Photosynthesis is the process by which plants convert sunlight, carbon dioxide and water into glucose (a form of sugar) for energy.

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Which vitamin is produced when the skin is exposed to sunlight?

  • (A) Vitamin A
  • (B) Vitamin C
  • (C) Vitamin D
  • (D) Vitamin E

Answer: Vitamin D

Vitamin D is produced in the skin when it is exposed to sunlight, which helps the body absorb calcium for bone health.

What is the pH level of a neutral substance?

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

Answer: 7

A neutral substance has a pH of 7, indicating it is neither acidic nor basic (like pure water).

Which of the following is a function of the ribosomes?

  • (A) Protein synthesis
  • (B) Energy production
  • (C) Cell division
  • (D) Waste removal

Answer: Protein synthesis

Ribosomes are responsible for protein synthesis by translating mRNA into amino acid sequences, forming proteins.

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What is the name of the process by which plants release water vapor?

  • (A) Photosynthesis
  • (B) Transpiration
  • (C) Respiration
  • (D) Germination

Answer: Transpiration

Transpiration is the process through which plants release water vapor into the atmosphere through small pores on their leaves.

Which of the following is an example of a renewable resource?

  • (A) Coal
  • (B) Oil
  • (C) Solar energy
  • (D) Natural gas

Answer: Solar energy

Solar energy is a renewable resource because it is replenished naturally and is inexhaustible on a human time scale.

What is the process of cell division in prokaryotes called?

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

Answer: Binary fission

Binary fission is the process by which prokaryotic cells (like bacteria) replicate by splitting into two identical cells.

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What is the main function of the human digestive system?

  • (A) Produce hormones
  • (B) Break down food
  • (C) Regulate body temperature
  • (D) Filter waste

Answer: Break down food

The digestive system is responsible for breaking down food into nutrients the body can absorb and use for energy, growth and repair.

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