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1. Which of the following is a gas that plants use for photosynthesis?

• a) Oxygen

• b) Nitrogen

• c) Carbon Dioxide

• d) Hydrogen

2. What is the primary source of energy for the Earth?

• a) The Moon

• b) The Sun

• c) Wind

• d) Fossil Fuels

3. Which of the following is the smallest unit of life?

• a) Organ

• b) Cell

• c) Tissue

• d) Organism

4. What is the process by which a liquid turns into a gas?

• a) Freezing

• b) Condensation

• c) Evaporation

• d) Melting

5. Which of these elements is most commonly found in the human body?

• a) Carbon

• b) Nitrogen

• c) Hydrogen

• d) Oxygen

6. Explain the role of the heart in the circulatory system.

7. What is the difference between a producer and a consumer in an ecosystem?

8. Describe the water cycle in a few sentences.

9. What is the main function of the respiratory system in humans?

10.What is the significance of the scientific method in conducting experiments?

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