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Seven Class Exam

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1. Which organelle is responsible for photosynthesis in plant cells?

Nucleus

Mitochondria

Chloroplast

Ribosome

2. What is the main gas found in Earth's atmosphere?

Oxygen

Nitrogen

Carbon Dioxide

Argon

3. Which type of rock is formed from the accumulation of sediment?

Igneous

Metamorphic

Sedimentary

Basalt

4. What is the function of ribosomes in a cell?

Energy production

Protein synthesis

DNA replication

Lipid storage

5. What is the primary component of natural gas?

Ethane

Methane

Propane

Butane

6. What is the chemical formula for water?

H2O

CO2

O2

NaCl

7. What kind of bond is formed when electrons are transferred between atoms?

Covalent

Ionic

Metallic

Hydrogen

8. Which part of the human brain is responsible for voluntary actions?

Cerebrum

Cerebellum

Brainstem

Thalamus

9. Which of these is a conductor of electricity?

Rubber

Glass

Copper

Plastic

10. What is the main function of white blood cells?

Carry oxygen

Fight infections

Clot blood

Produce hormones

11. What is the main component of the sun?

Helium

Hydrogen

Oxygen

Carbon

12. What kind of change is rusting of iron?

Physical

Chemical

Biological

Nuclear

13. Which layer of Earth is liquid?

Crust

Mantle

Outer Core

Inner Core

14. What is the primary pigment found in plants that captures light energy?

Carotene

Chlorophyll

Anthocyanin

Xanthophyll

15. Which is the largest planet in the solar system?

Earth

Venus

Jupiter

Saturn

16. Which part of a plant is responsible for reproduction?

Roots

Stem

Leaves

Flowers

17. What is the primary cause of tides on Earth?

Wind

Moon’s gravity

Earth’s rotation

Sun’s heat

18. Which organ in the human body is primarily responsible for detoxification?

Heart

Liver

Lungs

Kidneys

19.What type of energy is stored in food?

Kinetic

Chemical

Thermal

Nuclear

20. What is the primary pigment found in plants that captures light energy?

Carotene

Chlorophyll

Anthocyanin

Xanthophyll

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