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Nine Class Exam

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1. What is the primary function of enzymes in biological reactions?

Provide energy

Act as catalysts

Store information

Transport molecules

2. Which type of electromagnetic radiation has the shortest wavelength?

Radio waves

X-rays

Infrared

Gamma rays

3. What is the process of cell division in which gametes are formed?

Mitosis

Meiosis

Cytokinesis

Binary fission

4. Which element is the most abundant in the Earth's crust?

Silicon

Aluminum

Iron

Oxygen

5. What is the chemical formula for sulfuric acid?

HCl

H2SO4

HNO3

H2CO3

6. Which organelle is known as the 'control center' of the cell?

Nucleus

Mitochondria

Ribosome

Golgi apparatus

7. What is the pH of pure water?

7

6

8

9

8. What is the speed of light in a vacuum?

3 × 10^8 m/s

2.5 × 10^8 m/s

1.5 × 10^8 m/s

4 × 10^8 m/s

9. Which planet in our solar system has the largest number of moons?

Earth

Jupiter

Saturn

Neptune

10. What is the process by which plants convert light energy into chemical energy?

Photosynthesis

Respiration

Fermentation

Transpiration

11. What is the formula for calculating force?

Force = Mass × Acceleration

Force = Mass / Acceleration

Force = Mass + Acceleration

Force = Mass - Acceleration

12. What type of organism is capable of producing its own food through photosynthesis?

Heterotroph

Autotroph

Decomposer

Parasite

13. Which part of the human brain regulates balance and coordination?

Cerebrum

Cerebellum

Medulla

Thalamus

14. What is the primary function of the respiratory system?

Circulation

Gas exchange

Digestion

Excretion

15. Which of these substances is a strong acid?

Vinegar

Citric acid

Hydrochloric acid

Acetic acid

16. What is the main source of energy for producers in an ecosystem?

Water

Soil nutrients

Sunlight

Oxygen

17. Which type of rock is formed by the cooling and solidification of lava?

Sedimentary

Igneous

Metamorphic

Fossil

18. What is the process by which water vapor cools and becomes liquid?

Evaporation

Condensation

Sublimation

Freezing

19.Which type of organism breaks down dead material in an ecosystem?

Producer

Consumer

Decomposer

Herbivore

20. Which is the strongest type of chemical bond?

Ionic

Covalent

Metallic

Hydrogen

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