Y9 S2 Exam Revision (Annotated) PDF

**Cell Respiration and Photosynthesis** 1\. What are the main reactants and products in cellular respiration? 2\. Write the word equation for photosynthesis. 3\. Describe how energy is released in cellular respiration. **Ecosystems and Food Chains** 4\. What is an ecosystem? 5\. Explain the ro...

**Cell Respiration and Photosynthesis** 1\. What are the main reactants and products in cellular respiration? 2\. Write the word equation for photosynthesis. 3\. Describe how energy is released in cellular respiration. **Ecosystems and Food Chains** 4\. What is an ecosystem? 5\. Explain the role of producers in an ecosystem. 6\. Define a "keystone species" and provide an example. 7\. Describe what happens in a food chain when the population of a top predator decreases. 8\. Explain how energy is transferred through trophic levels in a food chain. 9\. What is an abiotic factor? Give an example. 10\. Describe how a disruption in the carbon cycle can impact ecosystems. 11\. Explain mutualism with an example. 12\. Explain parasitism with an example. 13\. Provide an example of competition in an ecosystem. **Environmental Science** 14\. Name two gases responsible for climate change. 15\. How do invasive pest species typically affect ecosystems? 16\. What are some consequences of adding too much carbon dioxide to the atmosphere? **Chemical Reactions and Neutralization** 17\. What are the reactants involved in a neutralization reaction? 18\. Balance the following equation: \_\_H₂ + \_\_O₂ → \_\_H₂O. 19\. Describe the difference between exothermic and endothermic reactions. 20\. How does the pH change when an acid is added to water? What about when a base is added? **Immunity and Vaccines** 21\. Describe the difference between active and passive immunity. 22\. Explain how vaccines work to prevent diseases. **Origin of the Universe and Energy** 23\. What is the current theory about the origin of the universe? 24\. Explain the process that releases energy from the sun. 25\. Describe redshift in the context of the Doppler effect. **Light and Electromagnetic Radiation** 26\. Write the speed of light equation. 27\. What is electromagnetic radiation? List some common examples and their uses. 28\. Solve a simple speed of light problem: If light travels at 300,000 km/s, how far will it travel in 2 seconds?