Grade 9 Science AssessmentInstructions: Answer each question carefully. Write your answer in the space provided.Please enable JavaScript in your browser to complete this form.Please enable JavaScript in your browser to complete this form.Name *FirstLast an and scientists Grade *Contact Number *Phone number or WhatsApp number1. What is the difference between a physical change and a chemical change?2. What is the formula for calculating speed?3. Define the term "ecosystem.4. What is the role of mitochondria in a cell?5. Name the three laws of thermodynamics.6. What is the significance of the atomic number in an element?7. Explain what a covalent bond is and give an example.8. What is the main function of the chloroplast in plant cells?9. Describe the process of cellular respiration.10. What is an acid-base reaction? Give an example.11. What are the four main types of macromolecules found in living organisms?12. Define homeostasis and provide an example in humans.13. What is Newton's third law of motion?14. Name one renewable energy source and one non-renewable energy source.15. What is the difference between genotype and phenotype?16. Explain what a food chain is and provide an example.17. What are enzymes, and how do they function in biological reactions?18. Describe the structure of DNA and its role in heredity.19. What is biodiversity, and why is it important for ecosystems?20. Explain how natural selection leads to evolution.21. What are tectonic plates, and how do they relate to earthquakes?22. Define kinetic energy and give an example of it in motion.23. What is the scientific method, and what are its steps?24. Name one effect of climate change on global ecosystems.25. What is an ion, and how does it differ from a neutral atom?26. Describe the water cycle and its importance to life on Earth.27. What role do producers play in an ecosystem?28. Explain what a hypothesis is in scientific research.29. What are greenhouse gases, and how do they contribute to global warming?30. Describe one method scientists use to date ancient fossils or rocks.Assess My Answers
