Year 8 Semester 2 Practice Exam PDF

**Year 8 Semester 2 Practice Exam** **Name:** **Multiple Choice Questions:** 1. What is the smallest unit of an element that retains the properties of that element? 2. Which of the following terms refers to a substance that is made up of two atoms of the same element? 3. Which of the...

**Year 8 Semester 2 Practice Exam** **Name:** **Multiple Choice Questions:** 1. What is the smallest unit of an element that retains the properties of that element? 2. Which of the following terms refers to a substance that is made up of two atoms of the same element? 3. Which of the following elements is a noble gas? 4. The horizontal rows in the periodic table are called: 5. Which of the following is an example of a compound? 6. What is the process in which a solid turns directly into a gas without passing through the liquid state? 7. Which of the following is an example of a physical change? 8. Which of the following terms refers to the substances that undergo a change in a chemical reaction? 9. What do you call a substance that speeds up a chemical reaction without undergoing any change itself? 10. Which of the following is responsible for carrying oxygen in the blood? 11. Where does the process of digestion primarily take place in the human body? a) Stomach 12. What is the main function of the respiratory system? 13. Which of the following is a symptom of asthma? 14. Which component of blood is primarily responsible for fighting infections in the body? 15. What is the main function of chlorophyll in plants? 16. Which structure in the plant is responsible for transporting water and nutrients from the roots to the rest of the plant? 17. Which of the following is a disease of the circulatory system? 18. What is the process by which plants lose water through small openings on their leaves? 19. Which of the following is a function of the liver in the human body? 20. What is the main component of the cell wall in plant cells? **Short Answer Questions:** 1. Explain the difference between an element and a compound. 2. Describe the process of sublimation with an example. 3. Name three major types of chemical changes and provide an example of each. 4. Define peristalsis and explain its role in the digestive system. 5. List and describe the three main functions of the respiratory system. 6. What are the symptoms of emphysema, and how does it affect the respiratory system? 7. Describe the structure of the heart and explain its function in the circulatory system. 8. Explain the concept of osmosis in plant cells. 9. Discuss the role of stomata in photosynthesis and transpiration in plants. 10. What are the major differences between arteries and veins in the circulatory system? 11. Describe the function of xylem and phloem in plants. 12. Explain the relationship between the structure of a leaf and its role in photosynthesis. **Extended Response Questions:** 1. Compare and contrast the processes of physical and chemical digestion in the human digestive system. 2. Explain the relationship between the structure and function of the alveoli in the respiratory system. 3. Discuss the causes and symptoms of coronary heart disease and explain how it affects the circulatory system. 4. Compare and contrast the processes of photosynthesis and cellular respiration in plants and explain their importance in the plant kingdom.