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Biology some questions about the respiratory system from grade 9 unit 3, covering a range of topics: Choose the best answer 1. Which of the following is NOT a primary function of the respiratory system? A. Gas exchange B. Regulation of blood pH C. Production of red blood cells D. Protection from inhaled pathogens 2. What is the primary site of gas exchange in the lungs? A. Bronchi B. Bronchioles C. Alveoli D. Trachea 3. Which of the following structures is responsible for filtering air as it enters the respiratory system? A. Nose B. Larynx C. Trachea D. Alveoli 4. What is the name of the flap of cartilage that covers the trachea during swallowing? A. Epiglottis B. Diaphragm C. Larynx D. Bronchus 5. Which of the following is the correct order of structures through which air travels during inhalation? A. Nose, pharynx, larynx, trachea, bronchi, bronchioles, alveoli B. Alveoli, bronchioles, bronchi, trachea, larynx, pharynx, nose C. Trachea, bronchi, bronchioles, alveoli, pharynx, larynx, nose D. Larynx, trachea, bronchi, bronchioles, alveoli, pharynx, nose 6. Which of the following gases is transported in the blood primarily bound to hemoglobin? A. Oxygen B. Carbon dioxide C. Nitrogen D. Helium 7. What is the role of the diaphragm in breathing? A. To filter air B. To produce mucus C. To create pressure changes in the chest cavity D. To warm and humidify air 8. Which of the following is TRUE about the process of inspiration (inhalation)? A. The diaphragm contracts and moves upward. B. The pressure in the chest cavity increases. C. Air flows out of the lungs. D. The rib cage moves downward. 9. What is the name of the condition where the air sacs in the lungs become damaged and lose their elasticity? A. Asthma B. Emphysema C. Bronchitis D. Pneumonia 10. What is the primary function of the cilia that line the respiratory tract? A. To produce mucus B. To filter air C. To trap and remove foreign particles D. To warm and humidify air 11. Which of the following is NOT a symptom of a respiratory infection? A. Coughing B. Sneezing C. Fever D. Diarrhea 12. What is the name of the gas that is a byproduct of cellular respiration and is transported to the lungs for exhalation? A. Oxygen B. Nitrogen C. Carbon dioxide D. Helium 13. Which of the following is a common respiratory disorder that causes inflammation and narrowing of the airways, leading to wheezing and difficulty breathing? A. Asthma B. Emphysema C. Bronchitis D. Pneumonia 14. What is the name of the condition where a person's breathing stops for short periods during sleep? A. Sleep apnea B. Asthma C. Emphysema D. Bronchitis 15. Which of the following is TRUE about the role of the respiratory system in maintaining blood pH? A. The respiratory system helps remove carbon dioxide, which is acidic. B. The respiratory system helps add carbon dioxide to the blood, which is acidic. C. The respiratory system has no role in regulating blood pH. D. The respiratory system regulates blood pH by controlling the amount of oxygen in the blood. 16. Which of the following structures is located in the throat and is responsible for voice production? A. Larynx B. Pharynx C. Trachea D. Bronchi 17. Which of the following is a common cause of respiratory infections? A. Bacteria B. Viruses C. Fungi D. All of the above 18. What is the name of the gas that makes up the largest percentage of air that we breathe? A. Oxygen B. Carbon dioxide C. Nitrogen D. Helium 19. Which of the following is a measure of lung function that assesses how much air a person can exhale in one forced breath? A. Tidal volume B. Forced expiratory volume (FEV) C. Vital capacity D. Total lung capacity 20. Which of the following is a device used to measure lung function? A. Stethoscope B. Spirometer C. Electrocardiogram D. Otoscope The answer answers will be released soon. Write your answer under the comment! 🙏            Set by Maths group11

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Biology some questions from grade 9 unit 3 about the digestive system: Choose the best answer! 1. Which of the following is NOT a primary function of the digestive system? A. Nutrient absorption B. Waste removal C. Hormone production D. Immune function 2. Where does the process of digestion begin? A. Stomach B. Small intestine C. Mouth D. Large intestine 3. What is the primary function of saliva? A. To break down proteins B. To absorb nutrients C. To lubricate food and begin carbohydrate digestion D. To neutralize stomach acid 4. Which of the following enzymes breaks down proteins in the stomach? A. Amylase B. Lipase C. Pepsin D. Lactase 5. What is the role of the stomach's churning action? A. To absorb nutrients B. To produce bile C. To break down food into smaller pieces D. To regulate blood sugar levels 6. What is the name of the muscular contractions that move food through the digestive tract? A. Peristalsis B. Segmentation C. Digestion D. Absorption 7. Which part of the digestive system is responsible for the majority of nutrient absorption? A. Stomach B. Small intestine C. Large intestine D. Esophagus 8. What is the function of bile? A. To break down carbohydrates B. To neutralize stomach acid C. To emulsify fats D. To produce enzymes 9. Where is bile produced? A. Pancreas B. Liver C. Gallbladder D. Stomach 10. What is the main function of the large intestine? A. Nutrient absorption B. Water absorption and waste formation C. Protein digestion D. Production of bile 11. Which of the following is NOT a digestive enzyme? A. Pepsin B. Amylase C. Lipase D. Insulin 12. What is the name of the valve that controls the flow of food from the stomach into the small intestine? A. Pyloric sphincter B. Esophageal sphincter C. Anal sphincter D. Ileocecal valve 13. Which type of food molecule is broken down by lipase? A. Carbohydrates B. Proteins C. Fats D. Nucleic acids 14. What is the name of the tiny finger-like projections in the small intestine that increase surface area for absorption? A. Villi B. Microvilli C. Crypts D. Peyer's patches 15. What is the function of the villi? A. To produce digestive enzymes B. To absorb nutrients C. To regulate blood sugar levels D. To store bile 16. Which of the following is NOT a benefit of the gut microbiota (bacteria in the large intestine)? A. Production of some vitamins B. Breakdown of undigested material C. Strengthening the immune system D. Production of insulin 17. What is the name of the condition where the stomach contents flow back into the esophagus? A. Ulcer B. Heartburn C. Constipation D. Diarrhea 18. Which of the following is a common symptom of indigestion? A. Nausea B. Constipation C. Diarrhea D. All of the above 19. What is the name of the process by which the body gets rid of waste products through the digestive system? A. Digestion B. Absorption C. Elimination D. Metabolism 20. Which of the following is a common digestive disorder? A. Irritable bowel syndrome (IBS) B. Crohn's disease C. Celiac disease D. All of the above Prepared by Maths group11.