Here are the answers to the biology questions: 1. The process of breaking down food into simpler substances is called Digestion. 2. The first organ of the digestive system is the Mouth. 3. Digestion of carbohydrates begins in the Mouth. 4. The enzyme present in saliva is Salivary amylase. 5. The tube connecting mouth to stomach is called Esophagus. 6. The wave-like movement pushing food forward is called Peristalsis. 7. Food is temporarily stored in the Stomach. 8. The acid present in the stomach is Hydrochloric acid / HCl. 9. The enzyme that digests proteins in the stomach is Pepsin. 10. The largest gland in the human body is the Liver. 11. The liver produces a digestive juice called Bile. 12. Bile is stored in the Gallbladder. 13. The gland that produces digestive enzymes and hormones is Pancreas. 14. Most digestion takes place in the Small intestine. 15. The longest part of the alimentary canal is the Small intestine. 16. Finger-like projections in the small intestine are called Villi. 17. The main function of villi is Absorption of nutrients. 18. Water is mainly absorbed in the Large intestine. 19. Undigested food is converted into Feces. 20. The opening through which feces leave the body is Anus. 21. Digestion of proteins begins in the Stomach. 22. Digestion of fats mainly occurs in the Small intestine. 23. The enzyme that breaks fats is Lipase. 24. The enzyme that breaks proteins is Protease. 25. The enzyme that breaks starch is Amylase. 26. The complete path of food through digestive organs is called the Alimentary canal. 27. Semidigested food in the stomach is called Chyme. 28. The muscular bag-like organ of digestion is the Stomach. 29. Absorption of digested nutrients occurs mainly in the Small intestine. 30. The digestive system converts food into Nutrients and energy.