Important Questions for Class 7 Curiosity Chapter 9 Life Processes in Animals Marks 2 Question 1: What is mechanical digestion? Where does it take place? Answer: Mechanical digestion is the process of breaking food into smaller pieces by chewing. It takes place in the mouth , where the teeth cut, tear, and grind the food into fine pieces. Question 2: What is the role of saliva in digestion? Answer: Saliva moistens the food, making it easier to swallow. It also contains digestive juices that begin the digestion of starch present in the food. Question 3: Why do humans need to digest food? Answer: Humans need to digest food because the food we eat contains complex nutrients that cannot be absorbed directly. Digestion breaks them into simpler forms so that the body can absorb and use them for energy, growth, and repair. Question 4: Name the main parts of the human alimentary canal. Answer The main parts of the human alimentary canal are: Mouth Oesophagus (Food pipe) Stoma...