Important Questions for Class 7 Curiosity Chapter 9 Life Processes in Animals

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:

1. Mouth
2. Oesophagus (Food pipe)
3. Stomach
4. Small intestine
5. Large intestine
6. Rectum
7. Anus

5 Marks

Question 1:
Describe the journey of food through the human digestive system.
Answer
The journey of food begins in the mouth, where the teeth chew the food and saliva starts digesting starch. The food then passes through the oesophagus into the stomach, where it is mixed with digestive juices and partially digested. Next, it enters the small intestine, where digestive juices from the liver and pancreas complete digestion. Nutrients are absorbed into the bloodstream through the walls of the small intestine. The undigested food moves into the large intestine, where water is absorbed. Finally, the waste is stored in the rectum and removed from the body through the anus.

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