Life Processes in Animals
Short Questions
1. What is the role of saliva in digestion?
Answer: Saliva breaks down starch into sugar and moistens food for swallowing.
2. What is the longest part of the human digestive system?
Answer: The small intestine.
3. What does the large intestine absorb from undigested food?
Answer: Water and some salts.
4. What is the process of chewing food again in cows called?
Answer: Rumination.
5. What is the physical process of inhaling and exhaling air called?
Answer: Breathing.
6. Where does the exchange of oxygen and carbon dioxide happen in the lungs?
Answer: In the alveoli.
7. What helps protect the stomach lining from acid?
Answer: Mucus.
8.What do birds use to break down food instead of teeth?
Answer: Gizzard.
9.What gas turns lime water milky when exhaled?
Answer: Carbon dioxide.
10. What system transports nutrients and oxygen in the body?
Answer: Circulatory system.
Long Questions
1. How does food move through the food pipe to the stomach?
Answer: The food pipe’s walls contract and relax in a wave-like motion. This pushes the food down to the stomach.
2.Why does chewed rice taste sweet after some time?
Answer: Saliva breaks down starch in rice into sugar. This makes it taste sweet.
3.What happens to food in the small intestine?
Answer: Food is broken down into simpler forms by digestive juices. Nutrients are absorbed into the blood.
4.How does the respiratory system help us breathe?
Answer: Air enters through nostrils, passes through the windpipe, and reaches the lungs. Alveoli in the lungs exchange oxygen and carbon dioxide.
5. Why do some animals like frogs breathe differently?
Answer: Frogs use gills as tadpoles and lungs or skin as adults. This helps them breathe in water and on land.
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