NCERT Solutions Class 7 Science Curiosity Chapter 09 Life Processes in Animals

Class 7 Science Curiosity Chapter 9 Very Short Answer Type Questions

Question 1. What are life processes?
Answer: Life processes are the basic actions that living things must do to stay alive. These important tasks include getting food, breathing, moving blood, getting rid of waste, and having babies.
In simple words: These are the main things our bodies do to keep us alive.

Exam Tip: Remember to list at least three examples of these activities, such as breathing, eating, or digesting.

Question 2. What is the role of saliva in digestion?
Answer: Saliva makes our food wet so we can swallow it easily. It also starts changing the starch in food into sugar.
In simple words: Saliva wets our food and begins to break down starch.

Exam Tip: Always mention two functions: making food wet for swallowing, and breaking starch into sugar.

Question 3. Name the organ where absorption of digested food occurs.
Answer: The small intestine is where our body absorbs digested food.
In simple words: Our food gets absorbed in the small intestine.

Exam Tip: Write "Small intestine" clearly, as this is the main organ for absorbing nutrients.

Question 4. What is egestion?
Answer: Egestion is how our body gets rid of waste food that cannot be digested. This waste leaves through the anus.
In simple words: It means pushing out undigested food waste from the body.

Exam Tip: Do not confuse egestion with excretion. Egestion specifically means removing solid, undigested food waste.

Question 5. What is the function of alveoli in lungs?
Answer: Alveoli are tiny bags in our lungs. They let oxygen pass into our blood and take carbon dioxide out of it.
In simple words: They are small air sacs where gas is swapped between the air and our blood.

Exam Tip: Use terms like "gas exchange," "oxygen," and "carbon dioxide" when describing the work of the alveoli.

Class 7 Science Curiosity Chapter 9 Short Answer Type Questions

Question 6. What is rumination? Name animals that ruminate.
Answer: Rumination is when an animal brings back half-digested food from its stomach to chew it again. Animals like cows, goats, and buffaloes do this.
In simple words: It is when animals chew their food twice to digest it better.

Exam Tip: Give at least two common examples like cows and goats to score full marks.

Question 7. What happens to the food in the stomach during digestion?
Answer: In the stomach, food is squeezed and mixed with special juices, acid, and mucus. This process breaks down proteins and kills bad bacteria that might make us sick.
In simple words: The stomach mixes food with acid and juices to break down protein and kill germs.

Exam Tip: Be sure to mention both actions: breaking down proteins and killing harmful bacteria using acid.

Question 8. What does the liver secrete and what is its function?
Answer: The liver produces a juice called bile. This liquid helps make stomach acid less strong and breaks large fats into very small drops.
In simple words: The liver makes bile to help digest fats and balance stomach acid.

Exam Tip: Remember that bile's main job is to break down fats into smaller droplets so they are easier to digest.

Question 9. What is the difference between breathing and respiration?
Answer: Breathing is just moving air in and out of our lungs. Respiration is a chemical change inside our cells where oxygen is used to get energy from food.
In simple words: Breathing is taking air in and out, but respiration is making energy from food.

Exam Tip: Always highlight that breathing is physical, whereas respiration is a chemical process inside cells.

Question 10. What happens to undigested food in the large intestine?
Answer: The large intestine takes out water and minerals from the waste food. The leftover solid waste is kept in the rectum before it leaves the body through the anus.
In simple words: The large intestine sucks out water from waste and prepares it to leave the body.

Exam Tip: Mention the absorption of water and salts, followed by storage of waste in the rectum.

Class 7 Science Curiosity Chapter 9 Descriptive Answer Type Questions

Question 11. Explain the process of digestion in the mouth.
Answer: Digestion starts in our mouth when our teeth chew and crush the food. Saliva then begins to turn the food's starch into sugars. Finally, our tongue stirs the food with saliva and slides it down the food pipe.
In simple words: In the mouth, food is chewed, mixed with saliva, and pushed down the food pipe.

Exam Tip: Describe the roles of the teeth, saliva, and tongue clearly to show a complete understanding of how digestion begins.

Question 12. How is the small intestine adapted for absorption?
Answer: The inner walls of the small intestine have tiny, finger-like folds called villi. These folds create a huge space that makes absorbing food much faster. The absorbed nutrients then go into the blood to travel all over our body.
In simple words: Tiny finger-like parts called villi help the small intestine soak up food into the blood quickly.

Exam Tip: Use the keyword "villi" and explain how they increase the surface area for absorption.

Question 13. How does a bird digest food without teeth?
Answer: Instead of teeth, birds have a strong, muscular part called a gizzard. They swallow tiny stones, and the gizzard squeezes these stones against the food to grind it up before it goes to the intestine.
In simple words: Birds use a gizzard filled with little swallowed stones to grind their food.

Exam Tip: Mention that the gizzard uses swallowed stones and muscular walls to crush food in place of teeth.

Question 14. Describe the human respiratory system briefly.
Answer: When we breathe, air goes into our nose and travels down the windpipe to reach our lungs. Inside the lungs, the air goes into tiny air sacs. Here, fresh oxygen enters our blood, and waste carbon dioxide is pushed out when we breathe out.
In simple words: Air goes through our nose and windpipe into our lungs, where our blood takes oxygen and gives away carbon dioxide.

Exam Tip: List the organs in order: nostrils, nasal passage, windpipe (trachea), lungs, and alveoli.

Question 15. What is the role of the diaphragm in breathing?
Answer: The diaphragm is a sheet of muscle that goes down when we breathe in. This creates more room in our chest so air can rush into our lungs. When we breathe out, it moves up to squeeze the air back out.
In simple words: The diaphragm moves down to let air in and moves up to push air out.

Exam Tip: Clearly describe what happens to the chest space and the air during both breathing in and breathing out.

Class 7 Science Curiosity Chapter 9 Exploring Questions

Question 16. Why do we feel a sweet taste when we chew chapati for long?
Answer: Chapatis are full of starch. When we chew a piece of chapati for a long time, the saliva in our mouth has time to break that starch down into sugar. This sugar is what makes it taste sweet, showing that digestion starts in the mouth.
In simple words: Chewing chapati for a while lets saliva turn its starch into sweet sugar.

Exam Tip: Explain that starch is a complex carb that saliva splits into simple sugars, causing the sweet taste.

Question 17. Why is fibre important for a healthy digestive system?
Answer: Fibre adds weight to our solid waste, which helps it move smoothly through our body. It also feeds good bacteria in our gut, keeps our bowel movements regular, and stops us from getting constipated.
In simple words: Fibre helps us digest food smoothly and keeps us from getting constipated.

Exam Tip: Make sure to mention "preventing constipation" and "helping waste pass easily" as key benefits of dietary fibre.

Question 18. How is gas exchange affected during COVID-19 as per the chapter?
Answer: The virus that causes COVID-19 attacks the tiny air sacs in our lungs. This makes it much harder for our lungs to swap oxygen and carbon dioxide, leading to trouble breathing and possible harm to the lungs.
In simple words: The COVID-19 virus damages the air sacs in our lungs, making it hard to breathe.

Exam Tip: Focus on how the virus targets the alveoli, which are the main site of gas exchange.

Question 19. Why do fish need gills and humans have lungs?
Answer: Fish spend their lives underwater, so they need gills to filter out the oxygen dissolved in water. Humans live on land, so we need lungs to take in oxygen from the dry air. Each animal has body parts made for where it lives.
In simple words: Fish use gills to breathe underwater, while humans use lungs to breathe air on land.

Exam Tip: Emphasize the word "adaptation" and explain that gills are for water, while lungs are for air.

Question 20. How do frogs breathe in different stages of life?
Answer: As baby tadpoles, frogs live in water and breathe using gills. Once they grow into adult frogs, they can use lungs on land and breathe through their wet skin when they are underwater. This double way of breathing lets them live on both land and water.
In simple words: Baby frogs use gills, but adult frogs can breathe with lungs on land and through wet skin in water.

Exam Tip: Clearly separate the breathing methods of tadpoles (gills) and adult frogs (lungs and moist skin).

Question 21. What is the difference between breathing and respiration as explained in Class 7 Science Curiosity Chapter 9?
Answer: Breathing and respiration are separate but connected actions. Breathing is a simple physical act where we take in oxygen and push out carbon dioxide. In contrast, respiration is a chemical reaction that occurs inside our cells. It uses the oxygen we breathe to split glucose from our food, producing energy, carbon dioxide, and water. So, breathing gets the gas we need, but respiration actually gives our body the energy to move and live.
In simple words: Breathing is moving air in and out, while respiration is cells turning food into energy using that oxygen.

Exam Tip: Contrast the physical nature of breathing with the cellular, chemical nature of respiration for a complete answer.

Question 22. How does the human digestive system work according to Class 7 Science Curiosity Chapter 9?
Answer: The journey of food starts in the mouth, where we chew it and mix it with saliva. The food then slides down the food pipe into the stomach to be crushed and partly digested. Next, it enters the small intestine, where juices from the liver and pancreas finish breaking it down so nutrients can soak into our blood. Finally, the large intestine takes out remaining water, turning the leftovers into solid waste that leaves through the anus. This whole pathway is called digestion.
In simple words: Food is chewed in the mouth, broken down in the stomach and small intestine, absorbed into the blood, and waste is pushed out.

Exam Tip: Write down the path of food step-by-step in chronological order from mouth to anus.

Question 23. Why do different animals have different breathing mechanisms, as mentioned in Class 7 Science Curiosity Chapter 9?
Answer: Animals live in very different places, so they have developed special ways to breathe where they live. For example, humans use lungs to breathe air. Fish use gills to get oxygen out of water. Frogs use gills when they are young, but adults can use lungs on land and breathe through their wet skin underwater. Earthworms breathe through their slippery skin. These special body parts let each animal get oxygen and get rid of waste gases easily in their own homes.
In simple words: Animals have different breathing parts like gills, lungs, or skin depending on whether they live in water, on land, or both.

Exam Tip: Give examples of at least three different animal breathing systems (like lungs in humans, gills in fish, and moist skin in earthworms) to support your explanation.

Question 24. What are the key life processes we learn about in Class 7 Science Curiosity Chapter 9?
Answer: This chapter teaches us about important activities in animals, such as digestion, breathing, blood flow, and getting rid of waste. It explains how we digest food, how our bodies use oxygen to make energy, and how we clean out waste. We also learn about key organs like our stomach, lungs, heart, and kidneys, and how they work together to keep us healthy and active.
In simple words: We learn how animals eat, breathe, move blood, and remove waste to stay alive.

Exam Tip: List the four major life processes: digestion, respiration, circulation, and excretion.

Question 25. Is the digestion process hard to remember in Class 7 Science Curiosity Chapter 9?
Answer: No, the digestion process is not hard to remember if you follow the path of food step-by-step. Just think of it as a journey starting in the mouth, going down the food pipe, churning in the stomach, absorbing nutrients in the small intestine, and removing water in the large intestine before leaving the body.
In simple words: Digestion is easy to remember if you trace how food travels from your mouth to the exit.

Exam Tip: Draw a simple flow chart showing the path of food to easily memorize the steps of digestion.

Question 26. How can I prepare for Class 7 Science Curiosity Chapter 9 in a simple way?
Answer: You can prepare easily by making a simple list of key organs and their main jobs. Focus on understanding the differences between processes like breathing and respiration, and practice drawing or labeling basic diagrams of the digestive and respiratory systems.
In simple words: Study by learning what each organ does and comparing processes like breathing and respiration.

Exam Tip: Creating flashcards for vocabulary terms like villi, alveoli, and egestion is a great way to study for this chapter.