by Tiwari Academy
NCERT Solutions for Class 7 Science Curiosity Chapter 9 Life Processes in Animals updated for Session 2025-26. Grade 7th Science Curiosity Solutions give clear and accurate explanations of key concepts such as digestion, respiration, circulation and excretion in various animals. These solutions help students understand how different organisms carry out essential life functions through structured answers, diagrams and real-life examples. Aligned with NEP-2020, they promote conceptual clarity, scientific thinking and application-based learning, making them ideal for exam preparation and deeper understanding of biology.
Class 7 Science Solutions
Class 7 Science Curiosity Chapter 9 Solutions
Class 7 Science Curiosity Chapter 9 Very Short Answer Type Questions
What are life processes?
See AnswerLife processes are essential functions like nutrition, respiration, circulation, excretion, and reproduction needed for the survival of living beings.
What is the role of saliva in digestion?
See AnswerSaliva breaks down starch into sugar and moistens food for easy swallowing.
Name the organ where absorption of digested food occurs.
See AnswerSmall intestine.
What is egestion?
See AnswerThe process of removing undigested waste from the body through the anus.
What is the function of alveoli in lungs?
See AnswerAlveoli allow exchange of oxygen and carbon dioxide between lungs and blood.
Class 7 Science Curiosity Chapter 9 Short Answer Type Questions
What is rumination? Name animals that ruminate.
See AnswerRumination is the process where partially digested food is brought back to the mouth for thorough chewing. Cows, goats and buffaloes are examples of ruminants.
What happens to the food in the stomach during digestion?
See AnswerThe stomach churns the food and mixes it with digestive juices, acid, and mucus. Proteins are broken down here and harmful bacteria are destroyed.
What does the liver secrete and what is its function?
See AnswerThe liver secretes bile, which neutralises stomach acid and helps in breaking down fats into tiny droplets.
What is the difference between breathing and respiration?
See AnswerBreathing is the physical movement of air in and out of the body, while respiration is a chemical process where oxygen breaks down glucose to release energy.
What happens to undigested food in the large intestine?
See AnswerWater and salts are absorbed, and the rest is stored as semi-solid waste (stool) in the rectum, then eliminated through the anus.
Class 7 Science Curiosity Chapter 9 Descriptive Answer Type Questions
Explain the process of digestion in the mouth.
See AnswerIn the mouth, teeth crush food (mechanical digestion), and saliva starts chemical digestion by breaking starch into sugar. The tongue helps mix food and saliva and pushes it into the oesophagus.
How is the small intestine adapted for absorption?
See AnswerThe small intestine has a large surface area due to finger-like projections called villi. These villi absorb nutrients into the blood, which transports them to different body parts.
How does a bird digest food without teeth?
See AnswerBirds have a gizzard, a muscular chamber that crushes food with the help of swallowed stones and muscular movement, breaking it down before passing it to the intestine.
Describe the human respiratory system briefly.
See AnswerAir enters through nostrils, passes the nasal passages and windpipe, and reaches the lungs. In the lungs, it enters alveoli where gas exchange occurs oxygen goes to blood and carbon dioxide is exhaled.
What is the role of the diaphragm in breathing?
See AnswerThe diaphragm moves downward during inhalation, increasing chest space and drawing air in. During exhalation, it moves upward, reducing space and pushing air out.
Class 7 Science Curiosity Chapter 9 Exploring Questions
Why do we feel a sweet taste when we chew chapati for long?
See AnswerChapati contains starch. Saliva breaks starch into sugar during prolonged chewing, causing a sweet taste. This demonstrates the start of digestion in the mouth.
Why is fibre important for a healthy digestive system?
See AnswerFibre helps form bulk in stools, making them easier to pass. It also supports gut bacteria, promotes bowel regularity and prevents constipation.
How is gas exchange affected during COVID-19 as per the chapter?
See AnswerThe SARS-CoV-2 virus affects alveoli in the lungs, reducing gas exchange efficiency. This leads to breathing difficulties and sometimes lung damage.
Why do fish need gills and humans have lungs?
See AnswerFish live in water and extract dissolved oxygen through gills. Humans live on land and use lungs to absorb oxygen from air. Their breathing organs are adapted to their environments.
How do frogs breathe in different stages of life?
See AnswerTadpoles breathe through gills in water. Adult frogs use lungs on land and breathe through their moist skin in water. This dual method helps them survive in both habitats.
What is the difference between breathing and respiration as explained in Class 7 Science Curiosity Chapter 9?
In Class 7 Science Curiosity Chapter 9, breathing and respiration are clearly defined as two different but related processes. Breathing is a physical process involving the inhalation of oxygen and exhalation of carbon dioxide through organs like the lungs. Respiration, on the other hand, is a chemical process that takes place inside cells. It uses the oxygen we inhale to break down glucose (from food) and release energy, along with carbon dioxide and water as by-products. While breathing helps bring in oxygen and remove waste gases, respiration is what actually provides the body with the energy to function.
How does the human digestive system work according to Class 7 Science Curiosity Chapter 9?
Class 7 Science Curiosity Chapter 9 explains that the human digestive system begins with the mouth, where food is chewed and mixed with saliva. It then moves through the oesophagus to the stomach, where it is churned and partially digested. The small intestine receives digestive juices from the liver and pancreas to further break down the food. Nutrients are absorbed through the walls of the small intestine into the blood. The large intestine absorbs water and forms solid waste, which is stored in the rectum and expelled through the anus. This entire process is called digestion.
Why do different animals have different breathing mechanisms, as mentioned in Class 7 Science Curiosity Chapter 9?
As stated in Class 7 Science Curiosity Chapter 9, different animals live in different environments and therefore have adapted distinct breathing mechanisms. Humans and many land animals breathe through lungs. Fish have gills that extract oxygen from water. Amphibians like frogs breathe through gills as tadpoles, lungs on land and skin in water. Earthworms exchange gases through their moist skin. These adaptations help animals survive in their specific habitats by ensuring that their bodies can take in oxygen and release carbon dioxide efficiently, regardless of whether they live on land, in water or both.
What are the key life processes we learn about in Class 7 Science Curiosity Chapter 9?
In Chapter 9, you’ll learn about important life processes in animals like digestion, respiration, circulation and excretion. The chapter explains how the body breaks down food, how oxygen is used to release energy and how waste is removed. It also covers organs like the stomach, lungs, heart and kidneys and how they work together to keep animals (including us!) alive and healthy.
Is the digestion process hard to remember in Class 7 Science Curiosity Chapter 9?
Not at all! Just think of it as a step-by-step journey of food—from the mouth to the esophagus, stomach, small and large intestines and finally out of the body. Focus on what happens at each stage. Simple diagrams and real-life examples (like chewing food or stomach growling) make it easy to remember. Also, remember key organs like the liver and pancreas play supporting roles.
How can I prepare for Class 7 Science Curiosity Chapter 9 in a simple way?
To prepare easily:
1. Draw flowcharts for digestion and respiration.
2. Make flashcards for terms like alveoli, ruminants, enzymes, etc.
3. Try to relate each process to your body like breathing, eating or sweating.
4. Watch short science videos if needed.
With practice and simple explanations, this chapter becomes one of the easiest and most relatable topics in science.
