CBSE Class 10 Science Chapter 6 Life Processes NCERT Solutions
This comprehensive set of NCERT Solutions for Class 10 Science, Chapter 6, "Life Processes," delves into the fundamental biological mechanisms that sustain living organisms. It covers essential topics such as nutrition in plants and animals, the process of respiration, the transport of essential substances within organisms, and the vital function of excretion. The solutions provide clear, step-by-step explanations for various questions, helping students grasp complex concepts like photosynthesis, digestion, circulation, and waste removal. These solutions are designed to aid students in understanding the core principles of life processes, reinforcing their knowledge, and preparing effectively for their board examinations by offering accurate and easy-to-understand answers.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 10 |
| Subject | Science (Exemplar) |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | 6. Life Processes |
Chapter summary
Chapter 6, "Life Processes," of the NCERT Class 10 Science solutions focuses on the essential functions that living beings perform to survive. This chapter's solutions explain the different modes of nutrition, including autotrophic and heterotrophic, and detail the processes of digestion, respiration, transport of materials (like blood circulation), and excretion. The exercises cover key concepts and their applications, providing a solid foundation for understanding biological systems.
Learning outcomes
- Understand the characteristics of autotrophs and heterotrophs.
- Identify the correct sequence of organs in the human alimentary canal.
- Explain the role of salivary amylase in digestion.
- Recognize the protective lining of the stomach.
- Identify the organ that receives bile from the liver.
Topics covered
Paper topics
- Autotrophs
- Heterotrophs
- Photosynthesis
- Human Digestive System
- Alimentary Canal
- Salivary Amylase
- Hydrochloric Acid
- Bile
- Starch Digestion
- Food Breakdown
- Trophic Levels
- Nutrition
Important topics
- Life Processes Overview
- Autotrophic Nutrition
- Human Digestive System Sequence
- Role of Digestive Enzymes
- Protection of Stomach Lining
- Bile's Function in Digestion
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Questions and Solutions
Multiple Choice Questions
1. Which of the following statements about the autotrophs is incorrect?
(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains
2. In which of the following groups of organisms, food material is broken down outside the body and absorbed?
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm
3. Select the correct statement
(a) Heterotrophs do not synthesise their own food
(b) Heterotrophs utilise solar energy for photosynthesis
(c) Heterotrophs synthesise their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates
1. Which is the correct sequence of parts in human alimentary canal?
(a) Mouth <math>→</math> stomach <math>→</math> small intestine <math>→</math> oesophagus <math>→</math> large intestine
(b) Mouth <math>→</math>oesophagus <math>→</math> stomach <math>→</math> large intestine <math>→</math> small intestine
(c) Mouth <math>→</math> stomach <math>→</math> oesophagus <math>→</math> small intestine <math>→</math> large intestine
(d) Mouth <math>→</math> oesophagus <math>→</math> stomach <math>→</math> small intestine <math>→</math> large intestine
2. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins
3. The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile
4. Which part of alimentary canal receives bile from the liver?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Oesophagus
Common mistakes
- Confusing the order of organs in the digestive system.
- Misunderstanding the specific roles of enzymes like salivary amylase.
- Incorrectly identifying the functions of different parts of the alimentary canal.
Revision tips
- Review the definitions of autotrophs and heterotrophs.
- Memorize the correct sequence of the human digestive system.
- Understand the function of each digestive enzyme and its location.
- Pay attention to the protective mechanisms within the digestive tract.
Practice MCQs
Q1. Which statement about autotrophs is incorrect?
Explanation: Autotrophs require sunlight and chlorophyll to perform photosynthesis and synthesize carbohydrates. They cannot convert carbon dioxide and water into carbohydrates in the absence of sunlight.
Q2. In which group of organisms is food digested externally before absorption?
Explanation: Yeast, mushroom, and bread mould are saprophytes. They secrete digestive enzymes externally onto the food material, break it down, and then absorb the digested nutrients.
Q3. Which of the following is a correct statement about heterotrophs?
Explanation: Heterotrophs are organisms that cannot produce their own food and rely on other organisms or organic matter for nutrition. They do not perform photosynthesis.
Q4. What is the correct sequence of parts in the human alimentary canal?
Explanation: The correct path of food through the human digestive system is from the mouth, through the oesophagus to the stomach, then to the small intestine, followed by the large intestine, and finally elimination.
Q5. If salivary amylase is absent, which digestive process in the mouth will be affected?
Explanation: Salivary amylase is an enzyme present in saliva that begins the digestion of starch by breaking it down into simpler sugars. Its absence directly impacts this specific process.
Q6. The inner lining of the stomach is protected from hydrochloric acid by:
Explanation: Mucus is secreted by the stomach lining and forms a protective layer that shields the stomach wall from the corrosive effects of hydrochloric acid and digestive enzymes.
Q7. Which part of the alimentary canal receives bile secreted by the liver?
Explanation: Bile, produced by the liver and stored in the gallbladder, is released into the small intestine to aid in the digestion and absorption of fats.
Frequently asked questions
What are the main life processes covered in this chapter?
This chapter covers essential life processes such as nutrition (autotrophic and heterotrophic), respiration, transport of substances within organisms, and excretion.
Why is it important to understand the sequence of the human alimentary canal?
Understanding the sequence is crucial because it outlines the path food takes for digestion and absorption, highlighting the specific roles of each organ in breaking down food and absorbing nutrients.
What is the role of mucus in the stomach?
Mucus protects the inner lining of the stomach from the damaging effects of hydrochloric acid and digestive enzymes, preventing self-digestion.
How do these NCERT solutions help in exam preparation?
These solutions provide clear, step-by-step answers to common questions, helping students understand complex biological processes and reinforcing their knowledge for effective exam revision.
What is the difference between autotrophs and heterotrophs?
Autotrophs produce their own food using light energy (like plants), while heterotrophs obtain food by consuming other organisms.
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