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Class 10 → Science → Chapter 5: Life Processes
I. Chapter Summary:
Life processes are the basic functions performed by living organisms to maintain life. This chapter explains how organisms obtain energy and nutrients through processes like nutrition, respiration, transportation, and excretion. It highlights differences between plants and animals and explains how systems like the digestive system, circulatory system, and excretory system work together to sustain life.
II. Key Concepts Covered:
1. Life Processes
Processes necessary for maintaining life such as nutrition, respiration, transport, and excretion.
2. Nutrition
- Autotrophic Nutrition: Plants make food using sunlight (photosynthesis).
- Heterotrophic Nutrition: Animals depend on others for food (holozoic, saprophytic, parasitic).
3. Photosynthesis
Plants prepare food using CO₂, water, sunlight, and chlorophyll.
4. Human Digestive System
Includes organs like mouth, oesophagus, stomach, small intestine, large intestine.
5. Respiration
- Breakdown of glucose to release energy.
- Types: Aerobic and Anaerobic respiration.
6. Transportation
- In humans: Blood, heart, blood vessels.
- In plants: Xylem and phloem.
7. Excretion
Removal of metabolic waste.
- Humans: Kidneys, urine formation.
- Plants: Removal through leaves, roots, etc.
III. Important Questions:
(A) MCQs (1 Mark)
- Which pigment is necessary for photosynthesis?
(a) Haemoglobin
(b) Chlorophyll ✅
(c) Melanin
(d) Carotene - Which organ filters blood in humans?
(a) Liver
(b) Kidney ✅
(c) Heart
(d) Lung - Anaerobic respiration produces:
(a) Oxygen
(b) Carbon dioxide and alcohol ✅
(c) Water
(d) Nitrogen - Transport of food in plants occurs through:
(a) Xylem
(b) Phloem ✅
(c) Stomata
(d) Roots
(B) Short Answer Questions (2/3 Marks)
- Define autotrophic nutrition with an example.
- What is the role of enzymes in digestion?
- Differentiate between aerobic and anaerobic respiration.
- Explain the function of xylem and phloem.
(C) Long Answer Questions (5 Marks)
- Explain the process of photosynthesis with a diagram.
- Describe the human digestive system and its functions.
- Explain transportation in humans with the help of a diagram of the heart.
- Describe the excretory system in humans and the formation of urine.
(D) HOTS Questions
- Why do plants not require a circulatory system like humans?
- How would life be affected if the process of excretion stopped in humans?
IV. Key Formulas/Concepts:
Photosynthesis Equation:
$6CO_2 + 6H_2O xrightarrow{text{sunlight, chlorophyll}} C_6H_{12}O_6 + 6O_2$
Respiration Equation:
$C_6H_{12}O_6 + 6O_2 rightarrow 6CO_2 + 6H_2O + text{energy}$
Important Definitions:
- Assimilation: Conversion of absorbed food into body tissues.
- Transpiration: Loss of water from plant leaves.
- Dialysis: Artificial removal of waste from blood.
V. Deleted Portions (CBSE 2025–2026):
- Detailed structure of nephron (some parts simplified)
- Some complex biochemical pathways in respiration
VI. Chapter-Wise Marks Bifurcation (Estimated – CBSE 2025–2026):
| Unit/Chapter | Estimated Marks | Type of Questions Typically Asked |
|---|---|---|
| Life Processes | 10–12 Marks | MCQs, Case-based, Short & Long Answer |
⚠️ Note: This is an estimate. Actual marks may vary.
VII. Previous Year Questions (PYQs):
1 Mark
- What is transpiration? (2020)
2/3 Marks
- Differentiate between arteries and veins. (2019)
- What is double circulation? (2020)
5 Marks
- Explain human respiratory system. (2022)
- Describe the process of nutrition in humans. (2021)
VIII. Real-World Application Examples:
- Photosynthesis → Basis of food chains and oxygen supply.
- Respiration → Used in sports science and fitness training.
- Circulatory system → Helps understand heart diseases and blood pressure.
- Excretion → Important in medical treatments like dialysis.
IX. Student Tips & Strategies for Success:
Time Management
- Divide time between theory and diagrams.
- Practice daily for 30–45 minutes.
Exam Preparation
- Focus on diagrams (heart, digestive system).
- Revise NCERT questions thoroughly.
Stress Management
- Take short breaks.
- Practice deep breathing and stay consistent.
X. Career Guidance & Exploration:
After Class 10, students can choose:
Science Stream
- Careers: Doctor, Engineer, Biotechnologist
- Exams: NEET, JEE Main
Commerce Stream
- Careers: CA, Business, Finance
Arts Stream
- Careers: Civil Services, Teaching, Psychology
XI. Important Notes:
- Always refer to CBSE official updates.
- NCERT textbook is the most important resource.
- Practice diagrams and case-based questions regularly.
- Focus on conceptual clarity rather than rote learning.