CBSE Class 10 Science • Revision 2026
Life Processes Class 10 Worksheet with Answers
How does food reach your cells, why do plants need transport tissues, and how do kidneys remove waste? Practise these concepts with the Life Processes Class 10 worksheet. Use MCQs, assertion–reason questions, case-based questions and written answers to revise nutrition, respiration, transportation and excretion.
This Life Processes worksheet helps you move from remembering definitions to explaining how living organisms function. Attempt the questions independently, then use the answers and solutions to check your reasoning. It is useful for classroom revision, homework and preparing for a Class 10 Science chapter test.
For concept revision before practice, read our Life Processes Class 10 notes and mind map . Combine the notes with worksheet practice to strengthen definitions, process sequences, comparisons and diagram-based answers.
What Does the Life Processes Worksheet Cover?
The worksheet follows a mixed-question format so students can practise both factual recall and application. When answering Life Processes Class 10 questions, explain the connection between an organ’s structure and its function.
- MCQs with solutions: identify correct organs, enzymes, tissues and biological processes.
- Assertion–reason questions: check whether both statements are true and whether the reason explains the assertion.
- Case-based questions: apply concepts to passages about digestion, respiration, circulation and excretion.
- Very short answers: practise definitions, examples and one-mark responses.
- Short and long answers: explain mechanisms, compare processes and organise answers in logical steps.
Life Processes Class 10 Summary
Life processes are the maintenance activities needed to keep an organism alive. This chapter focuses on obtaining nutrients, releasing energy, transporting materials and removing metabolic waste. The following table provides Life Processes Class 10 short notes for revision before attempting the worksheet.
| Process | Main function | Key topics to revise |
|---|---|---|
| Nutrition | Obtaining and using food for energy, growth and repair. | Photosynthesis, Amoeba, digestion, enzymes and villi. |
| Respiration | Breaking down food to release usable energy. | Aerobic and anaerobic pathways, breathing and alveoli. |
| Transportation | Moving substances between different parts of an organism. | Heart, blood vessels, lymph, xylem and phloem. |
| Excretion | Removing waste produced by metabolic activities. | Kidneys, nephrons, urine formation and plant wastes. |
Nutrition: From Food to Absorption
Green plants show autotrophic nutrition. They use light energy captured by chlorophyll to prepare carbohydrates from carbon dioxide and water. Animals obtain food from other organisms and show heterotrophic nutrition.
Overall photosynthesis equation:
6CO2 + 6H2O → C6H12O6 + 6O2
Conditions: sunlight and chlorophyll.
In humans, salivary amylase starts starch digestion in the mouth. The stomach provides an acidic medium for pepsin to digest proteins. Most digestion and absorption take place in the small intestine. Its villi increase the surface area available for absorbing digested nutrients.
Respiration: Releasing Energy from Food
Breathing moves air into and out of the lungs; cellular respiration releases energy from food inside cells. Glucose first breaks down into pyruvate in the cytoplasm. In aerobic respiration, further breakdown occurs in mitochondria using oxygen, producing carbon dioxide, water and energy.
Without oxygen, yeast can produce ethanol and carbon dioxide. When oxygen supply is insufficient in muscle cells, pyruvate can form lactic acid. These pathways release less energy per glucose molecule than aerobic respiration.
Transportation: Moving Materials Around
Blood transports oxygen, nutrients and wastes. The heart pumps blood through pulmonary circulation between the heart and lungs, and systemic circulation between the heart and the rest of the body. In plants, xylem carries water and minerals, while phloem transports food from sources to regions where it is used or stored.
Excretion: Removing Metabolic Waste
Nephrons are the functional units of kidneys. Blood is filtered, useful substances and much of the water are selectively reabsorbed, and remaining waste forms urine. Urine passes through the ureters to the urinary bladder and leaves through the urethra.
Life Processes Class 10 Important Questions with Answers
Use these Life Processes Class 10 extra questions with answers to practise explaining a biological fact rather than simply naming it.
Why Does Bile Help in Fat Digestion?
Answer: Bile is produced by the liver and stored in the gallbladder. It breaks large fat globules into smaller droplets through emulsification, increasing the surface area available for lipase. It also helps provide a suitable alkaline medium in the small intestine.
Remember: Bile contains no digestive enzymes. Emulsification helps digestion but does not itself chemically break fats into fatty acids and glycerol.
How Are Alveoli Adapted for Gas Exchange?
Answer: Numerous alveoli provide a large surface area. Their thin, moist walls and surrounding capillaries allow oxygen and carbon dioxide to diffuse efficiently between air and blood.
Trace the Route of Blood Through the Heart
Body → venae cavae → right atrium → right ventricle → pulmonary artery → lungs.
Lungs → pulmonary veins → left atrium → left ventricle → aorta → body.
Blood passes through the heart twice during one complete circuit. This is called double circulation.
Life Processes Class 10 MCQs and Assertion–Reason Practice
Attempt these sample Life Processes Class 10 MCQs before opening the answers. For assertion–reason questions, evaluate each statement separately.
1. Which tissue transports food in plants?
A. Xylem
B. Phloem
C. Epidermis
D. Cork
Answer: B. Phloem. Phloem transports sugars from sources, such as leaves, to growing or storage regions. Transport can occur upwards or downwards depending on the source and sink.
2. Which blood vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Vena cava
C. Pulmonary vein
D. Renal artery
Answer: C. Pulmonary vein. It carries oxygenated blood to the left atrium. A vein is defined by the direction of blood flow towards the heart.
3. Assertion: Bile helps fat digestion. Reason: Bile contains fat-digesting enzymes.
Answer: The assertion is true, but the reason is false. Bile emulsifies fats; lipase is the enzyme that digests them.
Life Processes Case-Based Question with Answers
A student observes that breathing becomes faster after running. The teacher explains that working muscles need more energy and produce more carbon dioxide.
Question 1: Why does breathing become faster?
Faster breathing helps increase oxygen supply and remove the extra
carbon dioxide produced during increased cellular respiration.
Question 2: Is breathing the same as respiration?
No. Breathing is the movement of air, while cellular respiration is
the breakdown of food to release energy.
Question 3: What can happen if muscle cells receive insufficient oxygen?
Pyruvate can be converted into lactic acid, releasing less energy
than the aerobic pathway.
Life Processes Class 10 Diagrams to Practise
For Life Processes Class 10 diagrams, practise clear labels and explain what each structure does. A neat diagram becomes more useful when you can connect it to a process.
- Human digestive system: label the alimentary canal, liver and pancreas.
- Human heart: label chambers and major vessels, then add arrows showing blood flow.
- Nephron: identify the glomerulus, Bowman’s capsule, tubule and collecting duct.
- Stomata: label guard cells and the stomatal pore; explain gas exchange and water loss.
How to Use This Worksheet as a Chapter Test
First revise the summary, then attempt the worksheet without looking at the solutions. Check your answers and record mistakes under definitions, diagrams, comparisons or process sequences. Repeat the questions you found difficult after revising those topics.
For Life Processes Class 10 1 mark questions and answers, give a precise response. For longer answers, include the relevant steps and explain why they occur.
Frequently Asked Questions About Life Processes Class 10
What are the main topics in Life Processes Class 10?
The main topics are nutrition, respiration, transportation and excretion. Revise plant and human processes, relevant organs, transport tissues and the relationship between structure and function.
Why is diffusion alone insufficient in multicellular organisms?
Many cells are far from the body surface. Diffusion over long distances is too slow to meet their needs, so specialised transport systems deliver materials and remove wastes.
Do plants respire during the day or only at night?
Plants respire throughout the day and night because their cells continuously need energy. Photosynthesis requires light, so it occurs when suitable light is available.
Why is the small intestine suitable for absorption?
It has numerous villi that increase surface area. Their thin walls and transport connections help absorbed nutrients move away, supporting efficient absorption.
Do all arteries carry oxygenated blood?
No. Arteries carry blood away from the heart. The pulmonary artery carries deoxygenated blood to the lungs, while pulmonary veins return oxygenated blood to the heart.
Why is double circulation useful in humans?
It keeps oxygenated and deoxygenated blood separate and supports efficient oxygen delivery to body tissues. This helps meet the energy requirements of the human body.
What happens during urine formation?
Blood is filtered in the glomerulus. Useful substances and much of the water are selectively reabsorbed along the nephron, while certain additional wastes enter the tubule through secretion. The remaining fluid forms urine.
What is the difference between excretion and egestion?
Excretion removes metabolic wastes, such as urea. Egestion removes undigested food from the digestive tract. Passing urine is excretion; passing undigested food as faeces is egestion.
How should I prepare Life Processes Class 10 exercise questions and answers?
Revise the concepts, attempt textbook exercises independently, and practise mixed worksheet questions. Focus on explaining processes, comparing systems and drawing labelled diagrams instead of memorising answer wording.
Where can I revise Life Processes Class 10 notes and a mind map?
Visit our Life Processes Class 10 notes and mind map page for the related revision resource. Return to this worksheet afterwards to test your understanding.
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