Life Processes notes

Visit UniversityScope.com

CLASS 10 • SCIENCE • NEXT UNIT

Life Processes

✍ Complete Handwritten-Style Notes

Very Simple English • NCERT-focused • Detailed • Board exam ready

Prepared by UniversityScope • Main Focus Keyword: class 10 Life Processes notes pdf

💬 Join WhatsApp ChannelGet latest notes & updates ✈️ Join Telegram ChannelStudy material • PDFs • Updates 🌐 Visit Our WebsiteNotes • MCQs • Previous Papers

✍ WhatsApp • Telegram • UniversityScope — Study, Revise & Grow!

📖 Chapter Roadmap

1. What Are Life Processes? 2. Nutrition 3. Photosynthesis 4. Human Digestive System 5. Respiration 6. Human Respiratory System 7. Transportation 8. Human Heart and Blood 9. Transport in Plants 10. Excretion 11. Human Excretory System 12. Quick Comparison 13. Important Questions 14. Final Board Revision

Easy study rule: Learn each process in order. First know its meaning. Then learn the main steps. Finally learn the diagram and important terms.

1. What Are Life Processes?

Life processes are the basic activities needed to keep an organism alive.

Main Life Processes

Nutrition

Taking food and using it for energy, growth and repair.

Respiration

Breaking down food to release energy.

Transportation

Moving food, gases and other substances inside the body.

Excretion

Removing harmful waste from the body.

Why Are These Processes Needed?

Cells need energy and materials to work. They also produce waste. Life processes supply useful materials and remove waste.

Board line: Nutrition, respiration, transportation and excretion are important life processes.

2. Nutrition

Nutrition is the process by which an organism takes food and uses it for energy, growth, repair and maintenance.

Types of Nutrition

Type	Meaning	Example
Autotrophic	Organism makes its own food.	Green plants
Heterotrophic	Organism gets food from other organisms.	Humans

Autotrophic Nutrition

Green plants make food by photosynthesis. They use carbon dioxide and water in the presence of sunlight and chlorophyll.

\[6CO_2+6H_2O\xrightarrow{sunlight,\ chlorophyll}C_6H_{12}O_6+6O_2\]

Heterotrophic Nutrition

Humans cannot make their own food. They take food from plants or other animals. The food is then digested and absorbed.

Memory: Plant → makes food. Human → takes food.

3. Photosynthesis

Photosynthesis is the process by which green plants make food using carbon dioxide and water in the presence of sunlight and chlorophyll.

Main Steps

1. Step 1: Roots absorb water and minerals from soil.
2. Step 2: Carbon dioxide enters leaves through stomata.
3. Step 3: Chlorophyll traps sunlight.
4. Step 4: Light energy helps convert carbon dioxide and water into food.
5. Step 5: Oxygen is released as a by-product.

Stomata

Stomata are tiny pores mainly present on the surface of leaves. They help in exchange of gases.

Role of Chlorophyll

Chlorophyll absorbs light energy. This energy is used during photosynthesis.

Do not forget: Photosynthesis needs carbon dioxide, water, sunlight and chlorophyll.

4. Human Digestive System

Digestion is the process of breaking complex food into simpler substances that the body can absorb and use.

Path of Food

Mouth → Oesophagus → Stomach → Small intestine → Large intestine → Rectum → Anus

Digestion in Different Parts

Part	Main Work
Mouth	Food is chewed. Saliva starts digestion of starch.
Oesophagus	Moves food to the stomach by peristalsis.
Stomach	HCl and enzymes help digest food, especially proteins.
Small intestine	Completes digestion and absorbs digested food.
Large intestine	Absorbs extra water.
Rectum and anus	Store and remove undigested waste.

Role of Bile

Bile is made by the liver. It helps in the digestion of fats by breaking large fat globules into smaller droplets.

Role of Pancreatic Juice

Pancreatic juice contains enzymes that help digest carbohydrates, proteins and fats.

5. Respiration

Respiration is the process of breaking down food to release energy for life activities.

Aerobic Respiration

It occurs in the presence of oxygen. It releases a large amount of energy.

\[\text{Glucose}+O_2\rightarrow CO_2+H_2O+\text{Energy}\]

Anaerobic Respiration

It occurs without oxygen. It releases less energy.

Feature	Aerobic	Anaerobic
Oxygen	Required	Not required
Energy	More energy	Less energy
End products	CO₂ + water	Different products depending on organism

Respiration in Muscles

During heavy exercise, oxygen supply may become insufficient. Muscle cells can form lactic acid by anaerobic respiration. This can cause muscle cramps.

Memory: Aerobic = oxygen + more energy. Anaerobic = no oxygen + less energy.

6. Human Respiratory System

Path of Air

Nostrils → Nasal passage → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

Alveoli

Alveoli are tiny air sacs in the lungs. They provide a large surface for exchange of gases.

Why Are Alveoli Good for Gas Exchange?

1. Step 1: They have a very large surface area.
2. Step 2: Their walls are very thin.
3. Step 3: They have a rich blood supply.
4. Step 4: Oxygen can move into blood and carbon dioxide can move out.

Breathing vs Respiration

Breathing	Respiration
Taking in oxygen and giving out carbon dioxide.	Releasing energy from food.
Physical process.	Biochemical process.
Occurs through respiratory organs.	Occurs inside cells.

7. Transportation

Transportation means movement of substances such as food, oxygen, carbon dioxide and wastes from one part of the body to another.

Transportation in Humans

The human transport system mainly contains heart, blood and blood vessels.

Heart

Acts as a pump and keeps blood moving.

Blood

Carries oxygen, food, hormones and wastes.

Arteries

Carry blood away from the heart.

Veins

Carry blood towards the heart.

Capillaries

Very thin vessels where exchange with tissues occurs.

Blood Components

Component	Main Function
Red blood cells	Carry oxygen using haemoglobin.
White blood cells	Help protect the body from infection.
Platelets	Help in blood clotting.
Plasma	Carries dissolved substances in blood.

8. Human Heart and Blood Circulation

Four Chambers of Heart

Chamber	Receives / Pumps
Right atrium	Receives deoxygenated blood from the body.
Right ventricle	Pumps blood to the lungs.
Left atrium	Receives oxygenated blood from the lungs.
Left ventricle	Pumps oxygenated blood to the body.

Double Circulation

In humans, blood passes through the heart twice during one complete cycle of circulation. This is called double circulation.

1. Step 1: Body → right side of heart.
2. Step 2: Right side → lungs.
3. Step 3: Lungs → left side of heart.
4. Step 4: Left side → whole body.

Why Is Double Circulation Useful?

It keeps oxygenated and deoxygenated blood separate. It helps supply oxygen efficiently to the body.

Easy memory: Right side → lungs. Left side → body.

9. Transport in Plants

Xylem

Xylem carries water and minerals from roots to other parts of the plant.

Phloem

Phloem carries food made in leaves to other parts of the plant.

Tissue	Transports	Main Direction
Xylem	Water and minerals	Mainly roots → upward
Phloem	Food	From source to parts needing/storing food

Transpiration

Transpiration is the loss of water as water vapour from the aerial parts of plants, mainly through stomata.

Why Is Transpiration Important?

• It helps create a pull for movement of water.
• It helps cool the plant.
• It supports movement of water and minerals.

10. Excretion

Excretion is the removal of harmful metabolic wastes from the body.

Excretion in Humans

The main waste product from protein metabolism is urea. Kidneys remove urea and other wastes from blood and form urine.

Main Excretory Organs

Kidneys

Filter blood and form urine.

Ureters

Carry urine from kidneys to urinary bladder.

Urinary bladder

Stores urine for some time.

Urethra

Carries urine out of the body.

Other Waste Removal

Lungs remove carbon dioxide and water vapour. Skin removes some water and salts through sweat.

11. Human Excretory System

Nephron

Nephron is the basic filtering unit of the kidney.

Urine Formation: Easy Steps

1. Step 1: Filtration — Blood is filtered in the nephron.
2. Step 2: Reabsorption — Useful substances such as water, glucose and some salts are taken back into the blood.
3. Step 3: Secretion — Some additional wastes are added to the filtrate.
4. Step 4: Urine — The remaining liquid becomes urine and passes to the urinary bladder.

Dialysis

If kidneys fail to filter blood properly, an artificial method called dialysis may be used to remove wastes from blood.

Board point: Learn the functions of kidney, nephron and urinary bladder clearly.

12. Life Processes: Quick Comparison

Life Process	Main Work	Key Term
Nutrition	Obtaining and using food	Digestion
Respiration	Release of energy from food	Glucose + oxygen
Transportation	Movement of substances	Heart, blood, vessels
Excretion	Removal of wastes	Kidney, nephron
Photosynthesis	Making food in green plants	Chlorophyll

Must-Know Differences

Question	Answer
Xylem vs Phloem	Xylem carries water and minerals; phloem carries food.
Artery vs Vein	Artery carries blood away from heart; vein carries blood towards heart.
Aerobic vs Anaerobic	Aerobic uses oxygen and releases more energy; anaerobic does not use oxygen and releases less energy.
Breathing vs Respiration	Breathing is gas exchange; respiration releases energy from food.

13. Class 10 Life Processes Important Questions

Very Short Answer Questions

1. What are life processes?
Basic activities needed to keep an organism alive.

2. What is nutrition?
The process of taking and using food.

3. What is photosynthesis?
The process by which green plants make food using carbon dioxide and water in the presence of sunlight and chlorophyll.

4. What is respiration?
The process of releasing energy from food.

5. What is a nephron?
The basic filtering unit of a kidney.

Short Answer Questions

1. Why are life processes necessary?
2. Differentiate between autotrophic and heterotrophic nutrition.
3. Explain the main steps of photosynthesis.
4. Explain digestion in the human alimentary canal.
5. Differentiate between aerobic and anaerobic respiration.
6. Why are alveoli suitable for gas exchange?
7. Explain the functions of blood components.
8. What is double circulation?
9. Differentiate between xylem and phloem.
10. Explain the role of nephron in urine formation.

Long Answer Questions

1. Explain nutrition in humans with the role of different digestive organs.
2. Explain human respiration and the mechanism of gas exchange.
3. Explain the structure and working of the human heart.
4. Explain transportation in plants and the role of xylem and phloem.
5. Explain the human excretory system and urine formation.

14. ⭐ Final Board Exam Revision

Must Learn Definitions

• Life processes
• Nutrition
• Photosynthesis
• Respiration
• Breathing
• Transportation
• Double circulation
• Transpiration
• Excretion
• Nephron

Must Learn Equations

\[6CO_2+6H_2O\xrightarrow{sunlight,\ chlorophyll}C_6H_{12}O_6+6O_2\]

\[\text{Glucose}+O_2\rightarrow CO_2+H_2O+\text{Energy}\]

⚠ Common Mistakes

• Do not confuse breathing with respiration.
• Remember that xylem carries water and minerals.
• Remember that phloem carries food.
• Do not confuse arteries and veins.
• Remember that the left ventricle pumps blood to the whole body.
• Learn the correct order of the digestive tract.
• Remember that nephron is the filtering unit of the kidney.

📝 Last-Minute Checklist

• ☐ Life processes
• ☐ Nutrition
• ☐ Photosynthesis
• ☐ Digestion
• ☐ Respiration
• ☐ Alveoli
• ☐ Transportation
• ☐ Heart
• ☐ Blood
• ☐ Double circulation
• ☐ Xylem and phloem
• ☐ Transpiration
• ☐ Excretion
• ☐ Nephron

🎯 Board method: Write answers in simple steps. For a 3-mark answer use definition + 2–3 points + diagram/equation when needed. Label diagrams clearly.

✍ Practice Corner

Try these yourself before checking your textbook:

1. What are life processes?
2. Why is nutrition necessary?
3. Write the photosynthesis equation.
4. Explain digestion in the small intestine.
5. What is the difference between aerobic and anaerobic respiration?
6. Why are alveoli important?
7. What are the functions of red blood cells and platelets?
8. Explain double circulation.
9. Differentiate between xylem and phloem.
10. What is transpiration?
11. What is a nephron?
12. Explain urine formation in three main steps.

Answer-writing tip: Keep every answer short and clear: meaning → main points → reason/example. Draw a neat labelled diagram when the question asks for a system or structure.

📲 Study More With Us

💬 Join WhatsApp ChannelNotes & updates ✈️ Join Telegram ChannelStudy material & PDFs 🌐 Visit Our WebsiteNotes • MCQs • Papers

universityscope.com

✍ Class 10 Science • Life Processes
Handwritten-style educational notes • Very Simple English • Mobile friendly