Chapter 6 Life Processes
Hi, my students! Today, we will study the most important chapter in Class 10. “Processes of Life.” This chapter is hard, but it’s important for your tests and for learning how the body works every day.
Think about how your body works every day. How does the body digest food? How does the blood get oxygen? How does the body get rid of things it doesn’t need? All of these questions will be answered in this chapter! Important facts about this chapter:
Board exams contain 7–10 marks of questions
Can you have a questions in science practical exams
Understanding who a diagrams is essential
You need to remember the definitions.
1. What are life processes? Definition and Importance
Definition:
Life processes are the biological activities that keep living things alive. This includes reproduction, development, movement, respiration, nutrition, transportation, and excretion.
Let’s use a simple example to help us understand:
Your phone needs a charged battery to work, needs the right nutrients, and needs to get rid of waste.
Your body also needs energy (ATP) and nutrients and to get rid of carbon dioxide.
2. Main Parts of Life Processes:
Nutrition: The Best Way to Live
Describe nutrition.
Nutrition: We consume food to obtain and utilize energy.
Respiration
We have food that gives us energy.
Transportation
Our organ carries things from one place to another.
Excretion
It’s removing waste materials
Growth
growth in size
Reproduction
Producing young ones
2. All these processes work together.
Nutrition
The process of supplying organisms with energy and building materials.
This means:
Food generates energy.
Food helps your body develop muscles, bones, and skin.
Different types of nutrition
1. Autotrophic Nutrition.
Autotrophic organisms produce their own food from basic materials.
Examples include algae and green plants.
Photosynthesis formula:
6CO₂ + 6H₂O + Sunlight → C₆H₂₂O₆ + 6O₂
2. Heterotrophic Nutrition
Heterotrophic nutrition refers to organisms that are dependent on others.
Examples include humans, animals, and fungi.
Types of Heterotrophic Nutrition
Animals consume solid food during the Holozoic era.
“Saprophytic” means that it eats dead things.
Parasitic—It depends on the host body.
The digestive system of the human body
Food is digested in the following steps:
1. Ingestion: We take food with our mouths.
2. digestion – It breaks down food into simple substances.
3. Absorption: Nutrients from food are absorbed in the small intestine.
4. Assimilation: how our bodies use nutrients
5. Egestion: it gets rid of undigested food through egestion
.
The Importance of Enzymes
Amylase—Digests starch
Protease—Digests proteins
Lipase—Digests fats
Respiration
Respiration is the process of breaking down food and getting energy.
Aerobic Respiration
It takes place in the presence of oxygen.
Glucose + Oxygen → Carbon dioxide + Water + Energy
And produces more energy.
Anaerobic Respiration
Takes place without oxygen.
Occurs in muscles during heavy exercise.
Produces less energy and lactic acid.
Respiratory Organs
Humans – Lungs
Fish – Gills
Insects – Trachea
Plants – Stomata, lenticels
Transportation
Transportation is the movement of food, water, gases, and waste around the body.
Transportation in Plants
Xylem
It carries water and minerals from roots to leaves
Only upward movement
Phloem
It carries prepared food from leaves to other parts
Moves in both directions
Transportation in Humans
Blood
The blood carries oxygen, food, hormones, and waste materials.
RBCs – Carry oxygen
WBCs – Fight disease
Platelets – Help in clotting
Plasma – Liquid part of blood
Heart
The heart pumps blood throughout the body.
Humans have a 4-chambered heart.
Excretion
Excretion is the removal of harmful waste products from the body.
Examples of wastes:
Carbon dioxide
Urea
Excess water
Salts
Human Excretory System
Main organs:
Kidneys
Ureters
Urinary bladder
Urethra
Kidney Function
Kidneys filter blood and form urine.
Urine Formation Steps
1. Filtration
2. Reabsorption
3. Secretion
Excretion in Plants
Plants remove waste through:
Stomata
Lenticels
Roots
Shedding old leaves
Important Diagrams
Digestive System
Mouth → Food Pipe → Stomach → Small
Intestine → Large Intestine → Rectum → Anus
Respiratory System
Nose → Trachea → Bronchi → Lungs → Alveoli
Human Heart
Right Atrium → Right Ventricle → Lungs
Left Atrium → Left Ventricle → Body
Nephron
Bowman’s Capsule → Tubule → Collecting Duct
MCQs
Q1. Which tissue transports water in plants?
a) Phloem
b) Xylem
c) Epidermis
d) Cambium
Answer: b) Xylem
Q2. Which gas is used in aerobic respiration?
a) Nitrogen
b) Carbon dioxide
c) Oxygen
d) Hydrogen
Answer: c) Oxygen
Q3. Which organ removes urea from blood?
a) Heart
b) Liver
c) Kidney
d) Lung
Answer: c) Kidney
Q4. Which blood cells carry oxygen?
a) WBC
b) RBC
c) Platelets
d) Plasma
Answer: b) RBC
Q5. Food is absorbed mainly in:
a) Mouth
b) Stomach
c) Small intestine
d) Large intestine
Answer: c) Small intestine
Short-Answer Questions
Q1. Difference between aerobic and anaerobic respiration?
Aerobic respiration uses oxygen and produces more energy. Anaerobic respiration happens without oxygen and produces less energy.
Q2. What does xylem do?
Xylem transports minerals and water from roots to leaves.
Q3. What is the importance of nutrition?
Nutrition gives you energy, helps you grow, and fixes tissues.
Q4. What is a nephron?
The nephron is the part of the kidney that filters blood.
Q5. What is the phloem?
Phloem transports nutrients from the leaves to other parts of the plant.
FAQs
Q1. What is the distinction between excretion and ingestion?
Metabolic waste products like urea are eliminated by excretion. Undigested food is eliminated by digestion.
Q2. Are plants able to breathe at night?
Yes, plants breathe both day and night.
Q3. Why is the heart important?
The heart distributes blood to all body parts.
Q4. Why are the kidneys important?
It can filter kidneysa blood and remove waste things
Final Thoughts
Life processes are necessary for survival. Nutrition gives food, breathing lets out energy, moving things around, and excretion gets rid of waste. It works together to keep living things alive.
For the Class 10 tests, pay attention to diagrams, definitions, differences, and multiple-choice questions. To get good grades, you need to practice a lot.
Quick Points for Review
Nutrition = Food intake
Respiration is energy release.
Xylem = Water transport
Phloem = Food transport
Kidney = Waste removal
Heart = Blood pumping