Class 10 Biology – Chapter 1: Life Processes –
Detailed Notes
Introduction to Life Processes
All living organisms perform certain biological functions to maintain and sustain life. Life processes are
activities that keep the organism alive. Examples: Nutrition, respiration, transportation, excretion, etc.
Characteristics of Living Beings
Living beings show the following traits: - Nutrition: Intake of food for energy. - Respiration: Release of
energy by breaking down food. - Transportation: Movement of substances like nutrients and gases. -
Excretion: Removal of waste products. - Growth: Increase in size and mass. - Reproduction: Production
of offspring. - Responsiveness: Reacting to stimuli. - Movement: Locomotion or internal movement
(plants show internal movement only).
Nutrition
The process of obtaining and utilizing food by organisms for energy and growth. Types of Nutrition: 1.
Autotrophic Nutrition: Performed by plants, prepares food through photosynthesis. 2. Heterotrophic
Nutrition: Performed by animals, obtaining food from others.
Respiration
Process of breaking down glucose to release energy in the form of ATP. Types: - Aerobic: With oxygen,
complete breakdown of glucose, more energy. - Anaerobic: Without oxygen, partial breakdown of
glucose, less energy.
Transportation
Transport of nutrients, gases, and waste products in the body. Plants: Xylem and Phloem transport.
Humans: Circulatory system with heart, blood, arteries, veins, and capillaries.
Excretion
The process of removing metabolic waste. Plants: Excrete through stomata, resins, and gums.
Humans: Excretory system includes kidneys, ureters, bladder, and urethra.
Detailed Notes
Introduction to Life Processes
All living organisms perform certain biological functions to maintain and sustain life. Life processes are
activities that keep the organism alive. Examples: Nutrition, respiration, transportation, excretion, etc.
Characteristics of Living Beings
Living beings show the following traits: - Nutrition: Intake of food for energy. - Respiration: Release of
energy by breaking down food. - Transportation: Movement of substances like nutrients and gases. -
Excretion: Removal of waste products. - Growth: Increase in size and mass. - Reproduction: Production
of offspring. - Responsiveness: Reacting to stimuli. - Movement: Locomotion or internal movement
(plants show internal movement only).
Nutrition
The process of obtaining and utilizing food by organisms for energy and growth. Types of Nutrition: 1.
Autotrophic Nutrition: Performed by plants, prepares food through photosynthesis. 2. Heterotrophic
Nutrition: Performed by animals, obtaining food from others.
Respiration
Process of breaking down glucose to release energy in the form of ATP. Types: - Aerobic: With oxygen,
complete breakdown of glucose, more energy. - Anaerobic: Without oxygen, partial breakdown of
glucose, less energy.
Transportation
Transport of nutrients, gases, and waste products in the body. Plants: Xylem and Phloem transport.
Humans: Circulatory system with heart, blood, arteries, veins, and capillaries.
Excretion
The process of removing metabolic waste. Plants: Excrete through stomata, resins, and gums.
Humans: Excretory system includes kidneys, ureters, bladder, and urethra.
