Class 10 / Science
Class 10 Science Life Processes Notes
Notes on nutrition, respiration, transportation, and excretion in plants and animals.
Topic introduction
Life processes are the basic activities that keep living organisms alive. In Class 10 Science, this chapter connects plant nutrition, human digestion, respiration, transportation, and excretion into one clear idea: every living body needs materials, energy, transport, and waste removal.
Key points
- Life processes include nutrition, respiration, transportation, and excretion.
- Plants make food by photosynthesis using carbon dioxide, water, chlorophyll, and sunlight.
- Aerobic respiration releases more energy than anaerobic respiration.
- The human heart, blood vessels, and blood help transport materials in the body.
Definitions
Nutrition: The process by which an organism takes in food and uses it for energy, growth, and repair.
Photosynthesis: The process by which green plants prepare food using carbon dioxide, water, sunlight, and chlorophyll.
Respiration: The breakdown of food to release energy inside cells.
Transportation: The movement of useful materials and wastes from one part of the body to another.
Excretion: The removal of harmful metabolic wastes from the body.
Examples
- Green plants are autotrophs because they prepare their own food.
- Humans are heterotrophs because they depend on other organisms for food.
- Yeast can show anaerobic respiration and produce alcohol and carbon dioxide.
- Nephrons filter blood and help form urine in the kidneys.
Nutrition and respiration
Autotrophs make their own food, while heterotrophs depend on other organisms.
Respiration breaks down food to release energy for cellular activities.
Transport and excretion
Blood transports oxygen, nutrients, hormones, and wastes.
Kidneys remove nitrogenous wastes and help regulate water balance.
Common mistakes
- Writing respiration and breathing as the same process. Breathing is physical exchange of gases, while respiration releases energy in cells.
- Forgetting that plants also respire throughout the day and night.
- Mixing up xylem and phloem: xylem mainly transports water and minerals, while phloem transports food.
- Writing only organ names without explaining their function in long answers.
- Missing key terms such as chlorophyll, stomata, haemoglobin, nephron, and transpiration.
Quick practice
- Write the equation for photosynthesis.
- What is the role of stomata?
- Differentiate aerobic and anaerobic respiration.
- Name the functional unit of kidney.
Related practice
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