Chapter 5: Life Processes

VIGYAN

Chapter 5: Life Processes Class X Science Key Points Life Processes: The processes essential for growth, repair, and maintenance of the body. The essential life processes are nutrition, respiration, transportation, and excretion. 1. Nutrition Steps: Ingestion, digestion, absorption, assimilation, and egestion. Photosynthesis: The process by which green plants make their own food. Equation: \( 6CO_2 + 12H_2O \xrightarrow{\text{Chlorophyll, Sunlight}} C_6H_{12}O_6 + 6O_2 + 6H_2O \) Steps: Absorption of light energy by chlorophyll. Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen. Reduction of carbon dioxide to carbohydrates. Heterotrophic Nutrition: Amoeba: Uses pseudopodia to engulf food (Holozoic nutrition). Digestion occurs in the food vacuole. Human Beings: Digestion takes place in the alimentary canal. 2. Respiration Aerobic vs Anaerobic: Aerobic uses oxygen (mitochondria); Anaerobic occurs without oxygen (yeast/muscle cells)…

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