Life Processes

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This demonstrates that photosynthesis requires light energy. In darkness, the plant uses up stored starch for respiration. In sunlight, photosynthesis occurs, producing glucose which is converted to s

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During exercise, muscle cells need more energy, requiring increased oxygen for aerobic respiration. Carbon dioxide production also increases. Faster breathing ensures adequate oxygen supply and effici

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Exhaled air contains more CO₂ (4%) than atmospheric air (0.03%). CO₂ reacts with lime water: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. The white precipitate (CaCO₃) forms faster with exhaled air due to higher CO₂

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Photosynthesis is the process by which green plants use sunlight, chlorophyll, carbon dioxide, and water to produce glucose and oxygen. 6CO₂ + 12H₂O + sunlight + chlorophyll → C₆H₁₂O₆ + 6O₂ + 6H₂O Th

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Dissolved oxygen in water is much lower than oxygen in air. Fish need faster breathing to extract sufficient oxygen from water through gills. The lower oxygen concentration requires higher water flow

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Guard cells swell when water enters them, making stomata open for gas exchange during photosynthesis. When guard cells lose water and shrink, stomata close to prevent water loss. This mechanism allows

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During intense exercise, oxygen supply becomes insufficient for aerobic respiration. Muscles switch to anaerobic respiration, producing lactic acid instead of CO₂ and water. Lactic acid accumulation i

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ATP (Adenosine Triphosphate) is the energy currency of cells. Energy from respiration converts ADP + Pi to ATP. When cells need energy, ATP breaks down to ADP + Pi, releasing 30.5 kJ/mol. This energy