This chapter discusses vital life processes that are essential for maintaining life in organisms. It explains the significance of these processes in ensuring survival and growth.
Life Processes - Quick Look Revision Guide
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Key Points
Define life processes.
Life processes are the basic functions performed by living organisms to maintain life, such as nutrition, respiration, transportation, and excretion.
Autotrophic nutrition in plants.
Plants prepare their own food using sunlight, carbon dioxide, and water through photosynthesis. Example: Green leaves making glucose.
Heterotrophic nutrition types.
Organisms that depend on others for food. Types include saprophytic, parasitic, and holozoic. Example: Humans eating food.
Photosynthesis equation.
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2. It occurs in chloroplasts containing chlorophyll.
Human digestive system parts.
Includes mouth, esophagus, stomach, small intestine, large intestine, and anus. Each part has a specific function in digestion.
Role of enzymes in digestion.
Enzymes break down complex food into simpler substances. Example: Amylase breaks starch into sugars.
Aerobic vs anaerobic respiration.
Aerobic uses oxygen to produce more energy (36 ATP), while anaerobic doesn't use oxygen and produces less energy (2 ATP).
Human respiratory system.
Includes nostrils, trachea, lungs, and alveoli. Alveoli increase surface area for gas exchange.
Double circulation in humans.
Blood passes through the heart twice in one complete cycle: pulmonary and systemic circulation.
Components of blood.
Plasma, RBCs, WBCs, and platelets. RBCs carry oxygen, WBCs fight infections, platelets help in clotting.
Structure of human heart.
Four chambers: two atria and two ventricles. Valves prevent backflow of blood.
Transport in plants: xylem and phloem.
Xylem transports water and minerals upwards; phloem transports food in both directions.
Transpiration pull.
Water is pulled upwards due to evaporation from leaves. It helps in cooling and nutrient transport.
Human excretory system.
Includes kidneys, ureters, bladder, and urethra. Kidneys filter blood to remove waste as urine.
Nephron structure and function.
Nephron is the filtering unit of the kidney. It filters blood, reabsorbs useful substances, and excretes waste.
Excretion in plants.
Plants excrete waste through transpiration, shedding leaves, or storing in vacuoles and bark.
Importance of hemoglobin.
Hemoglobin in RBCs binds with oxygen to transport it to body tissues. Deficiency causes anemia.
Role of bile in digestion.
Bile emulsifies fats, breaking them into smaller droplets for easier digestion by enzymes.
Adaptations in alveoli for gas exchange.
Thin walls, large surface area, and moist lining facilitate efficient oxygen and carbon dioxide exchange.
Difference between arteries and veins.
Arteries carry oxygenated blood away from the heart (except pulmonary artery); veins carry deoxygenated blood towards the heart (except pulmonary vein).
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