Grade 10 Life Processes Life processes Continuously perform the functions of maintenance in living organisms Examples- digestion, respiration, circulation etc. Nutrition Process of obtaining nutrients from the e nvironmentTwo types- autotrophic and heterotrophic 1. Autotrophic nutrition Synthesis of food by photosynthesis Photosynthesis equation- Sunlight 2 2 6 12 6 2 chlorophyll 6CO + 6H O C H O + 6O Two phases of photosynthesis- light and dark reactions Light reaction- light energy absorbed, H 2 O split into H 2 and O 2 , ATP and NADPH 2 synthesizedDark reaction- CO 2 reduced to carbohydrates2. Heterotrophic nutrition Generally derive energy from plants and animal sourcesMainly of three types —holozoic, parasitic, and saprophytic Digestion- mechanical and chemical reduction of ingested nutrientsHuman digestive system- consists of the long alimentary canalAlimentary canal includes- mouth, pharynx, oesophagus, stomach, sm all intestine, and large intestineAccessory organs- pancreas, liver Respiration Enzymatically- controlled energy released from the breakdown of organic substancesTwo types- aerobic and anaerobic 1. Aerobic respiration Oxidation of food materials with the help of oxygen Yields 36 ATP
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Continuously perform the functions of maintenance in living organismsExamples- digestion, respiration, circulation etc.
Nutrition
Process of obtaining nutrients from the environment
Two types- autotrophic and heterotrophic
1. Autotrophic nutrition
Synthesis of food by photosynthesis Photosynthesis equation- Sunlight
2 2 6 12 6 2chlorophyll6CO + 6H O C H O + 6O
Two phases of photosynthesis- light and dark reactions Light reaction- light energy absorbed, H2O split into H2 and O2, ATP and
NADPH2 synthesized
Dark reaction- CO2 reduced to carbohydrates
2. Heterotrophic nutrition
Generally derive energy from plants and animal sources Mainly of three types — holozoic, parasitic, and saprophytic
Digestion- mechanical and chemical reduction of ingested nutrients Human digestive system- consists of the long alimentary canal Alimentary canal includes- mouth, pharynx, oesophagus, stomach, small
intestine, and large intestine
Accessory organs- pancreas, liver
Respiration
Enzymatically- controlled energy released from the breakdown of organic
substances Two types- aerobic and anaerobic
1. Aerobic respiration
Oxidation of food materials with the help of oxygen