life processes #aanchal

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  1. 1. Life ProcessesThe word life processes means the processes take place in the human body which are needed for the existence of life on Earth. For example Digestion, respiration, excretion, reproduction, etc.
  2. 2. Nutrition Autotrophic nutrition Heterotrophic nutrition
  3. 3. Autotrophic Nutrition Synthesis of food by photosynthesis. Photosynthesis equation- 6CO2+6H2O (sunlight and chlorophyll) C6H12O6 + 6O2. Two phases of photosynthesis- light and dark reactions. Light reaction- light energy absorbed, H2O split into H2 and O2,
  4. 4. Heterotrophic NutritionGenerally derive energy from plants and animal sources. Mainly of three types :- 1). Holozoic (Obtaining nourishment as animals doby ingesting complex organic matter), 2). Parasitic (having the nature or habits of a parasite or leech), and 3). Saprophytic (feedingon dead or decaying organic matter) Digestion - mechanical and chemical reduction of ingested nutrients.
  5. 5. Photosynthesis The process of the synthesis of carbohydrates or food in presence of carbon dioxide and light is called photosynthesis. The ways:- 1). Absorption of light energy by chlorophyll. 2). Conversion of light energy to
  6. 6. Stomata A minute epidermal pore in a leaf or stem through which gases and watervapor can pass. The opening and closing of stomata is controlled by guard cells. When the guard cells absorb water the stomata gets open and
  7. 7. Nutrition in Amoeba Amoeba takes in food using temporary finger like extensions of cell surface which fuse over food particle forming food vacuole . Inside the food vacuole, complex substances are broken down into simpler ones which then diffuse
  8. 8. Nutrition in Human Beings The nutrition in human beings takes place in the human alimentary canal. The food in taken in through mouth and mixed with the saliva and passed to oesophagus. Saliva contains salivary amylase that breaks down starch. The food then goes to the stomach where the
  9. 9. Respiration Respiration involves the exchange of gases and oxidation of food in the presence of air to release energy. Inhalation and exhalation of air occur due to change in air pressure in lungs.
  10. 10. Transportation in humans Blood is a fluid connective tissue that circulates through heart and blood vessels. Blood consists of plasma with RBC, WBC and platelets. Arteries transport blood from heart to the tissues. Blood pressure is the force that
  11. 11. Circulatory system in humans Human heart is a 4 chambered muscular pump located in our chest cavity. In humans the blood flows through 2 loops -Pulmonary and systemic circulation. The heartbeat is initiated and regulated by cardiac muscles.
  12. 12. Transportation in plants The transport system in plants works with the help of conducting tubes known as xylem and phloem. The rise of water and dissolved minerals in the xylem vessels against the force of gravity is known as
  13. 13. Excretion Biological process of eliminating metabolic waste substances is called excretion. Human excretory system consists of pair of kidney and ureter, a Urinary bladder and a urethra.
  14. 14. Structure of nephron Each kidney has numerous filtration units called Nephrons. These Nephrons consist of Glomerulus, Bowmans capsule, Renal artery, renal vein, collecting duct, etc. The blood is filtered in these units, then collected in the collecting tubule/duct. This collection is then passed to
  15. 15. Excretion in Plants The plants also give out some toxic wastes. Plants dont have any excretory system as human beings have. They throw this waste through many ways such as transpiration, throwing