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NCERT Solutions for Class 10th Science


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Chapter 6. Life Processes

Chapter Review





  • The processes which together perform for maintenance job are
    life processes.
  • Since these maintenance processes are needed to prevent damage
    and break-down, energy is needed for them.
  • Multicellular organisms have specialised tissue for different jobs like transportation, excreation and digestion etc. 
  • Outsidee raw materials are carbon dioxide and water that are used by organisms. 
  • The proccess by which organisms take their food and get energy for life process is known as nutrition. 
  • There are two types of nutrition: (i) Autotrophic nutrition (ii) Hetrotrophic nutrition. 
  • There are three types of Hertrotrophic nutrition: (i) Saprophytic nutrition (ii) Holozoic Nutrition (iii) Parasitic nutrition.
  • The nutrition in which organisms make their own food itself by the photosynthesis is called autotrophic nutrition. 
  • The nutrition in which organisms take their food by autotrophs or other sources is known as hetrotrophic nutrition. 
  • Holozoic nutrition: Animals take in solid food and breakdown or obsorb it inside the body. Amoeba and animals. 
  • Saprophytic nutrition: The nutrition in which organisms feed on dead and decaying materials. Like bacteria and Moosrooms etc. 
  • Paracytic nutrition: Some organisms live inside or outside of other organisms which is called host and derive ntrition from host. Like Tape worms, Lice in animals and cuscuta in plants. 
  • Amoeba move with the help of pseudopodia (extension of cell
  • Amoeba digests food in the food vacuole. 
  • The human digestive system comprises of alimentary canal and associated digestive glands.
  • The pancreas secretes pancreatic juice which contains enzymes like trypsin for digesting proteins and lipase for breaking down emulsified fats.
  • The inner lining of the small intestine has numerous finger-like projections called vill.
  • The process takes place in the presence of air (oxygen), it is called aerobic respiration.
  • The process takes place in the absence of air (oxygen), it is called anaerobic respiration.
  • The energy released during cellular respiration is immediately used
    to synthesise a molecule called ATP.
  • Blood is a fluid connective tissue.
  • The body temperature depends on the temperature in the environment.
  • The biood goes through the heart twice during each cycle in other vertebrates. This is known as double circulation.
  • The force that blood exerts against the wall of a vessel is called blood pressure.
  • The pressure of blood inside the artery during ventricular systole (contraction) is called systolic pressure.
  • The pressure in artery during ventricular diastole (relaxation) is called diastolic pressure.
  • The normal systolic pressure is about 120 mm of Hg and diastolic pressure is 80 mm of Hg.
  • Blood pressureis measured with an instrument called sphygmomanometer.
  • The smallest vessels have walls which are one-cell thick and are called capillaries.
  • Lymph is another type of fluid also involved in transportation. This is
    called lymph or tissue fluid.
  • Each kidney has large numbers of these filtration units called nephrons.


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