NCERT- Science- class 7- chapter 1 Notes - CBSE/Schools

CBSE/Schools: NCERT- Science- class 7- chapter 1 Notes - CBSE/Schools

The document NCERT- Science- class 7- chapter 1 Notes - CBSE/Schools is a part of CBSE/Schools category.
All you need of CBSE/Schools at this link: CBSE/Schools

Summary:-

  • there are two types of main nutrition Autotrophic and Heterotrophic nutrition.
  • Autotrophic nutrition-
  1.  auto means self and trophos means nourishment.
  2. it is done by mainly plants.
  3. it the mode of nutrition in which organisms make food for themselves from simpler substances.
  4. such organisms are called autotrophs.
  • Heterotrophic nutrition:-
  1. heteros means other and trophos means nourishment.
  2. it is done by animals and other organisms.
  3. it is mode of nutrition in which organisms depend on other plant or animals for their food.
  4. such organisms are called as heterotrophs.
  • Cell-
  • it is a universal object, each thing in universe in made of cell.
  • it is surrounded by cell membrane (like its bodyguard), inside cell membrane, cytoplasm is present (like its mussels) and inside cytoplasm, nucleus is present (like its brain).
  • millions of cells forms a tissue, millions of tissues forms mussels, thousands of muscle forms a organs and several organ forms a body.
  • Photosynthesis-
  1. it the process by which autotrophs or plants prepare their food from simpler substances like carbon dioxide, water, sunlight in the presence of green color pigment known as chlorophyll.
  2. chlorophyll traps sunlight (uses as a fuel to cook food) and synthesise or prepare food from carbon dioxide and water.
  3. glucose (carbohydrates) and oxygen are the result of photosynthesis.
  4. chemical equation:- carbon dioxide + water + sunlight + chlorophyll→ oxygen + carbohydrate
  • saprotrophs-
  1.  saprotrophic mode of nutrition is the mode of nutrition in which organisms feed on dead and decaying organic matter, organisms following such mode of nutrition are called saprotrophs.
  2. they release digestive juices on the dead and decaying matter and make it in solution form and then absorb that solution.
  3. example:- fungi and mushroom.
  • symbions-
  1. symbiosis is the mode of nutrition in which two organisms depend on each other for shelter, water and minerals. this is called a symbiotic relationship, such organisms are called symbions.
  2. example- rhizobium bacteria and leguminous plant .
  • lichens-
  1. lichens is another type of symbiotic relationship.
  2. in lichens a chlorophyll containing partner, alga and fungi live together, fungi gives shelter, water and minerals; in return alga prepares and provides food to fungi prepared by photosynthesis.
  • insectivorous plants-
  1. some develop into insectivorous plants as they grow into nitrogen deficient soil.
  2. in order to fulfill their need of nitrogen to make protein they trap insects and eat them in addition to photosynthesis.
  3. example:- pitcher plant, venus flytrap, sundew etc.
The document NCERT- Science- class 7- chapter 1 Notes - CBSE/Schools is a part of CBSE/Schools category.
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