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Option 3 : I and III

  • Photosynthesis fulfils carbon and energy requirements of the autotrophic organisms.
  • Photosynthesis is a process through which plants and other organisms convert light energy into chemical energy to obtain food.
  • Autotrophic organisms are those which are capable of synthesizing their own food from inorganic substances with the help of chemical energy or light.
  • Certain bacteria, algae, and green plants are autotrophs.
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