Photosynthesis and Cellular Respiration

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Questions and Answers

What is the primary energy source for all organisms on earth?

  • Sunlight (correct)
  • Glucose
  • Oxygen
  • ATP

What is the end result of photosynthesis?

  • The release of ATP
  • The breakdown of glucose into simpler molecules
  • The production of oxygen only
  • The storage of energy in glucose (correct)

What is the process of breaking down glucose into simpler molecules?

  • Photosynthesis
  • Cellular respiration (correct)
  • Fermentation
  • Glycolysis

What is the energy currency for cells?

<p>ATP (A)</p> Signup and view all the answers

What is the relationship between photosynthesis and cellular respiration?

<p>They are opposite processes (C)</p> Signup and view all the answers

What is required for the continuous functioning of photosynthesis and cellular respiration?

<p>A constant input of sun energy (C)</p> Signup and view all the answers

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Study Notes

Energy and Cells

  • The sun is the principal source of energy for all organisms on earth.
  • This light energy is absorbed by photosynthetic organisms, such as plants and algae.

Photosynthesis

  • Photosynthesis converts carbon dioxide (CO2) to glucose and oxygen using light energy.
  • The energy from the sun is stored in glucose, a simple carbohydrate.
  • Glucose is used as food by humans and other organisms.

Cellular Respiration

  • Cellular respiration is the process of breaking down glucose into simpler molecules.
  • This process releases energy from glucose and stores it in adenosine triphosphate (ATP).
  • ATP is the major energy carrier for cells.

Relationship Between Photosynthesis and Cellular Respiration

  • The molecules produced in photosynthesis are used in cellular respiration.
  • The molecules produced in cellular respiration are used in photosynthesis.
  • The energy stored in glucose during photosynthesis is released as ATP during cellular respiration.
  • A constant input of sun energy is needed to maintain these processes.

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