Photosynthesis and respiration
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Photosynthesis and Respiration. Metabolism. The total of all chemical reactions that take place in an organism. Most chemical reactions in an organism require enzymes. An enzyme is a protein that speeds up a chemical reaction . Photosynthesis.

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Photosynthesis and respiration

Photosynthesisand Respiration


Metabolism
Metabolism

The total of all chemical reactions that take place in an organism. Most chemical reactions in an organism require enzymes. An enzyme is a protein that speeds up a chemical reaction.


Photosynthesis
Photosynthesis

  • The process of converting light energy into chemical energy and storing that energy in the bonds of a sugar (glucose)

  • Producers – including plants, algae and some bacteria – are photosynthetic

  • Takes place in the chloroplast of a cell

  • carbon dioxide + water → glucose + oxygen

    CO2 + H2O → C6H12O6 + O2


Photosynthesis1
Photosynthesis

Almost all living things depend on sunlight!

carbon dioxide

oxygen

Sunlight

(energy)

glucose

water


Cellular respiration
Cellular Respiration

Respiration – the process in which chemical reactions break down food molecules into simpler substances and release stored energy. There are two types of cellular respiration – aerobic and anaerobic.


Aerobic respiration
Aerobic Respiration

  • Uses oxygen to release energy from glucose in order to generate a maximum of 38 ATP (adenosine triphosphate)

  • Occurs in both producers and consumers


Aerobic respiration1
Aerobic Respiration

glucose + oxygen → carbon dioxide + water

C6H12O6 + O2 → CO2 + H2O


Aerobic respiration2
Aerobic Respiration

oxygen

carbon dioxide

water

glucose

ATP

(energy)


Anaerobic respiration
Anaerobic Respiration

  • Does not use oxygen to release energy from glucose and only generates 2 ATP. This occurs when there is no oxygen or not enough oxygen for aerobic respiration.

  • Occurs in both producers and consumers.

  • Takes place in the cytoplasm.

  • Products include carbon dioxide, lactic acid and alcohol.



Photosynthesis vs cellular respiration1
Photosynthesis vs. Cellular Respiration

glucose + oxygen

ATP (energy)

sunlight

(energy)

carbon dioxide + water


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