Photosynthesis Notes

1
Photosynthesis Notes

• Biology Unit 05 Lesson 01

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Chemosynthesis

• Chemosynthesis uses energy released from chemical
  reactions to produce food for organisms.
• Organisms that carry out chemosynthesis are
  microbes (bacteria) that live far from the Sun,
  such as deep on the ocean floor.

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Which Organisms Carry Out Photosynthesis?

• Autotrophs such as plants and some protists

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Photosynthesis

• Photosynthesis is the cellular process in which
  autotrophs capture light energy and convert it to
  chemical energy (glucose) using carbon dioxide
  and water.

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Equation for Photosynthesis

• 6CO2 6H2O Light Energy ? C6H12O6 6O2
• Carbon Dioxide Water Light Energy ? Glucose
  (sugar) Oxygen

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Reactants Productsof Photosynthesis
REACTANTS PRODUCTS
Carbon Dioxide Glucose (sugar)
Water Oxygen
Light Energy
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Where Does Photosynthesis Occur?

• Chloroplasts
• Contain chlorophyll in plant cells or autotrophs

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Light Dependent Reaction

• Occurs in the thylakoid
• Water is absorbed through roots.
• Sunlight enters the chloroplast, causing H2O
  molecules to split.
• O2 leaves as a waste product through the stomata.
• NADP picks up the H ions (becoming NADPH) and
  moves them to the stroma for the light
  independent reaction (Calvin cycle).

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Light Independent Reaction Calvin Cycle

• Carbon dioxide from the atmosphere enters
• H breaks off from NADPH
• NADP returns to the Light Dependent Reaction
• Carbon dioxide becomes fixed with the H
  producing the glucose molecule C6H12O6.

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Reactants Productsof Photosynthesis
REACTIONS PRODUCTS