Introduction to Photosynthesis

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Introduction to Photosynthesis
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Objectives
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Overview

• Plants convert the energy of sunlight into the
  energy of chemical bonds of carbohydrates

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Importance of Photosynthesis
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But thats not all..
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But wait, theres more..
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History

• Jan Van Helmont
• Found the mass of a pot of soil and a seedling.
  Watered the seedling for five years. Found the
  mass again
• Concluded that the increase in mass came from
  water

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History

• Joseph Priestly
• Found that a candle goes out when placed in a
  jar. However, the candle keeps burning if a sprig
  of mint is also placed in the jar.
• Concluded that plants produce Oxygen

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History

• Jan Ingenhousz
• Showed that Priestleys experiment only works in
  the light.
• Concludes that light is necessary for plants to
  produce oxygen

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History

• Magic School Bus class

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CO2H20 C(H2O)O2

• Chemical basis of photosynthesis

Light
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6CO26H20 C6H12O66O2

• Balanced Equation

Light
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CO2H20 C(H2O) O2
Sun
Entropy
Photosynthesis
Respiration
The BIG Picture
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Leaf Structure p.655
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Leaf structure
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Requirements for Photosynthesis
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Light

• Mostly violet, blue and red wavelengths from the
  visible spectrum

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Pigments
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Energy Storing Compounds

• Energy trapped by molecules can be used to lift
  electrons to a higher energy level.
• From that higher energy level the electrons can
  fall down to their original energy level and do
  work along the way.
• Example a solar cell that powers a calculator

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Or

• The high-energy electrons can be bound to an
  electron carrier.
• Nicotinamide Adenine Dinucleotide Phosphate
• NADP accepts a pair of high energy electrons and
  a Hydrogen ion to become NADPH

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And of Course

• ATP Adenosine Triphosphate
• Energy storing compound used by every living cell
• Provides the energy for almost all cellular
  functions

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Function of ATP
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Overview of Photosynthesis

• Light reactions
• Dark reactions Calvin Cycle

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Light Reactions
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Calvin Cycle

• Products from the light reactions and CO2 from
  the atmosphere are used to produce carbohydrates

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Objectives

1. Discuss energy flow through living systems
2. Identify the parts of a leaf
3. Outline the process of photosynthesis

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Homework

• See planner.

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Have a nice day