Photosynthesis

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Photosynthesis
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Photosynthesis
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Which of the following is a product of
photosynthesis?

1. Water
2. Glucose
3. Carbon Dioxide
4. Sunlight

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In addition to sunlight, what are the other
reactants for the process of photosynthesis?

1. Water and oxygen
2. Water and glucose
3. Oxygen and carbon dioxide
4. Water and carbon dioxide

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Pigments of Photosynthesis

• Pigments are molecules that absorb specific
  wavelengths (energies) of light and reflect all
  others.
• Chlorophyll is the main pigment in charge of
  capturing the energy from sunlight.

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• Chlorophyll a absorbs .. light best.
• Chlorophyll b absorbs . light best.
• Why do plants look green?
• THEY RELFECT GREEN LIGHT!!!

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Chloroplast Structure
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Chlorophyll is a pigment in the chloroplast that

1. stores and releases energy
2. absorbs sunlight
3. Carries high energy electrons
4. Makes glucose

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Chloroplasts do not contain which of the
following structures?

1. Mitochondria
2. Thylakoids
3. Stroma
4. Chlorophyll

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What is the process in which autotrophs trap the
energy from the sun and store this energy in
molecules such as glucose.

1. Predation
2. Metabolism
3. Cell Respiration
4. Photosynthesis

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1.Write down 3 observations of the diagram
below. 2. Share with a partner. 3. Share with the
class! Discuss!!
H2O
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Remember ATP??

• ATP
• Adenosine triphosphate
• 3 phosphate groups
• ADP
• Adenosine diphosphate
• 2 phosphate groups
• Compound that cells use to store and release
  energy

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Chemical Energy and ATP
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Electron Carrier Molecule

• Electron Carrier Molecules
• Compound that can accept a pair of high energy
  electrons and transfer them, along with most of
  their energy to another molecule
• One way the sunlight can be trapped in a chemical
  form and use it to build glucose for the plant
  cell
• Example
• NADP accepts and holds 2 high energy electrons
  along with a hydrogen ion (H)
• When NADP accepts 2 electrons and a H it
  becomes NADPH

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Photosynthesis Step 1 Light-Dependent Reaction
IN Sunlight Water ADP NADP OUT Oxygen ATP NADPH

• Takes place in Thylakoids.
• Chlorophyll absorbs light energy from the sun.
• Water is then split into hydrogen (H) and oxygen
  (O).
• The oxygen is released to the atmosphere.
• Produces NADPH and ATP for the Calvin Cycle (step
  2)!

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Photosynthesis Step 2 Light-Independent
Reaction
IN Carbon Dioxide ATP NADPH OUT Glucose
NADP ADP

• Takes place in Stroma.
• Also called the Calvin Cycle or Dark Reactions.
• CO2 (carbon dioxide) combines with hydrogen (H)
  to form C6H12O6 (glucose).
• The NADPH made in the light-dependent reactions
  provides the Hydrogen for the glucose
• The ATP made in light-dependent reactions
  provides the energy for the Calvin Cycle to occur.

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What affects the rate of photosynthesis?

• Amount of
• - sunlight
• - CO2
• - H2O
• - temperature
• All the reactions of photosynthesis are
  controlled by enzymes. Temperatures above or
  below the optimum temperature will slow down the
  chemical reactions.

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GET YOUR CLICKERS!
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Energy from the sun is collected during the

1. Light-independent reactions
2. Light-dependent reactions
3. Thylakoid reactions
4. Krebs Cycle

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Glucose is created during this step of
photosynthesis.

1. Light-independent reaction
2. Light-dependent reaction
3. Thylakoid reactions
4. Krebs Cycle

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Which of the following would not directly impact
the growth of a plant?

1. Spectrum of light
2. Concentration of oxygen
3. Concentration of carbon dioxide
4. Availability of water
5. Temperature

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Which of the following is NOT produced in the
light-dependent reactions?

1. NADPH
2. Sugars
3. Hydrogen Ions
4. ATP