Why photosynthesis

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Why photosynthesis?
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_______________________
3
___________________
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_____________________

• Green plants take atmospheric ____ and use it to
  make ____________________
• They do this for free!
• Burning of trees and green plants (deforestation)
  releases ________________________________________
  ____

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______________________

• Green plants take atmospheric ____ and use it to
  make ____________________
• They do this for free!
• Burning of trees and green plants (deforestation)
  releases ________________________________________
  ____
• An understanding of _____________________________
  ____________________

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Photosynthesis

• Chapter 5, Section 3
• Chapter 6

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Photosynthesis

• Definition

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Who/What carries out photosynthesis?
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___________________

• Any organisms that obtain their energy from
  inorganic sources
• Typically _______________ organisms
• Green plants, cyanobacteria, and some bacteria
  are ___________________
• ______________
• Organisms that can ______________________________
  ____________________

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Primary Producers

• The bottom of every food chain!

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Primary Producers

• The bottom of every food chain!

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Kingdom ____________

• Green algae and land plants
• Plants characterized by
• Chlorophyll a and chlorophyll b
• Has _______ and accessory __________
• Have cell walls made of cellulose
• Starch used as a storage carbohydrate
• Plants important because _____________

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Plant Structures for Photosynthesis

• _______________
• Cuticle
• ____________ (plural _____________)
• ______________________
• Thylakoid stacks
• Stroma
• Chlorophyll

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Epidermis and Cuticle

• Epidermis
• Protects the other layers of leaf tissue
• Cuticle
• The top-most layer of the epidermis
• Protects the leave against dehydration

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Stoma
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Stoma

• Plural Stomata
• Numerous small __________________________________
  ______________
• Found on the undersides of leaves and on some
  stems
• Allow for _______________________________________
  ________________
• Close when environment is dry

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From Chapter 17 in your books
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Chloroplasts - REVIEW

• Use energy from the sun to make ATP and other
  energy-carrying molecules
• ATP and other molecules are used to make glucose
• Found within cells of green plants

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Chloroplasts

• The organelles responsible for photosynthesis
• Leaves have the highest concentration of
  chloroplasts than any other part of the plant
• Structures within chloroplasts
• Thylakoid
• Stroma
• Chlorophyll

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Thylakoid

• A ______________ where light energy is captured
  and stored as chemical energy
• Located within __________________

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__________________

• _____________ the stacks of thylakoid disks and
  the external membrane of the chloroplast
• Located _______________________

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_________________

• The _____________ that helps capture the energy
  in sunlight to provide the power for
  photosynthesis
• The most prominent energy-capturing pigment in
  the membrane of thylakoids

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_________________

• Absorb photons of light which act as waves
• The colors we see are ___________________________
  ____________
• When we see a color, we are seeing
  ________________________________________________
  _____

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Other plant pigments

• _________________

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Other plant pigments

• _______________

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Other plant pigments

• ______________

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Photosynthesis

• A metabolic pathway

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Photosynthesis

• Two-step process ________________________________
  __________________
• ATP _______________________
• Plants use ATP to make the following reaction
  go

____________ ----------gt ____________
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Photosynthesis

• ATP helps to make the carbon-carbon bonds of
  glucose molecules

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Why do plants make both ATP and glucose?

• Both molecules are good for energywhy need two?

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ATP vs Glucose

• ATP

• Glucose

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ATP vs. Glucose

• ATP
• Energy comes from _______________________________
  ___________________

• Glucose
• Energy comes from _______________________________
  _______________________

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ATP vs. Glucose

• ATP
• ________________
• __________________________________

• Glucose
• ____________________________________
• ________________________________________________
  ____

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Photosynthesis

• Carried out by MANY small reactions
• Enzymes (chemical catalysts) are involved in many
  of these small reactions
• These reactions can be grouped into two larger
  sets of metabolic pathways
• ____________________
• ___________________________________

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Light Reactions

• This part of the photosynthetic metabolic pathway
  takes place _____________________________________
  ____
• _______ provides energy for the reactions
• Products here are _________________, which are
  ________________ molecules
• ______________________ important here

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Electron Transport Chain

• ______________________________
• Produces a __________, or areas of ____
  concentration and _______ concentration
• The easiest form of diffusion is from areas of
  high concentration to low

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Electron Transport Chain

• What items are being diffused?
• ___________________, which gain energy each time
  they are transferred
• When ____________ are separated from ______, we
  also get free-floating __________________________
  _______________

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Electron Transport Chain

• In photosynthesis, ______________________________
  _________________________________________________
  ____
• This ______ diffusion generates
  ______________________________________
• We have now accounted for both ______ AND
  ___________________________

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What about the rest of our equation?
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Think for a moment

• How many carbon atoms are in one molecule of
  carbon dioxide?

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Think a moment more

• How many carbon atoms are in one molecule of
  glucose?

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Carbon Fixation makes ________
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Carbon Fixation

• Occurs in the ________ and _________ of
  ________________________
• Uses _____ obtained from the atmosphere via
  _________________________
• Uses ____________________________________________
  ________________________________________________

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Carbon Fixation

• Specifically, ___________________________________
  _________________________________________________
  ____
• Cyclical reactions whose products include
  _______________________________
• __________________ will then be reused in the
  _______________________

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Photosynthesis Video

• http//www.youtube.com/watch?vhj_WKgnL6MI

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How do plants use glucose?

• Glucose is used in two ways
• To provide ______________________________________
  _____________________
• To provide ______________________________________
  _____________________________________________

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Glucose important for other organisms

• Plants and ______________________________________
  ________________________________________________
• We get glucose, an energy-providing molecule, by
  _________________________________________________
  _______
• Plants provide a ____________________

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How do plants and animals use glucose?