Chapter 4b4c Photosynthesis

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Chapter 4b-4c Photosynthesis Chemoautotrophy
JEOPARDY
With special hosts You !!! (and your friendly
teacher)
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The Board
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Wild Card 100

• Excluding the last few decades, Carbon dioxide
  (CO2) levels in Earths atmosphere have
  (decreased / increased) dramatically over
  millions of years.
• Answer- What is, DECREASED. Oxygen has increased
  due to plants. (In the last few decades, CO2 has
  increased due largely to human activities)
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Wild Card 200

• Using special adaptations, C4 plants avoid an
  important process that reduces rate of
  photosynthesis.
• Answer- What is photorespiration.
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Wild Card 300

• The size of Chemoautotrophs.
• Answer- What is, small (all are bacteria)
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Wild Card 400

• Chemoautotrophs reduce / ozydize the substances
  from which they gain energy.
• Answer- What is, oxydize.
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Wild Card 500

• The light intensity at which photosynthetic rate
  is highest.
• Answer- What is, at or just below the LSP (light
  saturation point)
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No light 100

• Type of producers present where there is no
  light.
• Answer- What is, Chemoautotrophs
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No light 200

• CAM plants do this at night.
• Answer- What is, take in CO2 thru open stomata,
  and do Carbon fixation
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No Light C. 300

• C3 plants release this at night.
• Answer- What is, CO2
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No light 400

• Molecules from light reactions that do not become
  available to either C3 or C4 plants at night.
• Answer- What are, ATP and NADPH
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No Light 500

• 4 examples of situations when light is a limiting
  factor of photosynthesis.
• Answer- What are, 1) Night time, 2) the ocean
  below a certain depth, 3) underground (on land),
  4) In a forest understory, below larger plants
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CO2 (CO2 Concentration) 100

• (At Night Take in CO2 , or release CO2) a) C3
  plants b) C4 plants c) CAM plants
• Answer- What is, a) C3 release CO2 b) C4 release
  CO2, c) CAM plants take in CO2
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CO2 200

• Photoautotrophs can do this with Carbon.
  Heterotrophs can not.
• Answer- What is, Carbon fixation (take it as
  CO2 from the air, and use it to produce sugars
  and other products
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CO2 300

• If CO2 is low in the air, this happens to the
  rate of photosynthesis.
• Answer- What is, rate of photosynthesis will be
  lower
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CO2 500

• Effect of a CO2 that is too high in the air, on
  photosynthetic rate by C3 plants.
• Answer- What is, photosynthetic rate reaches a
  maximum possible, then additional increases in
  CO2 do not produce further increases in
  photosynthesis. (However, the plants are not hurt
  by it). No difference between types of plants.
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CO2 400

• Photorespiration begins when this happens.
• Answer- What is, when O2 (and not CO2) combines
  with the enzyme rubisco ?
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Light intensity 100

• Too much light causes this to plants chlorophyll
  and other important molecules, and therefore to
  the rate of photosynthesis.
• Answer- What is, to get damaged, lowering the
  rate of photosynthesis ?
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Light intensity 200

•  The name of the undesirable process that occurs
  when too much light is absorbed by plants.
• Answer- What is, photoinhibition ?
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Light intensity 400

• The amount of light that nitrifying bacteria
  prefer (they dont operate otherwise)
• Answer- What is, no light (they live below the
  surface of the ground)
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Light intensity 500

• CAM plants live in places with LOTS of light /
  Little light (Choose)
• Answer- What is, LOTS of light (largely in
  deserts and very arid habitats)
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Light intensity 300

• A plant has enough light but not enough water.
  Its photosynthetic rate will be . (why)
• Answer- What is, lower than with sufficient water
  (Because it will tend to close its stomata to
  minimize water loss)
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O2 (O2 concentration) 300

• The adaptation of C4 plants to deal with high
  concentrations of O2 in air.
• Answer- What is, 2 systems of CO2 fixation
  (instead of one), the first with a enzyme
  different than rubisco
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O2 300

• The enzyme rubisco has problems with high O2.
  The problem is
• Answer- What is, Rubisco attaches Oxygen instead
  of Carbon, allowing photorespiration to occur
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O2 500

• Effect of low oxygen concentration in air, for
  plants.
• Answer- What is, They will love it, and will have
  the highest rate of photosynthesis
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O2 200

• (Choose one C3 plant / C4 plant). Would have
  the most difficulty in high O2.
• Answer- What is, C3 plant (it will go into
  photorespiration). C4 plants have adaptation to
  fix Carbon regardless of O2
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O2 100

• Effect of normal concentration of Oxygen in air,
  on rate of photosynthesis by C3 plants.
• Answer- What is, it keeps the rate of
  photosynthesis down (by about 50 It would be
  higher at lower than normal atmospheric O2 .
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Wild Card 300

• Mode of E acquisition of symbiotic bacteria
  associated with hydrothermal vents worms ?
• Answer- What is, Chemoautotrophs?
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