Chapter 11: Photosynthesis Flashcards

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1
Q

during the light-independent reaction of photosynthesis, carbon dioxide is converted into organic substances. Describe how. [6 marks]

A
  1. carbon dioxide combines with ribulose bisphophate/ RuBP
  2. produces two glycerate 3 phosphate
  3. GP reduced to triose phosphate
  4. using reduced NADP
  5. using energy from ATP
  6. triose phosphate converted to glucose
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2
Q

Crops use light energy to produce photosynthetic products. Describe how crop plants use light energy during the light-dependent reaction. [5 marks]

A
  1. excites electrons / electrons removed from chlorophyll
  2. electrons move along carriers/electron transfer chain releasing energy
  3. energy used to join ADP + Pi to form ATP
  4. photolysis of water produces protons, electrons and oxygen
  5. NADP reduced by electrons / electrons and protons / hydrogen
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3
Q

During photosynthesis, oil-palm trees convert carbon dioxide into organic substances. Describe how. [6 marks]

A
  1. carbon dioxide combines with ribulose bisphosphate
  2. produces two molecules of glycerate 3 phosphate
  3. reduced to triose phosphate
  4. using reduced NADP
  5. using energy from ATP
  6. triose phosphate converted to other organic substances
  7. in light independent reaction
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4
Q

describe the light-independent reaction of photosynthesis. [6 marks]

A
  1. carbon dioxide combines with ribulose bisphosphate
  2. produces two glycerate 3 phosphate using rubisco
  3. GP reduced to triose phosphate
  4. using reduced NADP
  5. using energy from ATP
  6. triose phosphate converted to glucose
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5
Q

Energy enters most ecosystems through the light-dependent reaction of photosynthesis. Describe what happens during the light-dependent reaction. [5 marks]

A
  1. chlorophyll absorbs light energy
  2. excites electrons / electrons removed
  3. electrons move along carriers / electron transport chain releasing energy
  4. energy used to join ADP + Pi to form ATP
  5. Photolysis of water produces protons, electrons and oxygen
  6. NADP reduced by electrons / electrons and protons / hydrogen
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6
Q

In the light-dependent reaction of photosynthesis, light energy generates ATP. Describe how. [5 marks]

A
  1. light energy excites / raises energy level of electrons in chlorophyll
  2. electrons pass down electron transfer chain
  3. electrons reduce carriers / passage involves redox reactions
  4. electron transfer chain / role of chain associated with chloroplast membranes
  5. energy released / carriers at decreasing energy levels
  6. ATP generated from ADP and phosphate
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7
Q

The concentrations of carbon dioxide in the air at different heights above ground in a forest changes over a period of 24 hours. Use your knowledge of photosynthesis to describe these changes and explain why they occur. [5 marks]

A
  1. high concentration of carbon dioxide linked with night
  2. no photosynthesis in dark
  3. plants respire
  4. In light net uptake of carbon dioxide by plants / plants use more carbon dioxide than they produce / rate of photosynthesis greater than rate of respiration
  5. decrease in carbon dioxide concentration with height
  6. at ground level fewer leaves / less photosynthesizing tissue / more animals / less light
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8
Q

In the light-independent reaction of photosynthesis, the carbon in carbon dioxide becomes carbon in triose phosphate. Describe how. [5 marks]

A
  1. carbon dioxide combines with ribulose bisphosphate
  2. to produce two molecules of glycerate 3 phosphate
  3. reduced to triose phosphate
  4. requires reduced NADP
  5. energy from ATP
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