Photosynthesis Overview Quiz
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Questions and Answers

What is the purpose of C4 plants incorporating CO2 into four-carbon compounds in mesophyll cells?

  • To minimize the cost of photorespiration (correct)
  • To enhance the process of glycolysis
  • To maximize the production of ATP
  • To promote the Calvin cycle

    • What enzyme catalyzes the reaction where CO2 reacts with phosphoenolpyruvate (PEP) to form oxaloacetate in C4 plants?

  • PEP synthase
  • NADPH reductase
  • Rubisco
  • PEP carboxylase (correct)

    • In C4 plants, how many times does carbon fixation occur according to the text?

  • Four times; in multiple cell types
  • Thrice; in mesophyll cells, bundle sheath cells, and stomata
  • Once, only in mesophyll cells
  • Twice; in mesophyll cells and in bundle sheath cells (correct)

    • What is the fate of malate in C4 plants after it is transported to the bundle sheath cells?

    <p>It undergoes decarboxylation to pyruvate and releases CO2</p> Signup and view all the answers

    What role does PEP carboxylase play in the C4 pathway?

    <p>Catalyzes the reaction of CO2 with PEP</p> Signup and view all the answers

    Why is the process called photorespiration in C4 plants?

    <p>Because it consumes oxygen and occurs in the light</p> Signup and view all the answers

    What is the primary role of the light-harvesting complex in photosynthesis?

    <p>To act as an antenna for the reaction center complex</p> Signup and view all the answers

    Which pigment absorbs light energy but transfers it to chlorophyll a?

    <p>Carotenoids</p> Signup and view all the answers

    Which photosystem contains the P700 reaction center?

    <p>Photosystem I</p> Signup and view all the answers

    What are the chemical products of the light-dependent reactions in photosynthesis?

    <p>NADPH and ATP</p> Signup and view all the answers

    What is the main function of photosynthetic pigments?

    <p>To trap light energy</p> Signup and view all the answers

    What is the role of chlorophyll in photosynthesis?

    <p>To provide the main photosynthetic pigment for capturing light energy</p> Signup and view all the answers

    What molecule is converted into ribulose bisphosphate (RuBP)?

    <p>G3P</p> Signup and view all the answers

    How many molecules of G3P are required to synthesize one molecule of glucose in the Calvin cycle?

    <p>12</p> Signup and view all the answers

    What happens to the remaining 10 molecules of G3P in the Calvin cycle?

    <p>They re-enter the Calvin cycle to produce RuBP</p> Signup and view all the answers

    Which enzyme catalyzes the reaction between CO2 and RuBP?

    <p>RuBP carboxylase-oxygenase (rubisco)</p> Signup and view all the answers

    What is the intermediate formed during the carbon fixation process called?

    <p>Phosphoglycerate (PGA)</p> Signup and view all the answers

    How many ATP molecules are required to produce 6 molecules of RuBP from the remaining 5 molecules of G3P?

    <p>3</p> Signup and view all the answers

    What is the first molecule formed during CO2 fixation in C3 plants?

    <p>3-phosphoglycerate</p> Signup and view all the answers

    What happens when the O2 concentration is higher than CO2 within the air spaces in the leaf?

    <p>Rubisco has higher affinity for O2</p> Signup and view all the answers

    What are the two primary photosynthetic adaptations that minimize photorespiration in plants during hot and dry conditions?

    <p>C4 pathway and CAM pathway</p> Signup and view all the answers

    How does C4 photosynthesis differ from C3 photosynthesis?

    <p>C4 plants use PEP to fix CO2 in mesophyll cells</p> Signup and view all the answers

    What happens during the reduction stage of the Calvin cycle?

    <p>Each molecule of 3-phosphoglycerate receives an additional phosphate group from ATP, becoming 1,3-bisphosphoglycerate</p> Signup and view all the answers

    What is the primary advantage of the CAM photosynthesis over C3 photosynthesis?

    <p>CAM plants are more efficient in arid environments</p> Signup and view all the answers

    What is the net result of the consumption of water in photosynthesis?

    <p>Water is consumed but not shown in the equation</p> Signup and view all the answers

    Where do chloroplasts contain 30-40 of?

    <p>Mesophyll cells</p> Signup and view all the answers

    What is the energy source for photosynthesis?

    <p>Light energy from the sun</p> Signup and view all the answers

    What is the definition of photosynthesis?

    <p>The conversion of light energy to chemical energy</p> Signup and view all the answers

    Where do O2 exits and CO2 enter?

    <p>Through the stomata in the leaf</p> Signup and view all the answers

    In which organisms does photosynthesis occur?

    <p>Plants, algae, and certain prokaryotes</p> Signup and view all the answers

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