BIOL2151 Plant Physiology Test 2, 2024
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Questions and Answers

How does RuBisCO primarily behave when CO2 levels are low?

  • Acts as a carboxylase (correct)
  • Inhibits carbon fixation
  • Acts as an oxygenase
  • Increases O2 incorporation

    • How many photons are needed to produce one molecule of oxygen during photosynthesis?

  • 8 (correct)
  • 10
  • 6
  • 2

    • What is the final product of the Carboxylation phase in the Calvin-Benson Cycle?

  • RuBP
  • PGA (correct)
  • Glucose
  • G3P

    • What are the ATP and NADPH requirements to fix 6 molecules of CO2 in the C3 carbon fixation pathway?

    <p>18 ATP and 12 NADPH</p> Signup and view all the answers

    What is the process that involves photolysis of water, producing reduced NADPH and ATP?

    <p>Non-cyclic photophosphorylation</p> Signup and view all the answers

    How many photons are necessary to transport three electrons?

    <p>6</p> Signup and view all the answers

    In the Calvin cycle, what happens to RuBisCO when oxygen levels are high?

    <p>Incorporates O2</p> Signup and view all the answers

    Which enzyme is responsible for the initial fixation of carbon dioxide into an organic molecule in photosynthetic organisms?

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

    What is the primary role of Pheophytin in the photosynthetic process?

    <p>It serves as the primary electron acceptor</p> Signup and view all the answers

    Which term describes the adaptation in C4 plants that allows CO2 to be fixed and stored effectively?

    <p>CO2 is fixed and stored in the leaf</p> Signup and view all the answers

    What are Quanta in the context of photosynthesis?

    <p>The packets of light energy absorbed by specific pigments</p> Signup and view all the answers

    What is the function of Plastocyanin in the photosynthetic pathway?

    <p>To transport electrons</p> Signup and view all the answers

    What describes the 'light compensation point' in photosynthesis?

    <p>The point where photosynthesis and respiration balance each other</p> Signup and view all the answers

    Which of the following is a factor that does NOT significantly affect the rate of photosynthesis?

    <p>Leaf Surface</p> Signup and view all the answers

    In the context of the C3 pathway, what is required for the production of ATP and NADPH?

    <p>Carbon dioxide and light</p> Signup and view all the answers

    What outcome does photorespiration represent in the photosynthetic process?

    <p>Release of CO2 during photosynthesis</p> Signup and view all the answers

    What is the primary enzyme responsible for the carboxylation phase of the Calvin-Benson Cycle?

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

    Which compounds are produced during the reduction phase of the Calvin-Benson Cycle?

    <p>3-PGA and G3P</p> Signup and view all the answers

    Where does the light-dependent reaction mainly occur in the chloroplast?

    <p>Thylakoid Membrane</p> Signup and view all the answers

    What role do ATP and NADPH play in the C3 pathway?

    <p>They are utilized for the reduction of 3-PGA to G3P.</p> Signup and view all the answers

    Which of the following statements about the flow of electrons in photosynthesis is true?

    <p>Electrons originate from water and end up at NADPH.</p> Signup and view all the answers

    In the context of chloroplast function, which is associated with the capture of light energy?

    <p>Thylakoid Membrane</p> Signup and view all the answers

    Which types of plants are shade obligate and sun obligate?

    <p>Shade obligate plants require low light, whereas sun obligate ones need full sun.</p> Signup and view all the answers

    The reactions that synthesize ATP and NADPH are part of which process?

    <p>Light Dependent Reactions</p> Signup and view all the answers

    Study Notes

    Test 2 Details

    • Course: 2024-1 BIOL2151
    • Topic: Week 10: Photosynthesis 2 and Growth & Development (14-17/10/24)
    • Test Name: Plant Physiology Test 2, 2024
    • Start Time: Tuesday, October 22, 2024, 10:08 AM
    • End Time: Tuesday, October 22, 2024, 11:21 AM
    • Time Taken: 1 hour and 13 minutes
    • Marks Scored: 54.00 out of 70.00
    • Grade: 77.14 out of 100.00

    Test Questions and Answers (Part 1)

    • Question 1: Correct. (Match pictures of plants to the correct carbon fixation pathway)

      • C4 Pathway: Sugarcane
      • C3 Pathway: Bean plant
      • CAM Pathway: Agave and Jade plant

    • Question 2: Incorrect. (Short answer).

      • Correct Answer: Photosynthetically Active Radiation

    • Question 3: Correct.

      • Correct Answer: True (referencing image of the light-dependent reactions in chloroplasts).

    • Question 4: Correct.

      • Correct Answer: light and uphill (Photosynthesis uses light energy to drive electrons away from the water molecule, which involves moving electrons uphill against their potential energy gradient)

    • Question 5: Correct.

      • Correct Answer: Water molecules are split to provide electrons for photosystem II. (The splitting of water molecules during photosynthesis releases electrons necessary for the process)

    • Question 6: Incorrect.

      • Correct Answer: False. (Rubisco acts as an oxygenase when oxygen levels are high, not low)

    • Question 7: Correct.

      • Correct Answer: 8 photons

    • Question 8: Correct.

      • Correct Answer: 18 ATP and 12 NADPH

    • Question 9: Incorrect.

      • Correct Answer: PGA

    • Question 10: Correct.

      • Correct Answer: Non-cyclic photophosphorylation

    • Question 11: Correct.

      • Correct Answer: True

    • Question 12: Correct.

      • Correct Answer: 6

    • Question 13: Correct (Matching questions about photosynthesis)

      • Is the primary electron acceptor, colorless chlorophyll a. → Pheophytin.
      • Enzyme that initiates carbon fixation in C4 plant species → PEPcase.
      • In Photosynthesis, these are the packets of light energy absorbed by specific pigments → Quanta.
      • A electron carrier with a small copper-containing protein → Plastocyanin.
      • Deathly adaptation by plants, from shade leaves to sun leaves → Solarization

    • Question 14: Correct.

      • Correct Answer: Light Compensation Point

    • Question 15: Correct.

      • Correct Answer: Leaf Surface (Not a factor when considering photosynthesis rate)

    • Question 16: Incorrect.

    • Question 17: Correct.

    • Correct Answer: CO2 is fixed and stored in the leaf

    • Question 18: Correct.

      • Correct Answer: Photorespiration

    • Question 19: Incorrect.

      • Correct Answer: Thylakoid membrane

    Test Questions and Answers (Part 2)

    • (incomplete data, no full question text available for Q20-24)*

    • Question 20: Incomplete question data

    • Question 21: Correct.

      • Correct Answer: Thylakoid Membrane or Stroma (depending on the specific processes)

    • Question 22: Correct.

      • Correct Answer: True

    • Question 23: Correct.

      • Correct Answer: Light-dependent reactions

    • Question 24: Correct.

      • Correct Answer: False

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    Test 2 2024 Plant Physiology PDF

    Description

    This quiz covers Week 10 topics in BIOL2151, including photosynthesis pathways and plant growth & development processes. Test your knowledge of carbon fixation and related concepts in plant physiology. Prepare for the upcoming test by reviewing the key concepts and answers provided.

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