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06/12 Photosynthesis and Biological Energy Capture Online Quiz Questions

Use this free practice quiz with 20 questions to review 06/12 Photosynthesis and Biological Energy Capture, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

Where do the light-dependent reactions of photosynthesis primarily occur in a chloroplast?

  1. A

    The chloroplast stroma

  2. B

    The thylakoid membrane

  3. C

    The outer chloroplast envelope

  4. D

    The cytoplasm

02
True or false
1 point

True or false: The oxygen released during oxygenic photosynthesis originates from the oxidation of water.

  1. A

    True

  2. B

    False

03
Choose one
1 point

Which stomatal pattern is characteristic of CAM plants?

  1. A

    They open stomata only during the hottest part of the day.

  2. B

    They keep stomata permanently open.

  3. C

    They generally open stomata at night.

  4. D

    They obtain carbon dioxide only from soil minerals.

04
Written response
1 point

In a floating-leaf-disk assay, what does ET₅₀ measure?

05
Fill in the blank
1 point

Complete the statement: The primary reaction-center pigment in plants is .

06
True or false
1 point

True or false: Calling the Calvin cycle the “dark reactions” is fully accurate because the cycle functions independently of the light-dependent reactions.

  1. A

    True

  2. B

    False

07
Written response
1 point

What Calvin-cycle stage uses ATP to rearrange five G3P molecules into three molecules of RuBP?

08
Choose one
1 point

How does C₄ photosynthesis reduce photorespiration?

  1. A

    They use only cyclic electron flow around PSI.

  2. B

    They separate initial carbon fixation from RuBisCO spatially.

  3. C

    They open stomata only at night.

  4. D

    They eliminate the need for ATP in carbon fixation.

09
Fill in the blank
1 point

Name the three functional stages of the Calvin–Benson cycle in order: , , and .

10
Choose all
1 point

Select all changes that could increase the rate of photosynthesis under the stated limiting conditions.

  1. A

    Increasing light intensity when light is limiting

  2. B

    Increasing carbon dioxide concentration when carbon dioxide is limiting

  3. C

    Increasing light intensity indefinitely under all conditions

  4. D

    Improving water availability when water stress is limiting

11
Choose all
1 point

Select all features that would strengthen an experiment testing how light intensity affects photosynthetic rate with leaf disks.

  1. A

    Deliberately manipulating one independent variable

  2. B

    Measuring a defined dependent variable such as ET₅₀

  3. C

    Changing temperature and light intensity together without tracking either one

  4. D

    Using replication and keeping relevant conditions constant

12
Open ended
1 point

Explain why floating leaf disks can be used as an indirect measure of photosynthetic activity, and identify two limitations or controls that should be considered when interpreting the assay.

13
Choose one
1 point

A plant has closed stomata on a hot day. Which outcome is most likely to contribute to reduced photosynthetic efficiency?

  1. A

    High internal carbon dioxide and cool temperatures

  2. B

    Complete absence of oxygen and abundant water

  3. C

    Low internal carbon dioxide and high temperatures

  4. D

    High carbon dioxide and moderate temperatures

14
True or false
1 point

True or false: Calling the Calvin cycle the “dark reactions” can be misleading because the cycle normally depends on products and regulatory conditions associated with the light reactions.

  1. A

    True

  2. B

    False

15
Choose one
1 point

A plant cell is producing ATP and NADPH from light energy. Which chloroplast region contains the main machinery carrying out these light-dependent reactions?

  1. A

    The stroma

  2. B

    The thylakoid membrane

  3. C

    The thylakoid lumen

  4. D

    The outer envelope membrane

16
Choose one
1 point

In the linear electron-flow pathway of oxygenic photosynthesis, which photosystem receives the electron first?

  1. A

    Photosystem I because its number is lower

  2. B

    Photosystem I because it transfers electrons to NADP⁺

  3. C

    Photosystem II because electrons pass through it before Photosystem I

  4. D

    Neither photosystem because electrons come directly from carbon dioxide

17
Written response
1 point

Which molecule is oxidized to provide replacement electrons for Photosystem II during oxygenic photosynthesis?

18
Choose one
1 point

Which statement best describes the trade-off caused by opening stomata on a leaf?

  1. A

    Carbon dioxide enters while water vapor can escape

  2. B

    Oxygen enters while carbon dioxide is released

  3. C

    Water enters while carbon dioxide is prevented from entering

  4. D

    Carbon dioxide and water vapor are both prevented from diffusing

19
Choose one
1 point

A researcher observes that ATP and NADPH are being used to convert 3-phosphoglycerate into glyceraldehyde-3-phosphate. Which functional stage of the Calvin cycle is being observed?

  1. A

    Carbon fixation

  2. B

    Reduction

  3. C

    RuBP regeneration

  4. D

    Stomatal opening

20
Written response
1 point

What process results when RuBisCO reacts with oxygen instead of carbon dioxide, reducing photosynthetic efficiency?