Photosynthesis: Light-Dependent and Light-Independent Stages

Biology

This content details the process of photosynthesis, breaking it down into its two main stages: the light-dependent reactions occurring in the thylakoid membranes and the light-independent Calvin cycle taking place in the stroma. It covers chloroplast ultrastructure, photosystems, photophosphorylation (cyclic and non-cyclic), carbon fixation, reduction, and regeneration of RuBP, as well as leaf adaptations for efficient light absorption.

Photosynthesis Cell Biology Biochemistry

18 Questions Medium Ages 14+ May 19, 2026

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About this Study Set

This study set covers Biology through 18 practice questions. This content details the process of photosynthesis, breaking it down into its two main stages: the light-dependent reactions occurring in the thylakoid membranes and the light-independent Calvin cycle taking place in the stroma. It covers chloroplast ultrastructure, photosystems, photophosphorylation (cyclic and non-cyclic), carbon fixation, reduction, and regeneration of RuBP, as well as leaf adaptations for efficient light absorption. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 18 questions from the Photosynthesis: Light-Dependent and Light-Independent Stages study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the overall equation for photosynthesis?

A 6CO2 + 6H2O + light energy → C6H12O6 + 6O2
B C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
C 6O2 + 6H2O + light energy → C6H12O6 + 6CO2
D C6H12O6 + light energy → 6CO2 + 6H2O + 6O2

2 Where does the light-dependent stage of photosynthesis occur?

A Stroma
B Thylakoid membranes
C Outer chloroplast membrane
D Intermembrane space

3 What are the main chemical energy carriers produced during the light-dependent stage?

A Glucose and starch
B ATP and NADPH
C CO2 and H2O
D ADP and Pi

4 In which part of the chloroplast does the Calvin cycle (light-independent stage) take place?

A Thylakoid lumen
B Grana
C Stroma
D Outer membrane

5 What is photophosphorylation?

A The splitting of water using light energy.
B The synthesis of ATP using light energy.
C The fixation of CO2 into carbohydrates.
D The release of oxygen from the chloroplast.

6 Which type of photophosphorylation produces both ATP and NADPH?

A Cyclic photophosphorylation
B Non-cyclic photophosphorylation
C Photorespiration
D Photolysis

7 The chloroplast has a double envelope. What is the function of the inner membrane?

A To be highly permeable to all metabolites.
B To control metabolite exchange.
C To absorb light energy.
D To house the Calvin cycle enzymes.

8 What is the stroma of the chloroplast?

A A stack of flattened sacs.
B The aqueous, enzyme-rich matrix containing DNA and ribosomes.
C The space between the outer and inner membranes.
D The site of photolysis.

9 What is a granum?

A A single flattened sac within the thylakoid system.
B A stack of 10-100 thylakoids.
C The outer boundary of the chloroplast.
D The fluid-filled space outside the thylakoids.

10 Which pigment is the primary chlorophyll in Photosystem II (PSII) and Photosystem I (PSI) reaction centers?

A Chlorophyll b
B Carotenoids
C Chlorophyll a (P680 and P700)
D Xanthophylls

11 What is the role of antenna complexes in photosynthesis?

A To directly produce ATP.
B To funnel light energy to the reaction center.
C To split water molecules.
D To reduce NADP+.

12 How are palisade mesophyll cells adapted for light interception?

A They are irregularly shaped and loosely packed.
B They contain few chloroplasts and are located at the bottom of the leaf.
C They are tall, tightly packed, and contain many chloroplasts pushed to the periphery.
D They have thick cell walls to prevent water loss.

13 What is the reaction center of Photosystem II (PSII) called and what wavelength of light does it absorb?

A P700, 700nm
B P680, 680nm
C P500, 500nm
D P800, 800nm

14 What is the function of the oxygen-evolving complex on the lumen side of PSII?

A To pump protons into the stroma.
B To release O2, H+, and electrons from water.
C To excite electrons in P700.
D To produce ATP.

15 Which molecule acts as the primary electron acceptor after excitation at PSII?

A Plastoquinone (PQ)
B Ferredoxin (Fd)
C Pheophytin
D Plastocyanin (PC)

16 During electron transport from PSII to PSI, protons are pumped from the stroma to the lumen via which complex?

A Photosystem I
B Plastoquinone
C Cytochrome b6f complex
D ATP synthase

17 What is the reaction center of Photosystem I (PSI) called and what wavelength of light does it absorb?

A P680, 680nm
B P700, 700nm
C P500, 500nm
D P800, 800nm

18 Which enzyme is responsible for reducing NADP+ to NADPH using electrons from ferredoxin?

A Rubisco
B Phosphoglycerate kinase
C G3P dehydrogenase
D Ferredoxin-NADP+ reductase (FNR)

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