Welcome to the Light Dependent and Light Independent Phases MDCAT MCQs with Answers. In this post, we have shared Light Dependent and Light Independent Phases Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Light Dependent and Light Independent Phases MCQs in this MDCAT Online Test.
Which phase of photosynthesis occurs in the thylakoid membranes of the chloroplasts?
a) Light-dependent phase
b) Light-independent phase
c) Calvin cycle
d) Krebs cycle
What is the primary function of the light-dependent reactions in photosynthesis?
a) To produce glucose
b) To fix carbon dioxide
c) To generate ATP and NADPH
d) To release oxygen
Which molecule acts as the electron carrier in the light-dependent reactions?
a) NADH
b) NADPH
c) ATP
d) FADH2
In which part of the chloroplast do the light-independent reactions occur?
a) Thylakoid membrane
b) Stroma
c) Outer membrane
d) Inner membrane
Which process occurs during the light-dependent phase of photosynthesis?
a) Carbon fixation
b) Reduction of NADP+ to NADPH
c) Synthesis of glucose
d) Oxygen production
What is the role of water in the light-dependent reactions?
a) To act as a proton donor
b) To release oxygen through photolysis
c) To fix carbon dioxide
d) To synthesize glucose
Which pigment is primarily responsible for capturing light energy in the chloroplasts?
a) Carotene
b) Xanthophyll
c) Chlorophyll
d) Anthocyanin
What is the end product of the Calvin cycle?
a) ATP
b) NADPH
c) Glucose
d) Oxygen
Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?
a) Rubisco
b) ATP synthase
c) NADP+ reductase
d) Phosphofructokinase
What are the two main products of the light-dependent reactions used in the Calvin cycle?
a) Oxygen and glucose
b) NADPH and ATP
c) Water and carbon dioxide
d) ADP and NADP+
Which process is responsible for the production of ATP during the light-dependent reactions?
a) Chemiosmosis
b) Photolysis
c) Carbon fixation
d) Electron transport chain
What is the role of the electron transport chain in the light-dependent reactions?
a) To produce glucose
b) To create a proton gradient
c) To fix carbon dioxide
d) To reduce NADP+ to NADPH
In which part of the chloroplast does photolysis of water occur?
a) Stroma
b) Thylakoid membrane
c) Outer membrane
d) Inner membrane
Which molecule is produced as a byproduct of the light-dependent reactions?
a) Carbon dioxide
b) Oxygen
c) Glucose
d) NADH
Which component of the light-dependent reactions generates ATP?
a) Photosystem I
b) Photosystem II
c) ATP synthase
d) Cyclic electron flow
What role does the Calvin cycle play in photosynthesis?
a) To generate ATP and NADPH
b) To convert carbon dioxide into glucose
c) To capture light energy
d) To produce oxygen
How many molecules of carbon dioxide are required to produce one molecule of glucose in the Calvin cycle?
a) 1
b) 2
c) 3
d) 6
Which light-dependent reaction occurs first in the photosynthetic process?
a) Reduction of NADP+
b) Photolysis of water
c) Generation of ATP
d) Absorption of light by chlorophyll
Which part of the chloroplast is involved in the Calvin cycle?
a) Thylakoid membrane
b) Stroma
c) Outer membrane
d) Inner membrane
Which photosystem is associated with the production of NADPH?
a) Photosystem I
b) Photosystem II
c) Both Photosystem I and II
d) Neither Photosystem I nor II
What is the main role of RuBisCO in the Calvin cycle?
a) To generate ATP
b) To fix carbon dioxide
c) To produce NADPH
d) To release oxygen
What happens during the reduction phase of the Calvin cycle?
a) Carbon dioxide is fixed
b) ATP and NADPH are used to convert 3-PGA to G3P
c) G3P is converted to RuBP
d) Oxygen is released
Which of the following is a product of the light-independent reactions?
a) Oxygen
b) ATP
c) NADPH
d) Glucose
Which process in the light-dependent reactions involves the movement of electrons through a series of proteins?
a) Photolysis
b) Electron transport chain
c) Calvin cycle
d) Chemiosmosis
What is the primary role of ATP in the light-independent reactions?
a) To capture light energy
b) To provide energy for the synthesis of glucose
c) To release oxygen
d) To transport electrons
Which molecule is regenerated in the final step of the Calvin cycle?
a) NADPH
b) ATP
c) RuBP
d) G3P
What is the primary role of NADPH in the Calvin cycle?
a) To provide energy for glucose synthesis
b) To provide reducing power for the conversion of 3-PGA to G3P
c) To fix carbon dioxide
d) To transport electrons
Which of the following is a direct product of the light-dependent reactions used in the Calvin cycle?
a) Water
b) Oxygen
c) ATP and NADPH
d) Carbon dioxide
What is the role of the thylakoid membrane in photosynthesis?
a) To absorb light and facilitate the light-dependent reactions
b) To synthesize glucose
c) To fix carbon dioxide
d) To release oxygen
Which molecule is directly involved in the electron transport chain of the light-dependent reactions?
a) NADP+
b) FAD
c) Cyclic AMP
d) ATP
What is the primary role of photolysis in the light-dependent reactions?
a) To split water molecules and release oxygen
b) To synthesize ATP
c) To fix carbon dioxide
d) To reduce NADP+
Which light-dependent reaction results in the formation of a proton gradient?
a) Photolysis
b) Electron transport chain
c) Calvin cycle
d) Carbon fixation
Which photosystem is primarily involved in the production of ATP?
a) Photosystem I
b) Photosystem II
c) Both Photosystem I and II
d) Neither Photosystem I nor II
How many molecules of ATP are required to regenerate RuBP in the Calvin cycle?
a) 1
b) 2
c) 3
d) 5
Which enzyme in the Calvin cycle is responsible for catalyzing the reaction that incorporates carbon dioxide into RuBP?
a) ATP synthase
b) Rubisco
c) NADP+ reductase
d) Phosphoglycerate kinase
Which phase of photosynthesis does not require light directly?
a) Light-dependent reactions
b) Light-independent reactions
c) Calvin cycle
d) Both b and c
What happens to the energy from light absorption in the light-dependent reactions?
a) It is used to fix carbon dioxide
b) It is stored as glucose
c) It is used to generate ATP and NADPH
d) It is used to release oxygen
Which of the following is NOT a product of the Calvin cycle?
a) Glucose
b) RuBP
c) NADPH
d) G3P
What is the primary function of the light-independent reactions?
a) To absorb light energy
b) To convert light energy into chemical energy
c) To convert chemical energy into glucose
d) To release oxygen
What is the main source of energy for the Calvin cycle?
a) Light energy
b) ATP
c) NADPH
d) Both b and c
Which reaction involves the conversion of 3-PGA to G3P in the Calvin cycle?
a) Reduction
b) Carbon fixation
c) Regeneration
d) Photolysis
What is the role of ATP and NADPH in the Calvin cycle?
a) To fix carbon dioxide
b) To convert G3P to glucose
c) To provide energy and reducing power for carbon fixation
d) To release oxygen
Which process in photosynthesis is responsible for oxygen production?
a) Calvin cycle
b) Light-dependent reactions
c) Glycolysis
d) Krebs cycle
Which phase of photosynthesis is known as the dark reactions?
a) Light-dependent phase
b) Light-independent phase
c) Calvin cycle
d) Both b and c
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