Photosynthesis Flashcards
What are the two main stages of photosynthesis?
Light-dependent reactions and light-independent reactions (Calvin cycle).
True or False: Light-dependent reactions occur in the stroma of chloroplasts.
False. They occur in the thylakoid membranes.
Fill in the blank: The primary pigment involved in photosynthesis is _____ .
chlorophyll.
What is the main purpose of light-dependent reactions?
To convert light energy into chemical energy in the form of ATP and NADPH.
Which molecule is split during the light-dependent reactions?
Water (H2O).
What is released as a byproduct of water splitting in light-dependent reactions?
Oxygen (O2).
What are the two main products of light-dependent reactions?
ATP and NADPH.
Multiple Choice: Which of the following is NOT a part of the light-dependent reactions? A) Photosystem I B) Calvin Cycle C) Electron Transport Chain
B) Calvin Cycle.
What role do electron carriers play in light-dependent reactions?
They transport electrons from one protein complex to another in the electron transport chain.
True or False: Light-dependent reactions can occur without sunlight.
False.
What is the function of ATP synthase in light-dependent reactions?
To synthesize ATP from ADP and inorganic phosphate using the proton gradient.
Fill in the blank: The energy from light is absorbed by _____ in the thylakoid membranes.
photosystems.
What is the role of NADP+ in light-dependent reactions?
It acts as an electron carrier, becoming reduced to NADPH.
Multiple Choice: Which wavelength of light is most effectively absorbed by chlorophyll? A) Green light B) Red light C) Blue light
B) Red light.
What happens to the energy of electrons as they move through the electron transport chain?
It is gradually released and used to pump protons into the thylakoid lumen.
True or False: The Calvin cycle is part of the light-dependent reactions.
False. It is part of the light-independent reactions.
What is the role of water in the light-dependent reactions?
It provides electrons and protons through the process of photolysis.
Fill in the blank: The light-dependent reactions convert _____ energy into chemical energy.
light.
What is the significance of the proton gradient created during light-dependent reactions?
It drives the synthesis of ATP via ATP synthase.
Multiple Choice: Which complex is involved in the initial absorption of light? A) Photosystem II B) Photosystem I C) ATP synthase
A) Photosystem II.
What is the final electron acceptor in the light-dependent reactions?
NADP+.
True or False: Light-dependent reactions produce glucose directly.
False.
What type of radiation is primarily used in light-dependent reactions?
Visible light.
Fill in the blank: The light-dependent reactions occur in the _____ of chloroplasts.
thylakoid membranes.
