30 Questions
What is the primary function of stomata in leaves?
To facilitate gas exchange
What is the role of chlorophyll in photosynthesis?
To capture light energy
What is the region within the chloroplast where carbon dioxide is first attached to an organic compound and then reduced to a carbohydrate?
Stroma
What is the term for the regions on the surface of the Earth and in the atmosphere where living organisms exist?
Biosphere
What is the type of reaction that occurs in the absence of light?
Dark reaction
What is the function of the energized electrons in the light reaction?
To capture energy and produce ATP and NADPH
What is the result of NADP+ accepting electrons in the light reaction?
It becomes NADPH
What is the term for organisms that make their own organic molecules from inorganic sources?
Autotroph
In which stage of photosynthesis is CO2 taken up and reduced to a carbohydrate?
Calvin cycle reaction
What is the equation for photosynthesis?
CO2 + H2O + light energy → C6H12O6 + O2 + H2O
What is the role of pigments in thylakoid membranes?
To absorb solar energy
What is the outcome of the cyclic photophosphorylation process?
Production of ATP only
What is the characteristic of shorter wavelengths of electromagnetic radiation?
They have more energy
Why do leaves appear green?
They reflect green wavelengths
What happens to an electron after it absorbs energy from light?
It releases energy as heat and light
What is the role of carotenoids in photosynthesis?
They absorb violet-blue-green wavelengths
What is the result of an electron being boosted to a higher energy level?
It is transferred to another molecule
What determines the wavelength of light that a pigment absorbs?
The amount of energy needed to boost an electron to a higher orbital
What is the primary function of the electron transport chain in photosynthesis?
To pump H+ into the lumen
What is the byproduct of the light reaction that is used in the Calvin cycle?
NADPH
What is the difference between cyclic and noncyclic electron flow?
Cyclic electron flow produces only ATP, while noncyclic electron flow produces ATP and NADPH
What is the role of plastocyanin in the light reaction?
It replaces the electrons in P680+
What is the outcome of the high-energy electron transfer from PSII to PSI?
The formation of NADPH
What is the function of the H+ electrochemical gradient in ATP synthesis?
To drive the synthesis of ATP
What is the term for the wavelengths of light that are absorbed by different pigments in a plant?
Absorption spectrum
What is the role of the light-harvesting complex in Photosystem II?
To transfer energy to the reaction center
What is the result of the oxidation of water in Photosystem II?
Yielding of oxygen gas
Where is the electron transport system chain located in Photosystem II?
In the thylakoid membrane
What is the energy state of P680 after it absorbs a photon?
Relatively unstable
Where do the electrons accepted by the primary electron acceptor in PSII eventually end up?
In the pigment molecule in the reaction center of PSI
Test your knowledge of photosynthesis, including the general equation, chloroplast structure, and the light and dark reactions. Learn how autotrophs and photoautotrophs sustain life and power the biosphere.
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