Multiple Choice
In the context of photosynthesis, what is the primary energy source that drives the process?
111
views
9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
What process during photosynthesis is responsible for the release of oxygen into Earth's atmosphere?
A
The conversion of glucose to pyruvate during glycolysis
B
The splitting of water molecules (photolysis) during the light-dependent reactions
C
The absorption of sunlight by chlorophyll
D
The fixation of carbon dioxide during the Calvin cycle
Verified step by step guidance1
Understand that photosynthesis consists of two main stages: the light-dependent reactions and the Calvin cycle (light-independent reactions). Oxygen release occurs during the light-dependent reactions.
Recognize that the splitting of water molecules (photolysis) is a key event in the light-dependent reactions. This process occurs in the thylakoid membranes of chloroplasts.
During photolysis, water molecules (H₂O) are broken down into oxygen gas (O₂), protons (H⁺), and electrons. The chemical reaction can be represented as:
The electrons released during photolysis are used to replace those lost by chlorophyll molecules in Photosystem II after they absorb sunlight. This ensures the continuation of the light-dependent reactions.
The oxygen gas (O₂) produced during photolysis is released into Earth's atmosphere as a byproduct of photosynthesis, contributing to the oxygen we breathe.
Related Videos
Related Practice
