Multiple Choice
Which of the following is the most likely reason for the difference in leaf growth between two plants, if one is grown in full sunlight and the other in low light conditions?
95
views
9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
What happens when light strikes the chlorophyll molecules of photosystems I and II during photosynthesis?
A
ATP is directly synthesized from chlorophyll molecules.
B
Electrons in the chlorophyll molecules become excited and are transferred to electron acceptors.
C
Water molecules are immediately converted into carbon dioxide.
D
Chlorophyll molecules are broken down into glucose and oxygen.
Verified step by step guidance1
Step 1: Understand the role of chlorophyll in photosynthesis. Chlorophyll is a pigment found in the thylakoid membranes of chloroplasts, and it absorbs light energy to drive the process of photosynthesis.
Step 2: Learn about photosystems I and II. These are protein-pigment complexes in the thylakoid membrane that play a key role in capturing light energy. Photosystem II absorbs light first, followed by Photosystem I.
Step 3: When light strikes chlorophyll molecules in Photosystem II, the energy excites electrons in the chlorophyll. These high-energy electrons are transferred to the primary electron acceptor in the photosystem.
Step 4: The excited electrons from Photosystem II are passed through the electron transport chain, which helps generate a proton gradient used to synthesize ATP. Meanwhile, water molecules are split (photolysis) to replace the lost electrons, releasing oxygen as a byproduct.
Step 5: In Photosystem I, light energy excites electrons again, and these electrons are transferred to another electron acceptor. The electrons are eventually used to reduce NADP⁺ to NADPH, which is essential for the Calvin cycle in photosynthesis.
Related Videos
Related Practice
