All of the following statements are true EXCEPT
Thylakoid membranes contain photosynthetic pigment
The O2 released during photosynthesis comes from water
G3P is produced only in the light reactions of photosynthesis
The light reactions of photosynthesis provide the energy for the Calvin cycle
When chlorophyll is reduced, it gains electrons
The statement "G3P is produced only in the light reactions of photosynthesis" is not true. G3P, or glyceraldehyde 3-phosphate, is produced in the Calvin cycle, which is the second stage of photosynthesis.
To determine which statement is false, let's analyze each statement individually and consider if it is accurate or inaccurate.
1. Thylakoid membranes contain photosynthetic pigment:
This statement is true. Thylakoid membranes are found in chloroplasts, and they contain photosynthetic pigments such as chlorophyll that capture light energy for photosynthesis.
2. The O2 released during photosynthesis comes from water:
This statement is true. During the light reactions of photosynthesis, water molecules are split, and the oxygen gas (O2) is released as a byproduct. This process is known as photolysis.
3. G3P is produced only in the light reactions of photosynthesis:
This statement is false. G3P (glyceraldehyde 3-phosphate) is an intermediate molecule that is produced during the light-independent reactions, specifically the Calvin cycle, not the light reactions.
4. The light reactions of photosynthesis provide the energy for the Calvin cycle:
This statement is true. The light reactions of photosynthesis occur in the thylakoid membranes and capture light energy. This energy is used to produce ATP and NADPH, which are utilized in the Calvin cycle for the production of glucose.
5. When chlorophyll is reduced, it gains electrons:
This statement is true. During photosynthesis, chlorophyll molecules gain electrons when they absorb light energy. This process is referred to as reduction, and it results in the conversion of light energy into chemical energy.
Therefore, the false statement is: "G3P is produced only in the light reactions of photosynthesis." G3P is actually produced in the light-independent reactions or Calvin cycle.