Question

Which of the following are required for the light reaction of Photosynthesis?
A. \(CO_2\)
B. \(O_2\)
C.\( H_2O\)
D. Chlorophyll 
E. Light
Choose the correct answer from the options given below

• A. A, C, D and E only
• B. C, D and E only
• C. A and B only
• D. A, C and E only

Answer 1

The Correct Option is B

The question asks for components required for the light reaction of photosynthesis. To solve this, let's consider each option:

1. \(CO_2\): This is involved in the Calvin cycle (light-independent reaction), not directly in the light reaction. Thus, it is not required for the light reaction.
2. \(O_2\): Oxygen is a by-product of the light reaction, produced when water molecules are split, but it is not a requirement or reactant for the process of the light reaction. 
3. \(H_2O\): Water is essential for the light reaction as it provides electrons and protons when it is split (photolysis) during the process.
4. Chlorophyll: This pigment is crucial as it absorbs light energy, which is further converted to chemical energy during the light reactions.
5. Light: Light is the energy source that drives the reactions, so it is fundamental for the light reactions to occur.

Based on these reasons, the correct answer is:

C, D and E only

Hence, the components required for the light reaction of photosynthesis are \(H_2O\), Chlorophyll, and Light.