Products of light reaction are

Options

A. 1.`O_2` and `CO_2`
B. 2.`CO_2` and `H_2O`
C. 3.ATP and NADPH
D. 4.ATP and `CO_2`

Answer

To solve the question regarding the products of the light reaction in photosynthesis, we can follow these steps:

### Step 1: Understand the Light Reaction
The light reaction of photosynthesis occurs in the thylakoid membranes of chloroplasts. It involves the absorption of light energy by chlorophyll, which leads to the generation of energy-rich molecules.

**Hint:** Remember that the light reaction is the first stage of photosynthesis and occurs in the presence of light.

### Step 2: Identify the Key Products
During the light reaction, the absorbed light energy is used to split water molecules (photolysis), which releases oxygen (O2) as a byproduct. Additionally, the energy captured is used to produce ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

**Hint:** Focus on the energy carriers produced during the light reaction, which are essential for the next stage of photosynthesis.

### Step 3: Analyze the Options
Now, let's analyze the options provided in the question:
- O2 and CO2
- CO2 and H2O
- ATP and NADPH
- ATP and CO2

From our understanding, the light reaction produces ATP, NADPH, and O2. Therefore, the correct answer from the options is ATP and NADPH.

**Hint:** Eliminate options that include CO2, as it is not a product of the light reaction but rather a reactant in the dark reaction (Calvin cycle).

### Step 4: Conclusion
The products of the light reaction are ATP and NADPH, which are utilized in the dark reactions (Calvin cycle) to fix carbon dioxide into glucose.

**Final Answer:** The correct answer is ATP and NADPH.