The graph showing rate of photosynthesis at different wavelength of light is called

Options

A. absorption spectrum
B. action spectrum
C. Both (a) and (b)
D. None of these

Answer

To answer the question about the graph showing the rate of photosynthesis at different wavelengths of light, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of the graph that represents the rate of photosynthesis at various wavelengths of light.

2. **Identifying Key Terms**: The key terms in the question are "rate of photosynthesis" and "different wavelengths of light."

3. **Defining Relevant Concepts**:
- **Action Spectrum**: This graph shows the rate of photosynthesis at different wavelengths of light. It indicates how effectively different wavelengths contribute to the process of photosynthesis.
- **Absorption Spectrum**: This graph shows how much light is absorbed by chlorophyll at different wavelengths, but it does not measure the rate of photosynthesis directly.

4. **Analyzing the Options**:
- **Option 1: Absorption Spectrum** - This is incorrect as it relates to light absorption, not the rate of photosynthesis.
- **Option 2: Action Spectrum** - This is correct as it specifically relates to the rate of photosynthesis at various wavelengths.
- **Option 3: Both A and B** - This is incorrect since only one option is relevant to the question.
- **Option 4: None of these** - This is also incorrect as we have identified the correct term.

5. **Conclusion**: The correct answer is **Option 2: Action Spectrum**. This graph illustrates how different wavelengths of light affect the rate of photosynthesis.

### Final Answer:
The graph showing the rate of photosynthesis at different wavelengths of light is called the **Action Spectrum**.

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