Action spectrum of photosyntheic pigments was studied by Englemann on _______ in the presence of _______ bacteria

Options

A. Spirogyra , Anaerobic
B. Cladphora , Aerobic
C. Chlorella , Aerobic
D. Scenedesmus, Anaerobic

Answer

**Step-by-Step Text Solution:**

1. **Identify the Scientist and Experiment**: The question asks about the action spectrum of photosynthetic pigments studied by Engelmann. Engelmann is known for his experiments on photosynthesis.

2. **Determine the Organism Used**: Engelmann conducted his experiment on a green alga called Cladophora. This organism was chosen for its ability to perform photosynthesis.

3. **Identify the Type of Bacteria Used**: In Engelmann's experiment, he used aerobic bacteria. These bacteria were crucial for detecting the oxygen produced during photosynthesis.

4. **Explain the Experimental Setup**: Engelmann used a prism to split light into its spectral components. He illuminated the Cladophora with this split light to observe the photosynthetic activity.

5. **Observe the Results**: The aerobic bacteria accumulated mainly in the regions of blue and red light, indicating that these wavelengths were most effective for photosynthesis.

6. **Conclude the Answer**: Therefore, the action spectrum of photosynthetic pigments was studied by Engelmann on Cladophora in the presence of aerobic bacteria.

**Final Answer**: The action spectrum of photosynthetic pigments was studied by Engelmann on **Cladophora** in the presence of **aerobic bacteria**.

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