T.W. Englemann determined action spectrum of photosynthesis as the

Options

A. amount of `COunderset(2)` released
B. amount of `Hunderset(2)`O released
C. amount of `Ounderset(2)` released
D. amount of `COunderset(2)` reduced

Answer

**Step-by-Step Solution:**

1. **Understanding the Action Spectrum**: The action spectrum of photosynthesis refers to the range of wavelengths of light that are effective in driving the process of photosynthesis. It indicates which colors of light are most useful for plants in photosynthesis.

2. **T.W. Engelman's Experiment**: In the years 1881 and 1882, T.W. Engelman conducted experiments to determine the action spectrum of photosynthesis. He used a prism to separate light into its component colors and then observed the effect of different colors on photosynthetic activity.

3. **Observations Made by Engelman**: Engelman discovered that different colors of light (wavelengths) had varying effects on the rate of photosynthesis. He noted that blue and red light were particularly effective in promoting photosynthesis, while green light was less effective.

4. **Conclusion on Photosynthetic Activity**: Engelman's findings led him to conclude that the photosynthetic activity varies with different wavelengths of light. This means that plants utilize light energy from specific parts of the spectrum more efficiently than others.

5. **Significance of Engelman's Work**: Engelman's work was significant because it helped in understanding how plants convert light energy into chemical energy during photosynthesis, leading to oxygen production and carbon dioxide absorption.

6. **Final Answer**: T.W. Engelman determined the action spectrum of photosynthesis as the spectrum of light that varies in effectiveness for photosynthesis, with blue and red light being the most effective.