First Actions spectrum was obtained by using__________?
Correct answer: D. Spirogyra
- A. Algae
- B. Fungi
- C. Bacteria
- D. Spirogyra
Explanation
T.W. Engelmann obtained the first action spectrum using the filamentous green alga Spirogyra and aerobic bacteria that gathered near regions releasing the most oxygen. Students may choose algae because Spirogyra is an alga, but the question asks for the specific organism used, which was Spirogyra.
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