The step in photosynthesis that does not require light is the Calvin cycle, also known as the light-independent reactions or the dark reactions. During this phase, carbon dioxide and hydrogen (from water) combine to form glucose. However, the specific options you've listed don't directly mention the Calvin cycle.
From the options:
- A) Carbon dioxide and hydrogen combine to make glucose (this refers to the Calvin cycle).
- B) Oxygen is released (this occurs in the light-dependent reactions, where water splits).
- C) Chlorophyll absorbs energy (this occurs in the light-dependent reactions).
- D) Water splits into hydrogen and oxygen (this also occurs in the light-dependent reactions).
So, the best answer based on your options is: A) Carbon dioxide and hydrogen combine to make glucose.
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