Respuesta :
If no photosynthesis is occurring, but the algae are still respiring, the color would expect the indicator to change into yellow.
In the dark, only respiration takes place because there isn't enough light for photosynthesis; as a result, only oxygen enters and carbon dioxide leaves the leaf. The hydrogencarbonate indicator turns yellow when carbondioxide from the leaf is released into it, turning it from red.Because chlorophyll absorbs all other colours but the green wavelengths in sunlight, it gives plants and algae their characteristic green color. For more effective photosynthesis, the various types of chlorophyll absorb slightly different wavelengths.Nearly all algae engage in the process, and in fact, much of what is currently known about photosynthesis was first uncovered through research on the green alga Chlorella. Chlorophyll is used by green algae in the genus Hyalotheca, a family of filamentous desmids (class Charophyceae), to absorb solar energy for photosynthesis.
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