Question

why are algae and ferns both green?
○ they each contain chlorophyll that absorbs violet - blue light and reflects green light.
○ they each contain chlorophyll that absorbs green light and reflects violet - blue light.
○ algae contain chlorophyll, and ferns contain ferredoxin that absorbs violet - blue light and reflects green light.
○ ferns contain chlorophyll, and algae contain ferredoxin that absorbs green light and reflects violet - blue light.

Explanation:

To determine why algae and ferns are both green, we analyze the role of chlorophyll. Chlorophyll is the pigment responsible for photosynthesis in plants (including algae and ferns). Chlorophyll absorbs light in the violet - blue range and reflects green light, which gives these organisms their green color.

• Option 1: States they each have chlorophyll that absorbs violet - blue and reflects green light. This matches the properties of chlorophyll.
• Option 2: Incorrectly claims chlorophyll absorbs green light and reflects violet - blue, which is the opposite of how chlorophyll works.
• Option 3: Incorrectly says ferns have ferredoxin (ferredoxin is involved in electron transport, not pigmentation for color) and algae have chlorophyll. Both algae and ferns have chlorophyll.
• Option 4: Incorrectly attributes the color - related pigment to ferredoxin in algae and chlorophyll in ferns, and also misstates the light absorption/reflection of the supposed pigment.

Answer:

A. They each contain chlorophyll that absorbs violet - blue light and reflects green light.