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 green, we analyze the role of chlorophyll (both algae and ferns contain chlorophyll for photosynthesis). Chlorophyll absorbs light in the violet - blue range and reflects green light, which gives plants (including algae and ferns) 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: Chlorophyll does not absorb green light and reflect violet - blue; it's the opposite, so this is wrong.
• Option 3: Ferns also contain chlorophyll, not ferredoxin as the main pigment for color, so this is incorrect.
• Option 4: Algae contain chlorophyll, not ferredoxin for color, and the light absorption - reflection description is wrong.

Answer:

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