Many species of red algae are adapted to deeper water due to the fact that __________.

• A. their red pigments readily absorb red light
• B. their cell walls are adapted to withstand bright light
• C. they grow long stalks with floats on the ends to hold the blades near the surface
• D. All of the listed responses are correct.
• E. their photosynthetic pigments efficiently absorb blue and green light

Answer: (E)

Verified step by step guidance

1. Understand the problem: The question is about the adaptation of red algae to deeper water environments. We need to identify the reason for this adaptation based on their characteristics.
2. Identify the key concept: Red algae have specialized photosynthetic pigments. These pigments are crucial for their survival and adaptation to different light conditions in aquatic environments.
3. Consider the light absorption properties: In deeper water, red light is absorbed quickly, leaving primarily blue and green light. Red algae have pigments that can efficiently absorb these wavelengths.
4. Analyze the options: The correct adaptation should relate to the ability of red algae to utilize the available light in deeper waters. The option that mentions the efficient absorption of blue and green light by their pigments aligns with this requirement.
5. Conclude the reasoning: The adaptation of red algae to deeper water is primarily due to their photosynthetic pigments, which are efficient at absorbing the blue and green light that penetrates deeper into the water.