yes they can absorb blue and black chloroplasts which are the only chloroplasts found deep in the ocean, many fish can't.
I'm not sure if that's true but they can live in great depths because of their ability to harvest light energy.
Red Algae
camouflage and water absorbing.
Because algae is so numerous in the ocean
Red light does not penetrate to depths where red algae can carry out photosynthesis. This is why red algae have evolved to absorb blue and green light for photosynthesis at these depths.
Accessory pigments absorb light at different wavelengths than does chlorophyll. This process tends to increase the range of depths at which algae can grow. For example, the reddish accessory pigments called phycobilins are especially good at absorbing the blue light found at great depths in the sea, allowing the algae that contain them to live in deep water. Because accessory pigments reflect different wavelengths of light than does chlorophyll, they give algae a wide range of colors.
Marine algae have specialized pigments that enable them to capture sunlight for photosynthesis. Below 200 meters, there is not enough sunlight for photosynthesis to occur efficiently. Additionally, pressure and temperature conditions at those depths make it challenging for marine algae to survive.
The answer to this question is because of the efficiency of different pigments to absorb light of different wavelengths. For example, the pigment in red algae can absorb blue-green light that penetrates to greater depths.
Marine algae require sunlight for photosynthesis, which is limited at depths below 200 meters due to decreased light penetration. Without sufficient light, marine algae cannot photosynthesize effectively and survive in deeper waters.
Because their symbiotic algae are photosynthetic and require light and warmth from the sun.
Marine algae require sunlight for photosynthesis, which is the process that provides them with energy. Light penetration decreases with depth, leading to insufficient light for photosynthesis beyond 200 meters. This absence of marine algae at depths below 200 meters can limit the availability of food and oxygen for other marine organisms, impacting the overall biodiversity and food web dynamics in these deep-sea ecosystems.
Accessory pigments found in red algae that are good at absorbing blue light are called phycobiliproteins, specifically phycocyanin and allophycocyanin. These pigments help red algae efficiently capture and use blue light for photosynthesis in deep water environments where other wavelengths of light do not penetrate as effectively.
Marine algae are photosynthetic. At depths below 200m there is very little sunlight which would make photosynthesis extremely difficult.