Question

Red algae are found growing in the great depths of the ocean. This is due to the presence of

• A. cellulose in their cell wall
• B. algin in their cell wall
• C. phycoerythrin in the plastids
• D. chlorophyll in the chloroplast

Answer 1

The correct option is C phycoerythrin in the plastids

Most varieties of algae live near the surface of the water in order to get enough sunlight to live. Red algae contains the pigment phycoerythrin which absorb blue light and reflect red light. Blue light penetrates water to greater depths more than other colors of light. This allows red algae to live at greater depths than other types.