Question: what is the difference between red algae and green algae?
Answer: Red algae contain chlorophyll a and d while green algae contain chlorophyll a and b. Red algae appear red in colour due to pigment r-phycoerythrin while green algae appear green in colour due to chlorophyll b. The food reserve in red algae is floridean starch while the food reserve in green algae is starch.