Question

General account of xanthophyceae and bacillariophyceae

Answer 1

Yellow-green algae or the Xanthophyceae(xanthophytes) are an important group of heterokontalgae. Most live in fresh water, but some are found in marine and soil habitats. They vary from single-celledflagellates to simple colonial and filamentous forms. Xanthophyte chloroplasts contain the photosyntheticpigments chlorophyll a, chlorophyll c, β-carotene, and the carotenoid diadinoxanthin.[7] Unlike other heterokonts, their chloroplasts do not containfucoxanthin, which accounts for their lighter colour. Their storage polysaccharide is chrysolaminarin.[7]Xanthophyte cell walls are produced of cellulose andhemicellulose.[7] They appear to be the closest relatives of the brown algae.