Question

Polyuronic acid and polysulphate esters are characteristic in cell wall of

• A. Brown algae
• B. Red algae
• C. Dinoflagellates
• D. Diatoms

Answer 1

The correct option is B Red algae

The vegetative cell has a cellulosic wall usually covered on the outside by a gelatinous coating of algin. On the cell wall of brown algae, some colloid substances like fucinic acid, alginic acid and fucoidan are present which are known as hydrocolloids.

The cell wall of red algae is complex and made up of cellulose & pectin. The cell wall of red algae is also complicated like blue-green algae. Their cell wall has many different types of substances such as xylan, galactose, polyuronic acid, polysulfate esters.

In dinoflagellates, cell wall has a stiff cellulose plate on the outer surface.
In diatoms, the cell wall is made up of silica (hydrated silicon dioxide) called as frustule. They are the major group of algae, most common Chrysophytes.

Thus, the correct answer is option B.