EVERYDAY SCIENCE

Detailed explanation-1: -Mannitol and laminarin are considered as reserve food material in many brown algae species. These are complex carbohydrates. Mannitol is a sugar alcohol form of mannose, while laminarin is a linear polysaccharide of mannitol-containing -1, 3-linked glucose.

Detailed explanation-2: -Because of their unique evolutionary history and of their habitat, brown algae feature several peculiarities in their metabolism. One of these is the mannitol cycle, which plays a central role in their physiology, as mannitol acts as carbon storage, osmoprotectant, and antioxidant.

Detailed explanation-3: -Solution: Ectocarpus is a brown alga belongs to the class Phaeophyceae. Members of this class have mannitol and laminarin as stored food material.

Detailed explanation-4: -Mannitol is a type of stored food present in Phaeophyceae also known as brown algae.

Detailed explanation-5: -Phaeophyceae: These are commonly known as brown algae. They possess a, c, xanthophylls, and carotenoids. Food is stored in the form of complex carbohydrates, mostly in the laminarin or mannitol form.