Question

Mannitol is the stored food in
A) Gracilaria
B) Chara
C) Porphyra
D) Fucus

Answer 1

Algaes are generally autotrophic or heterotrophic in nature. They have the ability to store food in their body. Thus stored food is seen in the form of search , oils, and laminnarian. Mannitol is a type of food stored in the brown algae.

Complete answer:
Algae have the ability to store food to produce energy when they need it. Mannitol is generally the form of carbohydrate stored as in the form of food in certain algae. The members of the brown algae generally store their food as mannitol. Mannitol usually represents the end product of these types of algae. And these are generally the main form of carbon. They are formed by the reduction of fructose 6–phosphate.
Mannitol has other important functions as osmoprotectant and as well as antioxidants. Fucus are generally a type of brown algae which are found in the seashore. They store their food in the form of laminarin, mannitol and oil.
Chara is usually a type of multicellular green algae which are found in the freshwater sources and generally grows attached to the bottom. They store their food in the form of starch and oil.
Porphyra is a type of cold water seaweed algae which generally grows in cold and shallow sea water. They are usually a type of red algae which belongs to the class of rhodophyceae. This type of algae stores food in the form of floridean starch.
Gracilaria is also a type of red algae which are very important for its economic importance. They store food in the form of floridean starch. They also belong to the class rhodophyceae.

Therefore the correct answer is option (D) fucus.

Note: Algae can store food in their body for further requirements. The primary byproduct of stored food in algae is polysaccharides. These are generally found in different types of algae.