Question

Food reserve in Rhodophyta is
A)Floridean starch
B)Mannitol
C)Leucosin
D)All of the above

Answer 1

It is found in glaucophytes and red algae and it is a type of storage polysaccharide or stored form of food in them. It performs as the primary sink for fixed carbon from photosynthesis.it is stored as a form of grains in the cytosol outside the chloroplast.

Complete answer:
Red algae or Rhodophyta – they are the oldest type of eukaryotes. Due to the pigment called chlorophyll phycocyanin and phycoerythrin, they appear red in color. They are mostly found in deep freshwater bodies.
-The food reserve which is found in the Rhodophyta is Floridean starch($\alpha -1,4-glucan$). It is a polysaccharide composed of units of glucose.
-The structure of Floridean starch is similar to the branched amylopectin fraction of green algae and higher plant starch but highly branched than amylopectin
-The Floridean starch stored in a form of grains in the cytosol outside the chloroplast.

Additional Information: Mannitol - it is a naturally occurring polyol that helps to protect organisms against environmental stresses. It is also used as a sweetener as well as medication for decreasing pressure in the eyes and brain.
Leucosin - which is a carbohydrate that occurs in the form of white lumps as a food reserve in many yellow-green algae of class Chrysophyceae.

So, the correct answer is,”floridean starch”.

Note: Red algae are also known as Rhodophytes. Floridean starch is found in rhodophyta, a type of storage glucan found in the grains are granules in the cytoplasm of the cell.
-The polymers used to make a Floridean starch are also referred to as semi amylopectin, which means they lack amylose.
-It is the vital source of carbohydrate products used for storage purposes in floridean starch.
-It is a type of storage glucan and found in the forms of grains or granules in the cell cytoplasm. The polymers that make a Floridean starch are sometimes referred to as semi amylopectin. They lack amylose.
- From photosynthesis, it is usually the primary sink for fixed carbon.