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Mannitol is the stored food in
A
$Gracilaria$
B
$Chara$
C
$Porphyra$
D
$Fucus$
Detailed Solution
The three classes of algae differ in their stored food.
Phaeophyceae (brown algae): food is stored as complex carbohydrates, laminarin or mannitol. Examples: $Ectocarpus$, $Dictyota$, $Laminaria$, $Sargassum$ and $Fucus$.
Rhodophyceae (red algae): food is stored as floridean starch. $Gracilaria$ and $Porphyra$ are red algae.
Chlorophyceae (green algae): food is stored as starch. $Chara$ is a green alga.
Hence mannitol is the stored food in $Fucus$.
Phaeophyceae (brown algae): food is stored as complex carbohydrates, laminarin or mannitol. Examples: $Ectocarpus$, $Dictyota$, $Laminaria$, $Sargassum$ and $Fucus$.
Rhodophyceae (red algae): food is stored as floridean starch. $Gracilaria$ and $Porphyra$ are red algae.
Chlorophyceae (green algae): food is stored as starch. $Chara$ is a green alga.
Hence mannitol is the stored food in $Fucus$.