Which one of the following statements is wrong?

  • A
    Chlorella and Spirulina are used as space food.
  • B
    Mannitol is stored food in Rhodophyceae.
  • C
    Algin and carrageenan are products of algae.
  • D
    Agar-agar is obtained from Gelidium and Gracilaria.

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Which of the following algae is symbiotic and nitrogen-fixing?

The absence of chlorophyll in the lowermost cells of $Ulothrix$ indicates:

The unique character of a $Spirogyra$ vegetative cell is:

Choose the correct pair.

Agar,which is required for the synthesis of ice cream and jelly,is obtained from:

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