Which one of the following statements is wrong?

  • A
    Algae increase the level of dissolved oxygen in the immediate environment.
  • B
    Algin is obtained from red algae,and carrageenan from brown algae.
  • C
    Agar-agar is obtained from Gelidium and Gracilaria.
  • D
    Laminaria and Sargassum are used as food.

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Match the following columns:
Column-$I$Column-$II$
$A$. Blue-green algae$i$. Spirogyra
$B$. Unicellular algae$ii$. Nostoc
$C$. Filamentous algae$iii$. Volvox
$D$. Colonial algae$iv$. Chlamydomonas

The algae used in space research is

Pyrenoids are the centre of formation of

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