Select the incorrect statement regarding algae.

  • A
    At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.
  • B
    They increase the level of dissolved oxygen in their immediate environment.
  • C
    They are primary producers in food chains.
  • D
    They are the basis of the food cycles of all aquatic animals.

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The filaments of $Spirogyra$ are:

Which of the following algae has a filamentous structure?

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$A$ research student collected a certain alga and found that its cells contained both chlorophyll $a$ and chlorophyll $d$,as well as phycoerythrin. The alga belongs to:

Consider the following statements:
$I$. They reproduce asexually by non-motile spores and sexually by non-motile gametes.
$II$. In this class,sexual reproduction is oogamous and accompanied by complex post-fertilisation developments.
$III$. The common members are $Polysiphonia$,$Porphyra$,$Gracilaria$ and $Gelidium$.
The above characteristics belong to which class of algae?

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