Which of the following hydrocolloids is obtained from brown algae?

Sexual reproduction in $Spirogyra$ is morphologically characterised by

Which alga is used by space travellers as a food supplement?

Mannitol is the stored food in $..........$.

$A$: In $Fucus$,the sporophytic phase is limited to the zygote only.
$R$: In $Fucus$,the sporophytic phase is photosynthetic and independent.

In $Chlamydomonas$,the meiosis occurs in: