The disease known as "Red Rust of Tea" is caused by $Cephaleuros$ which is a:

The zygote containing $4$ meiospores in $Spirogyra$ is called

The method of asexual reproduction in algae is -

An example of a colonial alga is

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

Algae include unicellular forms like $A$,filamentous forms like $B$,and colonial forms like $C$. Here $A, B$,and $C$ refer to: