The matrix around a $Nostoc$ colony is:

$A$ student observes an alga containing chlorophyll $a$,$d$,and phycoerythrin. To which group should this alga belong?

Which of the following statements are true regarding the figure given below?
$(i)$ It shows oogamy and post-fertilization development.
$(ii)$ Male gamete is small and motile.
$(iii)$ Stored food is floridean starch.
$(iv)$ Pectin,cellulose,and polysulphate esters are present in the cell wall.

Select the incorrect statement for algae.

Most algal genera are haplontic,but some of them such as $A$,$B$,and $C$ are haplo-diplontic. Here $A$,$B$,and $C$ refer to:

The basal cell of $Ulothrix$ is known as: