The sexual reproduction in $Spirogyra$ is:

Select the incorrect statement for algae.

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.

Hydrocolloid carrageen is obtained from:

Red rust of tea is caused by

The filament of $Mastigocladus$ $laminosus$ is