The filaments of $Spirogyra$ are:

Which alga exhibits a diplontic life cycle?

Which structure of $Spirogyra$ is flagellated?

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.

Which of the following algae shows a heterotrichous habit?

Assertion $(A)$: In algae,an embryo is formed from the zygote after fertilization.
Reason $(R)$: Algae reproduce sexually through conjugation.