Which alga exhibits a haplo-diplontic life cycle?

Carrageenin,a jelly-like substance,is obtained from:

Read the following statements and identify the characters related to the alga shown in the diagram:
$(a)$ It is a member of Chlorophyceae
$(b)$ Food is stored in the form of starch
$(c)$ It is a monoecious plant showing oogonium and antheridium
$(d)$ Food is stored in the form of laminarin or mannitol
$(e)$ It shows dominance of pigments chlorophyll $a, c$ and Fucoxanthin.
Choose the correct answer from the options given below:

Which of the following is an algal parasite?

Select the odd one out.

Which of the following is known as the primitive plant?