Agar,which is used in the growth of microorganisms and in the preparation of ice creams and jellies,is obtained from:

Identify the alga shown in the figure.

Consider the following statements regarding the major pigments and stored food in the different groups of algae and choose the correct option:
$(i)$ In Chlorophyceae,the stored food material is starch and the major pigments are chlorophyll $-a$ and $d$.
$(ii)$ In Phaeophyceae,laminarin is the stored food and major pigments are chlorophyll $-a$ and $b$.
$(iii)$ In Rhodophyceae,floridean starch is the stored food and the major pigments are chlorophyll $-a, d$ and phycoerythrin.

Which of the following lacks both roots and stomata?

Select the correct option from the given list regarding algal classes and their stored food materials:
$(1)$ Rhodophyceae - Pyrenoids
$(2)$ Phaeophyceae - Laminarin
$(3)$ Bryophytes - Mannitol
$(4)$ Chlorophyceae - Floridean starch

Zygotic meiosis is a characteristic of .......