In $Spirogyra$,sometimes the gametes behave directly as zygospores without fusion. Such reproductive bodies are called

The most advanced group of algae is........

Which of the following are useful for curing goitre?

Select the wrong statement.

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.

State the location and composition of pyrenoids.