The disease known as "Red rust of tea" is caused by a parasite belonging to which of the following groups?

Which of the following statements are applicable to brown algae?
$(I)$ They contain pigments like chlorophyll $a$,chlorophyll $c$,carotenoids,and xanthophylls.
$(II)$ They vary in color from olive green to various shades of brown.
$(III)$ Food is stored as complex carbohydrates,in the form of laminarin or mannitol.
$(IV)$ The cell wall is composed of cellulose and algin.
$(V)$ The cell wall is covered on the outside by a gelatinous coating of algin.

Spermatia are the male gametes of ........

Which of the following pairs consists of unicellular algae?

In which of the following organisms are isogametes produced?

Stomata are not found in