Which one of the following is an example of a chlorophyllous thallophyte?

Which group of plants was the first to exist on Earth?

Assertion : Red algae contribute to the production of coral reefs.
Reason : Some red algae secrete and deposit calcium carbonate over their walls.

Algae include unicellular forms like $A$,filamentous forms like $B$,and colonial forms like $C$. Here $A, B$,and $C$ refer to:

Red rust of tea is caused by

Isogamous condition with non-flagellated gametes is found in: