The characteristic feature of brown algae is the presence of ..........

Algae attached to stones are called:

Which of the following produces isogamous and non-flagellated gametes?

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

$A$: In $Fucus$,the sporophytic phase is limited to the zygote only.
$R$: In $Fucus$,the sporophytic phase is photosynthetic and independent.

The simplest green plants are