'Hypnea indica' and 'Hypnea bullata' are types of :

red seaweeds

The correct answer is Option (4)- red seaweeds

Hypnea indica' and 'Hypnea bullata' are types of red seaweeds.

Red seaweeds belong to the phylum Rhodophyta, which is characterized by the presence of red pigments called phycoerythrins and phycocyanins. These pigments give red seaweeds their characteristic color. 'Hypnea indica' and 'Hypnea bullata' are specific species of red seaweeds within this diverse phylum. Red seaweeds are found in marine environments worldwide and play important ecological roles, such as providing habitat and food for various marine organisms.