A plant "X” is explained as follows:
The plant body is called thallus. The cells are typically eukaryotic with a prominent nucleus and many plastids. The cell wall is composed of cellulose and pectin. Along with chlorophyll another pigment called xanthophylls is present.Out of the given names "X” can be-
Sargassum
In multicellular algae the plant body is called thallus. The cells are typically eukaryotic, with a prominent nucleus and many plastids. The cell wall is composed of cellulose and pectin. In green algae, green pigment chlorophyll is in maximum quantity. Example: Spirogyra and Ulothrix. In red algae, in addition to chlorophyll, a red pigment called phycoerythrin is present. Example: Batrachospermumand Polysiphonia. In brown algae, in addition to chlorophyll, xanthophyll is present which gives brown colour to thallus. Example: Sargassumand Ectocarpus.