Question

Ulothrix produces

• A. Isogametes
• B. Anisogametes
• C. Ascospores
• D. Heterogametes

Answer 1

The correct option is A Isogametes

Ulothrix cells produce four to eight zoospores, and each zoospore bears four flagella for a time before settling onto a substrate and undergoing divisions to form a new filament. The cells that give rise to the zoospores are called as sporangia or zoosporangia.

Isogametes are also produced in cells called as gametangia. And each such gamete possesses two flagella rather than four. Gametes from different filaments come together to form zygotes (Ulothrix being heterothallic). The zygotes are thus temporarily four flagellated. When the zygotes germinate, they become either motile or nonmotile spores. The spores, in turn, grow into new filaments. The zygotes have thick, resistant walls, that enable the cells to withstand adverse conditions, such as winter weather.