Question

Isogametes of Ulothrix are
A. Biflagellate
B. Multiflagellate
C. Quadriciliate
D. Quadriflagellate

Answer 1

Hint: Ulothrix is a non-branching filamentous green algae. It is generally found in marine and freshwater. The mode of reproduction of Ulothrix is by both asexual method and sexual method. They produce two flagella gametes.

Complete answer: Ulothrix is a green alga belonging to the phylum of Chlorophyta. Ulothrix belongs to the family Ulotrichaceae. The green colour of the algae is due to the presence of a green colour pigment called chlorophyll. The cells of Ulothrix are broad enough as they are long in size and they thrive in low temperature during winter and spring. Each cell of Ulothrix consists of a central vacuole, distinct nuclei, and a large thin chloroplast. They get attached to the surfaces by a modified holdfast cell. They are eukaryotic organisms with each cell having specific functions to perform. The body structure of the Ulothrix is unbranched and consists of uniseriate filaments. Reproduction in Ulothrix occurs by means of vegetative, asexual and sexual methods. Fragmentation and akinete formation are the common methods of vegetative reproduction. Ulothrix sexually reproduces by biflagellate gametes. The isogametes of Ulothrix are biflagellate. Their size is even smaller than micro zoospores.
Hence, option A is the correct answer.

Note: The most common method of reproduction in Ulothrix is vegetative method. The non-motile spores called aplanospores and motile quadriflagellate spores called zoospores are involved in the asexual reproduction of Ulothrix. In most species of Ulothrix, all the cells of the body can form reproductive bodies.