Question

Presence of aplanospores in Ulothrix is an example of
A) Dead cell
B) Vestigial cell
C) Accessory cell
D) Beginning of division of labour

Answer 1

Hint: The cells of Ulothrix are typically as large as they are tall, and in the cold temperatures of spring and winter they survive.

Complete Answer:
Ulothrix, in the Ulotrichaceae family, is a genus of green algae. Ulothrix is a genus of filamentous algal species that are not branched, commonly present in marine and freshwater. Its cells are typically as large as they are tall, and in the cold temperatures of spring and winter they survive. By a transformed holdfast cell, they become bound to surfaces. Normally, replication is vegetative.
Now, let us find the solution from the options-
- An essential factor in the culture of microalgae and environmental monitoring is the ratio between living and dead cells. Speedy, robust and automated analytical methods are needed to track the growth of microalgae for biotechnological applications and to optimize output strains. Thus option A is not the correct option.
- Since the cells have unique functions, Ulothrix are multicellular and eukaryotic organisms, since the lower cell acts as a holdfast and has no chloroplast, and the apical cell is dome-formed. Thus, option B is not the correct option.
- The body of the plant is composed of unbranched, uniseriate filaments. The filaments' elements are connected end to end. They are barrel-shaped or cylindrical. At its terminal end, the apical cell is quite oval, while the basal cell is elongated. The basal holdfast is also named, which connects the filament to the substratum. Thus, option C is not only the correct option.
- Ulothrix is a genus of filamentous algal species that, through division, reproduces vegetatively. Asexual replication occurs with the aid of non-motile resting spores and zoospores that are aplanospores. The sexual reproduction of biflagellate gametes is liable. Therefore, the existence of aplanospores is an instance of labour division.

Thus, the correct answer is option (D) Beginning of division of labour.

Note: The cell wall is made up of cellulose and propectin and it excludes mucilage. Each cell possesses a parietal chloroplast and a single girdle-like and in each chloroplast there are two or several Pyrenoids.