In ulothrix, the shape of chloroplast is

a. Star- shaped

b. Cup-shaped

c. Girdle-shaped

d. Diffuse type

Ulothrix belongs to the family Ulotrichaceae. Its cells are almost equal in length and breadth, each containing a distinct nucleus, a central vacuole, and a thin chloroplast. The cells are joined end to end, forming a long, multicellular, unbranched thallus.

In most species, all cells are capable of forming reproductive bodies. Reproduction takes place in three ways:

• Vegetative reproduction by fragmentation.
• Asexual reproduction by motile spores (zoospores) and non-motile resting spores.
• Sexual reproduction by biflagellate gametes.

The plant body is divided into three main regions: basal cell, apical cell, and middle cells. The chloroplast contains two or more pyrenoids, such as in Ulothrix rorida and Ulothrix zonata. Pyrenoids are structures found in many algae, associated with starch storage.

The chloroplast is a band-shaped organelle located along the periphery of the cytoplasm, though its shape can vary by species. As in all plants, the chloroplast converts light energy into chemical energy, enabling photosynthesis.

Correct Answer: Option (C).