Final answer:
Protococcus and Scenedesmus, both types of green algae, have cell walls made of cellulose. Amoeba does not have a cell wall, allowing for its characteristic shape-shifting abilities. Trichonympha has a cell wall that provides a structure within the termite gut. The correct option is 2) scenedesmus
Step-by-step explanation:
To determine which organism has a cell wall, let's look at the options you've provided:
- Protococcus - Protococcus is a type of green algae, part of the group of photosynthesizing eukaryotic organisms characteristically having a cell wall made predominantly of cellulose.
- Scenedesmus - Scenedesmus is also a type of green algae, similar to Protococcus, and has a cell wall made of cellulose.
- Amoeba - Amoebas, such as the species found in the group Amoebozoa, do not have cell walls. They move and feed by extending pseudopodia and are known for their lack of a fixed shape, which is facilitated by the absence of a rigid cell wall.
- Trichonympha - Trichonympha is a genus of symbiotic flagellate protozoa found in the guts of termites, which, unlike many other protozoans, does have a cell wall to offer structure and protection in the termite gut environment.
Considering these characteristics, the correct answer to which one has a cell wall would be both Protococcus (1) and Scenedesmus (2). The correct option is 2) scenedesmus