Final answer:
The 'funnel-like depression' on the pellicle is referred to as the cystome or cytostome, which is used by protozoans to ingest food. The pellicle itself is supported by protein filaments and may exhibit parallel striations.
Step-by-step explanation:
The term 'funnel-like depression' on a pellicle typically refers to the cystome or cytostome, which is the region that many protozoans use to ingest food. The pellicle itself provides structural support to these microorganisms which lack a cell wall, like a giant amoeba. Instead of a rigid cell wall, the membrane of these organisms is reinforced with protein filaments, forming the pellicle that may also show parallel striations on the outside.
This structure allows for flexibility and a certain degree of protection. When discussing something related to densities and separations, such as the image described for Figure 1.12.1 of a Separatory Funnel, it is crucial to not confuse the terminology. In this case, the funnel is a laboratory tool used to separate liquids with different densities, and it does not relate directly to the biological structure of a pellicle.