Final answer:
The cytoskeleton of plant cells is composed mainly of microfilaments and microtubules. Microfilaments are thin actin fibers that function in cellular movement and cell support. Microtubules are thick fibers involved in chromosome movements during cell division and organelle movement inside cells.
Step-by-step explanation:
The cytoskeleton of plant cells is composed mainly of microfilaments and microtubules. Microfilaments, also known as actin filaments, are the thinnest of the cytoskeletal fibers and are made of actin protein. They function in cellular movement, cell support, and the pinching off of daughter cells after mitosis. Microtubules, on the other hand, are the thickest of the cytoskeletal fibers and are involved in chromosome movements during cell division, organelle movement inside cells, and cilia- and flagella-based motility of whole cells.