The correct option is Protoplasm.
Explanation
Pseudopodia (singular: pseudopodium), meaning "false feet," are temporary projections of the cell membrane and cytoplasm found in amoeboid cells (such as Amoeba and macrophages). They serve two primary functions: locomotion and the ingestion of food (phagocytosis).Analysis of Options:
- Protoplasm is Correct: Pseudopodia are formed by the streaming of protoplasm (specifically the cytoplasm). This process involves the active flow of cytoplasm, driven by the cytoskeleton (actin filaments), and is regulated by changes in the viscosity of the cytoplasm (sol-gel theory). The pressure exerted by this streaming pushes the plasma membrane outward to form the extension.
- Nucleoplasm is Incorrect: Nucleoplasm is the protoplasm contained specifically within the nuclear membrane. It houses the genetic material and does not participate in the formation of external cytoplasmic projections.
- Lysosomes is Incorrect: Lysosomes are membrane-bound organelles containing hydrolytic enzymes responsible for digestion. While they fuse with food vacuoles formed by pseudopodia, they are not the structural components that form the pseudopodia.
- Chromatin is Incorrect: Chromatin refers to the complex of DNA and histone proteins located within the nucleus. It is responsible for genetic regulation and inheritance, not cellular motility.
Key Takeaway:
Pseudopodia are temporary extensions formed by the streaming of protoplasm (cytoplasm), enabling amoeboid cells to move and capture food.