Some protozoans have no means of movement. Plasmodium , a sporozoan, causes malaria. Protozoans are able to respond to the environment but is not yet known how they do so. Protozoans move toward moderate light and temperature and food. They avoid bright light and darkness, hot and cold temperatures, and harsh chemicals.
Protozoans digest food within food vacuoles.
This is called intracellular digestion. Lysosomes fuse with the food vacuoles and release digestive enzymes into the food vacuoles. The food is broken down into food molecules. These food molecules diffuse or are actively transported into the cell's cytoplasm. Food vacuoles containing digestive waste move to the plasma membrane and fuse with it.