An organism that is made up of only one cell is known as unicellular. There are many different kinds of unicellular organisms. They are microscopic, and you need a microscope to see them.
Some unicellular organisms are: amoeba, algae, euglena, cyclops, malaria parasite, plankton, protozoa, sporozoa and heliozoa.
Answer
Turgor potential also known as pressure potential develop in plant cell when water enter to cell through process of osmosis and vacoul is filled with water which exert pressure on cell wall from inside.
Role of pressure potential
It is one of the most important property of plant cell that help in maintain the proper shape of ell and keep plant straight or rigid. It also help in keeping water body that is required for plant under stress condition. Similarly primary cell wall become enlarge and grow in length due to turgor pressure.
When a cell is plasmolysed mean water move out from cell then it cause welting and bending of plant body. So it is pressure potential that keep away plants from such condition.
When water freezes, its volume increases by 9%
Plant cells contain chloroplast which contain a light trapping pigment chlorophyll. Inside the chloroplast are organelles that functions the work of the chloroplasts. These are stroma, chlorophyll, thylakoid. Stroma is the aqueous space that surrounds the chlorophyll containing membrane of the chloroplast.
C; to stop pathogens with light harming the host cell