What is food vacuole in amoeba Class 7?
What is food vacuole in amoeba Class 7?
The food vacuole or digestive vacuole is a membrane-bound cell organelle (as in an amoeba) associated with a digestive function. They take up the food material by the process of phagocytosis and the ingested food is digested by food vacuole.
How are food vacuoles formed in paramecium?
Paramecia ingest all sorts of small particles, but more digestible than indigestible ones. In forming a food-vacuole, the cilia in the pharynx force fluid with particles in suspension against the membrane over the distal opening of the pharynx, producing a sac, the esophageal sac.
Why do contractile vacuoles occur?
In certain organisms, usually single-celled organisms lacking a cell wall, there exists a special kind of vacuole, called a contractile vacuole. The point of the contractile vacuole is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure.
What will happen if contractile vacuole is absent in amoeba give two reason?
In freshwater amoeba, the contractile vacuole is necessary because freshwater has a lower concentration of solutes than the amoeba’s own internal fluids. So if the contractile vacuole is absent in freshwater amoeba then the cell will fill with excess of water and eventually burst out.
How do amoeba survive?
Some amoebas protect their bodies by covering themselves with sand grains. When water or food is scarce, some amoebas respond by rolling into a ball and secreting a protective body covering called a cyst membrane. They exist in cyst form until conditions are more favorable for survival outside.
How are amoeba adapted to live in water?
Explanation: To regulate osmotic pressure, most freshwater amoebae have a contractile vacuole (CV) that expels excess water from the cell. This organelle is necessary because the surrounding water is hypotonic with respect to the contents of the cell. Water is transferred across the amoeba’s cell membrane by osmosis.
What happens if the food vacuole stops working?
Correspondingly, what would happen if the vacuole stopped working? The cell would have no chance to repair that damage as it would not be able to break down any complex molecules and transform them into what is needed. Moreover, the cell would “starve” as it wouldn’t be able to store all nutrients properly.