By the process of phagocytosis.by using pseudopodia.
The mode of nutrition in amoeba is holozoic. When the amoeba comes in contact with food particles,it sends out pseudopodia which engulfs the prey .A food vacuole is formed in which the ingested food is digested.After digested the ingested food is ejected after the food vacuole moves to the end.
nutrition in amoeba involves 5 steps
amoeba has tiny finger like projections on its outer surface known as pseudophodia. when a particle of food comes near it holds the prtcle and it takes it inside the nicleus where the particle is broken down into simpler substances. thus it engulf the particle
In amoeba holozoic nutrition takes place.It can be explained as follows:
1-ingestion:amoeba first ingest the food by cup making shape of pseudopodia.this process is known as phagocytosis.the food particle enters in amoeba in the form of contractile vacuole.
2-digestion:the lysosomic enzymes of amoeba acts on contractile vacuole and break bown the food particle into fine particles.
3-absorption:the fine particles are directly absorbed by cytoplasm of amoeba.
4-assimilation:the absorbed food particles oxidised to give energy which is directly used for the growth of amoeba.
5-excretion:when some amount of waste is collected in amoeba,that waste is excreted by exocytosis at the time when collection of waste is near cell membrane
In amoeba mode of nutrition is holozoic and the process is called phagocytosis which takes place with the help of psedopodia
nutritiontakes place in 5 steps
1 ingestion = Amoeba has no mouth for ingestion of food .it ingests foodusing psedopodia.when food comes near amoeba amoeba forms finger like projections called psedopodia around it through which food is engulfed in.
2digestion =Amoeba forms food vacule which act as temporary stomach as amoeda donot have stomach.digestion of food takes place in it
3absorption=digested food gets absorbed directly in cytoplasm by the process of diffusion
4assimilation=absorbed food gets utilized comletely in this process
5egestion=amoeba has no fixed place for excreting waste food so excretion takes place in any part of amoeba
Nutrition in Amoeba
Nutrition in amoeba is holozoic. Thus, solid food particles are ingested which are then acted upon by enzymes and digested. It is an omnivore, feeding on both plants and animals. Its diet includes bacteria, microscopic plants like the diatoms, minute algae, microscopic animals like other protozoa, nematodes and even dead organic matter.
Since it is a unicellular organism, amoeba does not have any specialised structure or organ for the process of nutrition. It takes place through the general body surface with the help of pseudopodia.
Mechanism of Nutrition
The food is ingested at the point where it comes in touch with the cell surface with the help of pseudopodia. Pseudopodia engulf the food into the cytoplasm. The process of ingestion takes about two minutes.
Digestion in Amoeba
Digestion in amoeba is intracellular taking place within the cell. The food taken in remains in a food vacuole or gastric vacuole formed by the cell membrane and small part of the cytoplasm. The vacuoles are transported deeper into the cells by cytoplasmic movements. Here they fuse with lysosomes that contain enzymes. Two enzymes amylase and proteinase have been reported. Thus, amoeba can digest sugars, cellulose and proteins. Fats, however, remain undigested.
The contents of the vacuole become lighter and the outline of the vacuole becomes indefinite indicating that the digestion is complete.
Since the food on digestion is converted into liquid diffusible form, it is readily absorbed by the cytoplasm. The vacuole becomes progressively smaller as the food is absorbed by diffusion.
All the parts of the cell get the nutrients by the cyclic movement of the cytoplasm called the cyclosis. These nutrients are used to build new protoplasm. In this manner the food is assimilated.
The egestion takes place by exocytosis. There is no particular point from which the egestion takes place. As the amoeba moves forward, the undigested matter is shifted to the back and eliminated as food pellets through a temporary opening formed at any nearest point on the plasmalemma.
AMOEBA OBTAIN ITS FOOD BY A PROCESS CALLED ENDOCYTOIS
AMOEBA IS AN ORANGNISM MADE UP OF SINGLE CELL
IT USAALLY FOUND IN PONDS AND DITCHES
amoeba is a unicelliar that engulfs tiny particles of food by throwing its false feet called pseudopodia.
the pseudopodia join together to form a small cavity called food vacuole.the food inside the vacuole is degested using secrete juices.it is absorbed and assimilated there to provide energy and to perform other other funtions