Question

Arrange the stages of nutrition of amoeba.
a) Ingestion b) Engulfment
c) Digestion
d) Excretion e) Absorption
A. b,a,c,e,d
B. a,d,c,e,d
C. b,a,c,d,e
D. c,d,a,b,e

Answer 1

In Amoeba nutrition occurs through a process called phagocytosis ,where the entire organism engulfs the food it plans to eat. The mode of nutrition in amoeba is known as holozoic nutrition.

Complete answer: Amoebae is an eukaryote consisting of a single cell. The cells of amoebae possess some characteristic features. The cytoplasm and cellular contents are enclosed within a cell membrane. IN amoebae DNA is enclosed in a compartment called the nucleus. Amoebae is an unicellular organism which can alter their shape with pseudopods. Pseudopods are the cytoplasmic extensions by which they move ,it’s also known as pseudopodia or false feet.. This type of movement, called amoeboid movement .This is considered as the most primitive form of locomotion in animals. Each amoeba consists of a small mass of jelly like cytoplasm, that can differentiate into a thin outer plasma membrane. There is a layer of stiff, clear ectoplasm, and a central granular endoplasm. The endoplasm consists of food vacuole, and a granular nucleus, and clear contractile vacuole. The amoeba has no mouth or anus .Food is taken in at any point on the cell surface. During feeding the cytoplasmic extension flows around food particles and forms a vacuole into which enzymes are secreted and digested. The process in which amoeba engulfs the organism is known as phagocytosis. The mode of nutrition in amoebae is known as holozoic nutrition. The intake of nutrition takes place in five stages ,that is engulfment, ingestion, digestion, absorption, excretion.
So, the correct answer is “Option A”.

Note: Amoeba is omnivore by nature, thus feeds on both plants and animals. Amoeba diet includes Bacteria, microscopic plants , nematodes and minute algae etc. As mentioned earlier Amoeba is a unicellular organism, it doesn't have any special organ for the nutrition process. The digested food is absorbed by the surrounding cytoplasm ,the process is known as diffusion