Question

Which of these movements with the help of pseudopodia
(a) Paramecium
(b) Euglena
(c) Amoeba
(d) Plasmodium

Answer 1

Hint: This is a freshwater unicellular organism that was discovered by R. V. Rosenhof in 1755. They belong to the phylum protozoa and are having irregular body shape.

Complete answer:
The amoeba moves with the help of pseudopodia. So it is called pseudopodia locomotion. Pseudopodium is a blunt process of the body and is formed by plasmalemma, hyaline layer plasmagel, and plasmasol. Since these are blunt they are said to be of lobopodia type of pseudopodia. The hyaline layer at the tip of pseudopodia is called the hyaline cap. It takes part in slow amoeboid locomotion and to ingest food materials.

Additional information:
-pseudopodial locomotion appears to be the extension of a neighborhood of the body that anchors itself then pulls the rest of the body forward. Internally, however, the movement is quite different.
-The cytoplasm of amoeba is divided into two parts of the peripheral layer of ectoplasm gel enclosing an inner mass and ectoplasm sol.
-In pseudopodium when endoplasm begins flowing toward this area ( at the beginning of pseudopodia) a part of the ectoplasmic gel is converted to sol, the cell membrane expands, and therefore the pseudopodium is extended forward.
-When the endoplasm of amoeba continues to flow into the pseudopodium, it reaches the tip where it extends laterally and is transformed into a gel. Basically, the movement is one among extending an appendage then emptying the body into the appendage, thereby converting the latter into the previous.
-In paramecium locomotion mainly occurs by the movement of cilia. It can move forward and backward only with its help. While moving forward the cilia strongly move from anterior to posterior.
-In Euglena the waves proceed along the flagellum in a spiral manner and cause the body to rotate once in a second. Thus, in its locomotion, the euglena traces a spiral path about a straight line and moves forward. The movement rate is 3 mm per minute.

So, the correct answer is ‘Amoeba’.

Note:
-Pseudopodia are blunt processes of the body and are formed by plasmalemma, hyaline layer plasmagel, and plasmasol.
-Due to these pseudopodia the body shape of amoeba is irregular.
-Basically in amoeba, the movement is one among extending an appendage then emptying the body into the appendage, thereby converting the latter into the previous.