Question

Besides the flagellar movement, euglenoids can also perform the special movement by membrane undulation, called “euglenoid movement”. Euglenoids are included in
A. Monera
B. Metazoa.
C. Metaphyta
D. Protista.

Answer 1

Hint:- Euglena is a unicellular eukaryotic organism. It comprises chloroplast. Thus they are capable of doing photosynthesis. The asexual reproduction is found in the Euglena. The process by which reproduction of Euglena happens , known as binary fission. Euglena can be found in both freshwater and marine water.

Complete answer:
The flagella are considered as the locomotory organ for the Euglena. Sometimes this flagellum is modified into an undulating membrane by folding back along the organism’s body. The movement of Euglena done with the help of an undulating membrane which involves the movement of protoplasm is known as the euglenoid movement.
In the given options,
The organism which belongs to the kingdom monera is a unicellular prokaryotic organism. The organisms lack membrane-enclosed true nucleolus. Instead of the true nucleolus, it comprises a nucleoid region within the cytoplasm. These organisms are capable of breaking down the dead matter and food within the digestive tract. These organisms include a rigid cell wall thus, no euglenoid movement is found. So, it is not the correct answer.
Metazoa is also known as an animal. These organisms include more than one cell thus these are multicellular organisms. Metazoan comprises eukaryotic cellular organization which means they possess membrane-bound organelles like the nucleus, mitochondria, Golgi body, lysosome, etc. These organisms do not include the euglenoid movement. So, it is not the correct answer.
The organisms belonging to metaphyta are multicellular. They are autotrophs (capable of synthesizing the food). It comprises a cell wall. Thus there is no euglenoid movement. So, it is the wrong option.
Kingdom Protista comprises both unicellular and multicellular organisms. These are eukaryotes. Protists can be both flagellated and non-flagellated organisms. Flagellated protists involve terminal flagellum undulation and movement of protoplasm for locomotion. This movement resembles the euglenoid movement.


So, the correct answer is option D. Protista.

Note:- Euglena comprises a long thin tail-like flagellum that is projected from the cytostome via cytopharynx. The undulating membrane is the cytoplasmic extension that is found in the association of flagella. This structure resembles the fin and is responsible for enhancing the organism's motility.