In five kingdom classification, Euglena is placed in
A. Monera
B. Protista
C. Fungi
D. Animation

Hint:Euglena is a single-celled microscopic algae that is worldwide in habitual. Euglena belongs to the class Euglenoidea. They are found in freshwater as well as in salt water.

Complete answer:
In five kingdom classification, Euglena is placed in Protista. The five kingdom system of classification was proposed by R.H. Whittaker in 1969. The five kingdoms proposed are- Monera, Protista, Fungi, Plantae and Animalia.
(1) Monera: Monera include a group of unicellular prokaryotic organisms. The nuclear material is not enclosed in a nuclear membrane so it is called prokaryotic. Ex- bacteria.
(2) Protista: Protista include eukaryotic organisms that have flagella in their structure. The cells of the protist organism are nucleated. Ex- euglena, algae, amoeba etc.
(3) Fungi: These are eukaryotic organisms that lack chlorophyll. They place an important role in the environment as they decompose the material and recycle it. The cell walls are made of chitin.
(4) Plantae: Plantae are multicellular eukaryotic organisms. They contain chloroplast in their structure and so can undergo the process of photosynthesis.
(5) Animalia: These are multi celled eukaryotic organisms that lack Flagella in their structure. Euglena process chloroplast and so they can prepare food material. These are partially autotrophic.

Therefore, the correct answer is option (B) Protista.

Note:Euglena lacks a cell wall but in low moisture conditions and in scarcity of food, Euglena forms a protective wall around itself and stays dormant or stays at the resting conditions until adverse environmental conditions improve.