Assertion: Euglena is a plant due to the presence of chlorophyll.
Reason: Euglena cannot be classified on the basis of two kingdom system.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Euglena is a green coloured, single celled organism which moves like animals. Some taxonomists considered it to be animals. Some taxonomists considered it a plant and included it in the plant kingdom on the basis of chlorophyll while others included it in animal kingdom alongwith the protozoans because of the locomotion by flagella.