Question

Assertion: Euglena is a plant due to the presence of chlorophyll
Reason: Euglena cannot be classified on the basis of a two-kingdom system of classification

• A. Assertion is false but reason is true
• B. Assertion is true but reason is false
• C. Both assertion and reason are true and reason is the correct explanation of assertion
• D. Both assertion and reason are true but reason is not the correct explanation of assertion

Answer 1

The correct option is D Both assertion and reason are true but reason is not the correct explanation of assertion

Euglena is a unicellular organism that belongs to the kingdom of Protista.

Euglena exhibits characteristic features of both plants and animals and hence is considered as the connecting link between plants and animals.

Characteristics of plants:

They have photosynthetic pigments (chlorophyll) and in the presence of sunlight exhibit an autotrophic mode of nutrition

Characteristics of animals:

Absence of cell wall
Flagella for locomotion
Presence of contractile vacuole
Heterotrophic mode of nutrition in the absence of light

Since Euglena has features of both animals and plants, early taxonomists, working within the Linnaean two-kingdom system of classification, found it difficult to classify.

Hence, both assertion and reason are true but reason is not the correct explanation of the assertion.