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

Options

A. If both Assertion and Reason are true and Reason is correct explaination of Assertion
B. If both Assertion and Reason are true but Reason is not correct explaination of Assertion
C. If Assertion is true but Reason is false .
D. If both Assertion and Reason are false.

Answer

To solve the question regarding the assertion and reason about Euglena, we will break it down step by step:

### Step 1: Analyze the Assertion
- **Assertion**: "Euglena is a plant due to the presence of chlorophyll."
- **Explanation**: Euglena is indeed a single-celled organism that contains chlorophyll, which allows it to perform photosynthesis. This characteristic is typically associated with plants.

### Step 2: Analyze the Reason
- **Reason**: "Euglena cannot be classified on the basis of the two kingdom system."
- **Explanation**: This statement is true. The two-kingdom system classifies organisms strictly as either plants or animals. However, Euglena possesses characteristics of both plants (due to chlorophyll) and animals (due to its motility using flagella), making it difficult to classify it strictly as a plant or an animal.

### Step 3: Determine the Truth Value of Each Statement
- The assertion is **true** because Euglena does contain chlorophyll and can perform photosynthesis.
- The reason is **true** but does not serve as a correct explanation for the assertion because it explains why Euglena cannot be classified as a plant, rather than supporting the assertion that it is a plant.

### Step 4: Conclusion
- Since the assertion is true and the reason is true but does not explain the assertion, the correct answer is that the assertion is true but the reason is false.

### Final Answer
- The correct option is: **Assertion is true but reason is false.**

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