Assertion : The photosynthetic, floating protists are collectively called phytoplanktons.
Reason : The free floating holozoic protozons are collectively termed zooplanktons.

Options

A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
B. If both Assertion and Reason are true but Reason is not a correct explantion of the Assertion.
C. If Assertion is ture but the Reason is false.
D. If both Assertion and Reason are false.

Answer

To analyze the question, we need to evaluate both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The photosynthetic, floating protists are collectively called phytoplanktons."
- This statement is true. Phytoplankton are indeed photosynthetic organisms that float in aquatic environments, primarily in the sunlit upper layers of oceans and freshwater bodies.

2. **Understanding the Reason**:
- The reason states that "The free floating holozoic protozoans are collectively termed zooplanktons."
- This statement is also true. Zooplankton refers to the heterotrophic (holozoic) organisms that float in water and feed on other organisms. They do not perform photosynthesis and rely on consuming other organisms for their nutrition.

3. **Evaluating the Relationship**:
- While both the assertion and reason are true, we need to determine if the reason correctly explains the assertion.
- The assertion discusses phytoplankton, which are autotrophic (photosynthetic), while the reason discusses zooplankton, which are heterotrophic. Thus, the reason does not provide a correct explanation for the assertion.

4. **Conclusion**:
- Since both statements are true but the reason does not explain the assertion, the correct option is: "Both Assertion and Reason are True and Reason is not a Correct Explanation of Assertion."

### Final Answer:
Both Assertion and Reason are True and Reason is not a Correct Explanation of Assertion.

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