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A The phenomenon of soil-less culture of...

A The phenomenon of soil-less culture of plants is called Hydroponics.
R Donnan equilibrium is due to fixed ions in the cells

A

If both As and R are correct and R is correct explanation of As

B

If both As and R are correct but R is not correct explanation of As

C

If As is correct, R is wrong

D

If both As and R are wrong.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Assertion:** - The assertion states that "The phenomenon of soil-less culture of plants is called Hydroponics." - Hydroponics is indeed a method of growing plants without soil, using a nutrient-rich water solution instead. 2. **Evaluating the Assertion:** - Since hydroponics involves growing plants in a liquid medium that provides essential nutrients, the assertion is true. 3. **Understanding the Reason:** - The reason states that "Donnan equilibrium is due to fixed ions in the cells." - Donnan equilibrium refers to the distribution of charged particles (ions) across a semi-permeable membrane, where these ions do not distribute evenly due to the presence of fixed ions. 4. **Evaluating the Reason:** - The reason is also true, as Donnan equilibrium does involve fixed ions influencing the distribution of other ions across a membrane. 5. **Determining the Relationship:** - While both the assertion and reason are true, the reason does not explain the assertion. Hydroponics and Donnan equilibrium are related to different concepts in biology. 6. **Conclusion:** - The correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion. Therefore, the answer is option B. ---
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