Assertion: Algal blooms occurs in nutrient poor water.
Reason: Algal blooms make water unfit for human consumption but cause enormous growth of fish.

Options

A. If both are true with reason being correct explanation
B. Both are true but reason is not correct explanation
C. assertion is true but reason is wrong
D. both are wrong

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Algal blooms occur in nutrient poor water."
- To evaluate this, we need to know what algal blooms are and their relationship with nutrients in water.

2. **Definition of Algal Blooms:**
- Algal blooms refer to the rapid increase or accumulation of algae in water bodies.
- This phenomenon is typically caused by nutrient enrichment, particularly nitrogen and phosphorus.

3. **Nutrient Enrichment:**
- Algal blooms usually occur in nutrient-rich waters, not in nutrient-poor waters.
- Eutrophication is the process that leads to nutrient enrichment, which supports dense growth of algae.

4. **Evaluating the Reason:**
- The reason states that "Algal blooms make water unfit for human consumption but cause enormous growth of fish."
- While it is true that algal blooms can make water unfit for human consumption due to toxins produced by some algae, the claim that they cause enormous growth of fish is misleading.

5. **Impact of Algal Blooms on Aquatic Life:**
- When algae die, their decomposition consumes oxygen in the water, leading to hypoxic conditions (low oxygen levels).
- This can result in the death of aquatic animals, including fish, rather than promoting their growth.

6. **Conclusion:**
- Since the assertion is incorrect (algal blooms occur in nutrient-rich water) and the reason is also incorrect (they do not promote fish growth), the correct answer is that both statements are wrong.

**Final Answer:**
Both the assertion and the reason are incorrect.

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