Excessive growth of planktonic algae due to presence of large amounts of nutrients in water causing a distinct colouration of water is known as

Options

A. Biomagnification
B. Algal bloom
C. Eutrophication
D. Green muffler

Answer

To solve the question regarding the excessive growth of planktonic algae due to the presence of large amounts of nutrients in water causing a distinct coloration of water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the excessive growth of planktonic algae in water due to high nutrient levels, which leads to a distinct coloration of the water.

2. **Identifying Key Terms**:
- "Excessive growth of planktonic algae" indicates a rapid increase in algae.
- "Large amounts of nutrients" suggests that the water is enriched with substances like nitrogen and phosphorus.
- "Distinct coloration of water" implies that this growth changes the color of the water, commonly seen as green or brown.

3. **Evaluating Options**:
- **Biomagnification**: This term refers to the increasing concentration of toxins in organisms at each successive level of the food chain. It does not relate to algae growth.
- **Algal Bloom**: This term specifically refers to the rapid increase in algae in water bodies due to nutrient enrichment, leading to color changes in the water.
- **Eutrophication**: While this term describes the process of nutrient enrichment in water bodies, it does not specifically refer to the visible growth of algae.
- **Green Muffler**: This term is unrelated to the context of water and algae; it pertains to noise pollution control.

4. **Selecting the Correct Answer**: Based on the definitions and relevance to the question, the term that best fits the description is **"algal bloom."**

5. **Final Answer**: The excessive growth of planktonic algae due to the presence of large amounts of nutrients in water causing a distinct coloration of water is known as **algal bloom**.