Increase in concentration of the toxicant at successive trophic levels, cause :-

Options

A. Biomagnification
B. Eutrophication
C. Accelerated Eutrophication
D. Algal Bloom

Answer

### Step-by-Step Text Solution:

1. **Understanding the Concept**: The question asks about the increase in concentration of toxicants at successive trophic levels. This phenomenon is primarily known as biomagnification.

2. **Definition of Biomagnification**: Biomagnification refers to the process where the concentration of toxic substances increases as they move up the food chain. This occurs because organisms at higher trophic levels consume multiple organisms from lower levels, leading to a higher accumulation of the toxicant.

3. **Examples of Toxicants**: Common examples of toxicants that undergo biomagnification include DDT (a pesticide) and mercury (a heavy metal). These substances are not easily broken down and can accumulate in the fatty tissues of organisms.

4. **Trophic Levels**: In a typical food chain, the first trophic level consists of producers (like plants), the second level consists of herbivores, and the third and higher levels consist of carnivores. As you move from producers to herbivores to carnivores, the concentration of toxicants increases.

5. **Other Related Terms**: The question also mentions terms like eutrophication, accelerated eutrophication, and algal bloom.
- **Eutrophication** is the natural aging process of a lake due to nutrient enrichment, mainly from nitrogen and phosphorus.
- **Accelerated Eutrophication** refers to the rapid increase in nutrients due to human activities, leading to excessive growth of algae.
- **Algal Bloom** is the rapid increase in algae due to high nutrient levels, which can deplete oxygen in water and harm aquatic life.

6. **Conclusion**: Given the definitions and examples, the correct answer to the question regarding the increase in concentration of toxicants at successive trophic levels is **biomagnification**.