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The following species of plant is consid...

The following species of plant is considered as the world's most problematic aquatic weed is

A

Lantana

B

Eichhornia

C

Parthenium (carrot grass)

D

Brown algae

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Problematic Aquatic Weed**: The question asks for the world's most problematic aquatic weed. We need to evaluate the provided options to determine which one fits this description. 2. **Evaluate Each Option**: - **Option 1: Lantana**: This plant is known for its toxicity and antimicrobial properties, but it is not primarily an aquatic weed. Therefore, it is not the correct answer. - **Option 2: Echornia (Water Hyacinth)**: This plant is native to tropical and subtropical regions and is known for its rapid growth. It can double its population in just two weeks, leading to the choking of water bodies and threatening aquatic life. This makes it a strong candidate for the most problematic aquatic weed. - **Option 3: Parthenium (Carrot Grass)**: While this plant is toxic and causes health issues, it is not primarily an aquatic weed. Thus, it is not the correct answer. - **Option 4: Brown Algae**: Although brown algae can cause algal blooms under certain conditions, it is not classified as a problematic aquatic weed in the same sense as water hyacinth. 3. **Conclusion**: After evaluating all the options, the most problematic aquatic weed is **Echornia (Water Hyacinth)**. **Final Answer**: The world's most problematic aquatic weed is **Echornia (Water Hyacinth)**. ---
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