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American water plant that has become a troublesome water weed in India is

1. Cyperus rotundus
2. Eichhornia crassipes
3. Trapa latifolia
4. Trapa bispinosa

Correct answer: Eichhornia crassipes

Solution

Eichhornia crassipes is water hyacinth, an American aquatic plant that spread aggressively in India. Its rapid growth and floating mats make it a troublesome weed in ponds, lakes, and canals.

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