Q. Which one of the following environmental conditions promotes rapid growth of water hyacinth?
Answer: A
Notes:
Explanation – Water hyacinth (Eichhornia crassipes) thrives in nutrient-rich water, which provides the nitrogen and phosphorus necessary for its rapid growth. Water hyacinth is a free-floating, perennial aquatic plant known for its rapid growth and invasive nature. It is considered one of the most problematic aquatic weeds globally, causing significant ecological, economic, and social challenges.
Source: The Hindu

