👤 Student Information
📚 What is Water Hyacinth?
Water hyacinth (Eichhornia crassipes) is an invasive aquatic plant that has become one of the world's most problematic weeds. Originally from South America, this floating plant has spread to waterways across Africa, Asia, and North America, causing significant environmental and economic damage. Despite its beautiful purple flowers, water hyacinth can completely cover water surfaces, blocking sunlight and depleting oxygen levels.
🎧 Listen to the Audio Lesson
🔑 Key Learning Points
- Origin: Water hyacinth originally comes from South America
- Problems: Blocks waterways, affects fishing, damages ecosystems
- Solutions: Mechanical removal, biological control, alternative uses
- Benefits: Can be used for fertilizer, animal feed, and biofuel
Choose TWO letters, A-E
Which two problems are caused by water hyacinth?
23. Where was water hyacinth originally from?
24. What is the primary cause of the decrease in nutrients from the soil?
25. When will the biological solution bring risks to the environment?
26. What does John say about the mechanical solution?
What is the benefit of cut-down water hyacinth to each of the following aspects?
Choose Four answers from the box and write the correct letter, A-F next to Questions 27-30
Benefits of cut-down water hyacinth:
A. Can reduce the effect of global warming
B. Can be used as an alternative energy resource
C. Can make quick profits
D. Can produce materials for plants to grow in
E. Can be good for human health
F. Can produce fertilizer
Submitting your answers to the database...