with reference to threat to our biodiversity.What is common about Eichhornia, Lantana, and Parthenium

All the three plants are species of flowering plants .They exhibit harmful effects to biodiversity,  Lantana, excretes chemicals which reduce the growth of surrounding plants by inhibiting germination and root elongation also it forms dense thickets which reduce the production of farm land. Eichhornia, also known as water hyacinth grows vigorously and can double their population in two weeks. It can cover lakes and ponds entirely and ultimately affects water flow, blocks sunlight from reaching native aquatic plants, often killing fish whereas, Parthenium releases toxin parthenin that causes dermatitis and respiratory malfunction in humans , cattle as well as in domestic animals.

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