When an alien species (plant or animal) that does not belong to an ecosystem is introduced, it spreads and competes with the native plants for space and nutrients and becomes problematic in the absence of natural enemies. These intruders are called invasive alien species.
What are the ill effects of an invasive species like water hyacinth?
i. Blockage of sunlight from reaching native aquatic plants. ii. Starving the water of carbon dioxide iii. Domination and phasing out of fish and other native species. iv. Change in the water quality with respect to the dissolved oxygen and the water pH due to release of CO2 . v. Starving the water of oxygen. vi. Desilting of the water body vii. An increase in algae blooms, mosquito infestation due to dense matting and decreased water flow.
a) i , ii, iii, iv, v b) i, iii, v, vii, iv c) iii, v, vi, vii d) iii, iv, v, vi
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Reason(s) Why it has Become Established: The Water Hyacinth has special adaptations to allow it to grow and spread rapidly in freshwater. They can withstand extremes of nutrient supply, pH level, temperature, and even grow in toxic water.
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