Question

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.​

Answer 1

Answer:

The correct options are 3,4,5 and 6

Explanation:

Among the various options given regarding the negative impact of water hyacinth (Eichhornia crassipes) on ecological and marine life, the correct options are listed below;

Domination and phasing out of fish and other native species.

Change in the water quality with respect to the dissolved oxygen and the water pH due to release of CO2 .

Starving the water of oxygen.

Desilting of the water body

Answer 2

The ill effects of an invasive species like water hyacinth are b) i, iii, iv, v, vii.

Explanation:

• Invasive species are not native organisms to a particular area. They shift from one place to another and cause harm to the native organisms.
• Water hyacinth is an aquatic plant which is native to Amazon basin. They produce attractive flowers with feathery roots floating freely.
• They also affect the environmental and economic trait of a place. These organisms adapt to new places easily.
• These plants grow up to 1 meter which deprives aquatic plants and animals from sunlight. These organisms always out compete the native organisms.
• They absorb all the oxygen and increase the mosquitoes.