Question

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

Hyacinth causes change in water quality, reduce amount of DO and increases algae blooms.

Option (iv), (v) and (vii) are correct.

Explanation:

• Water hyacinth is affecting the environment and human health in diverse ways.
• It grows rapidly and changes the water quality by reducing the amount of dissolved oxygen in the water.
• It also changes the pH of the water and causes more acidity.
• Due to less dissolved oxygen, the aquatic life suffers and causes suffocation to fish and other species in the water body.

Answer 2

Option (i.), (iv), (v) and (vii) are correct.

Explanation:

• Water hyacinth is affecting other aquatic plants and the environment of water by blockage of sunlight.
• Water hyacinth is responsible for changing the PH value of water and causes more acidity.
• Water hyacinth grows rapidly and affects the environment.
• Water hyacinth is highly responsible for starving the water of oxygen.

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