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.

a) i , ii, iii, iv, v

b) i, iii, v, vii, iv

c) iii, v, vi, vii

d) iii, iv, v, vi​

Answer 1

Iehdgcrwohuwihuwuoqbrgs c is the answer

Answer:

C

Answer 2

Answer:

(c) iii,v,vi,vii

Explanation: