Question

Consider this food web. It is rich with animal species that fill a variety of niches within the ecosystem. Imagine that a local farmer has sprayed the area with insecticide. Predict how this might impact the food web and the roles each organism plays within it.
A) The entire food web would be impacted. The base of the food web, the herbivores, would be eliminated. The food web would collapse without this niche being filled.
B) Although the farmer's spray would wipe out the insects, the other herbivores, rabbits, squirrels, mice and birds, would take over the empty niches and the food web would continue with very little change.
C) One section of the food web would be greatly impacted: the section containing the insects and insect-eating animals. Without insects and possibly spiders, there would be no food for the toads and insectivorous birds.
D) One section of the food web would be greatly impacted: the section contains the insects and insect-eating animals. Without insects and possibly spiders, there would be no food for the toads and birds including the hawks and owls.
35)
Green sea turtles eat sea grass that grows on the sea floor. Seagrass, a foundation species, provides an important breeding ground for fish and other marine organisms. A conservation program for the green sea turtles plans to introduce more turtles into an ecosystem. What could be the immediate effect of this on the ecosystem?
A) More species of fish would migrate to the region.
B) The new turtles would drive out the existing population.
C) The region would witness a spurt in the growth of sea grass.
D) There would be a decrease in the population of marine organisms.

Answer 1

The first one Is C. One section of the food web would be greatly impacted: the section containing the insects and insect-eating animals. Without insects and possibly spiders, there would be no food for the toads and insectivorous birds.

The second one would be D. There would be a decrease in the population of marine organisms.

Answer 2

Answer:

C.

Explanation:

One section of the food web would be greatly impacted: the section containing the insects and insect-eating animals. Without insects and possibly spiders, there would be no food for the toads and insectivorous birds. One area would not be affected by the spray: the area with herbivores that are not insects.