Green lacewings are used to control aphids, which are pests of many crops. A population of 1000 green lacewings is
released into a farmer's field. The graph shows the change in the population over time.
What is the most likely explanation for the approximately constant population of the lacewings after the eighth year?
A. The lacewings had eaten all of the aphids in the field.
a
B. The lacewing population had reached the carrying capacity of the field.
C. New predators of lacewings had arrived in the field.
O
D. The birthrate of lacewings had increased, while the death rate remained constant.

The best explanation for the approximately constant population of the lacewings after the eighth year is - B. The lacewing population had reached the carrying capacity of the field.

Carrying capacity is the maximum number or total frequency of individuals of a population that can sustainably live in a habitat. It can be calculated or identified by an equal rate of birth and death in the population.

It depends on the biotic and abiotic factors and resources such as food, water, space, and others.
In this given case, The graph indicates that lacewings after the eighth year reach to its maximum number that can hold by the habitat as the population line in the graph becomes horizontal.
The horizontal line in a population graph is present when there is the same number of death and birth of individuals in the population.

Locate the point on the graph where the population line is horizontal to get carrying capacity on a graph

Thus, the correct choice is - option B.

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