Human Impact on the Environment — Cumulative exam Answers

The image shows a group of fish.

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?

Which human activity is correctly paired with the greenhouse gas that it increases?

A group of sheep run in random directions to confuse a single predator. This is an example of which social behavior?

A trout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. If it continued to grow exponentially, approximately how many trout were there in 1995?

Both photosynthesis and cellular respiration are part of the carbon cycle. Which statement best compares these two processes?

Ash trees are being removed when they show signs of the ash borer, a parasite that affects only ash trees and kills them off. What best explains why the ash trees are being cut down?

The Serengeti plains are part of the African savanna ecosystem and are home to a variety of different species of plants and animals. The Serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. Which type of limiting factors does the seasonal drought in the Serengeti plains affect?

Termites are insects that live in colonies. In a colony, the king and a queen are responsible for reproduction. Workers spend most of their time caring for the other termites and building the nest. Soldiers protect the nest from attacks.The organization of the termite colony is an example of which benefit of social behavior?

Which determines carrying capacity?

An ecosystem has experienced a flood. Which type of plants would you expect to see growing first after the flood?

If the herbivore population in an ecosystem increased, what would most likely happen to the size of the carnivore population?

Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and roads, and to provide lumber for construction and furniture. How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

Which statement describes the relationship between plants, animals, and the carbon cycle?