Succession and Extinction — Unit test Answers

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

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?

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

The image shows a group of fish.

How would an increase in nest sites affect a population of pigeons?

Ground squirrels are found in many areas of the United States. They live in underground burrows and are often attacked by birds of prey, coyotes, and bobcats. Which of the following is a limiting factor for a ground squirrel 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 best describes how an organism’s niche is determined?

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?

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

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

The map shows the distribution of wild boars in the United States (shaded area). Which of these facts about wild boars is best supported by the evidence provided?

Review the picture below.Which would be the most accurate title for this picture?

Which determines carrying capacity?

Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 19902000Lions100,00047,000Cheetahs25,0007,500Zebras750,000450,000Which explanation is best supported by the numbers in the chart?

What would most likely happen if there were no condensation stage in the water cycle?

Which of these is an autotroph?

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

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?

Which statement best compares consumers and decomposers?