Chapter 8 Test Study Guide

NOTE: You should also study your notes, vocabulary words, and the textbook.

Name: ______

Class: ______Date: ______

  1. What is the difference between a predator and a parasite? ______
  1. The number of loblolly pines per square mile in Chambers county Alabama would be the loblolly pine’s ______
  1. Which one of the following characteristics best describe a population?

A. Number of individualsB. Color variations among organismsC. Unique adaptationsD. Number of species

  1. The carrying capacity of an environment for a particular species at a particular time is determined by the supply of ______

______

  1. Clumped, random, or even typically describes the ______of a population.
  1. What determines an organisms reproductive potential? Give an example of an organism with a high reproductive potential. ______
  1. Define population density. ______
  1. The acute eyesight of a red tailed hawk is not an example of coevolution. Why? ______

______

  1. The relationship between a Canadian lynx and a snowshoe hare is an example of ______
  1. A species of insect has exponential growth after it is introduced into an area where it has never lived. Which statement best describes exponential growth?
  1. The population increases and then immediately decreasesB. Within a few years the population increases dramatically
  1. The species’ reproductive potential increases over timeD. Each individual mutates within 10 years
  1. Two species using the same food source at different times is an example of indirect ______.
  1. A species’ niche includes that species’ ______, ______, and ______.
  1. The maximum population that the ecosystem can support indefinitely is known as ______.
  1. The interaction between a cheetah and gazelle is ______.
  1. A microscopic organism that lives in the gut of a cow helps break down grass and hay so the cow can use it for food. The organism lives inside the cow. What kind of relationship is this? ______
  1. The relationship between some species of trees and ants can best be described as ______.
  1. Which statement(s) is/are true about parasitism:

A. Parasites immediately kill their hostB. Parasites do not live on or in their hosts’ body

C. Parasites are always animals and never plantsD. Parasites may cause their hosts to become more vulnerable to

predators

  1. Competition for food can occur:

A. Between two populationsB. Among members of the same population

C. Among populations whose niches overlap D. Between animals from two different ecosystems

  1. Which of the following isan/are example(s) of exponential growth?

A. Mold appearing on bread overnightB. Reindeer of the Pribilof Islands after eating most of the lichens

C. A bank account that earns interestD. Rabbit populations after being introduced to Australia

  1. Which of the following is not an example of a population?

A. All trees in a forestB. All plants in a forestC. All loblolly pines in a forestD. All animals in a forest

  1. Which of the following are parasites?

A. A roundworm in a human’s intestinesB. A cow in a pasture

C. A tick on a catD. Mistletoe on a tree

  1. Which of the following would most likely exhibit a random dispersion?

A. Gaggle of geeseB. Loblolly pines in a forest

C. Heard of wild horsesD. Solitary badgers in Scandinavia

  1. Which of the following would most likely cause a large number of density-independent deaths in a population?

A. Mosquitoes in KenyaB. African lions

C. Limited resourcesD. Hurricanes and Tornadoes

  1. What are the three main properties used to describe a population? ______

______

  1. A(n) ______usually kills its prey while a ______usually only weakens its host.
  1. If a mating pair of rabbits find a place to live with plenty of food and no predators, the population of rabbits will probably undergo ______growth.
  1. What is the formula used to calculate a population’s growth rate? ______
  1. How do organisms affect each other if they are in competition? ______

______

  1. List three density dependent factors that will cause a population to decrease. ______

______

  1. A female dog’s niche includes which of the following?

A. The number of puppies the dog has.B. How the dog protects its owner.

C. The neighbor’s enclosed yard.D. Fleas that infest the dog.

  1. Which of the following statements explains why the growth of orchids on the high branches of tropical trees is an example of commensalism?

A. The trees receive nutrients from the orchids.B. The trees are neither benefited nor harmed.

C. The orchids draw nourishment from the trees.D. The orchids keep parasites away.

  1. Name the relationship in which neither species is harmed. ______

Essay/short answer

The cardon and organ-pipe are flowering cacti that depend on bats for pollination. The bats pollinate the cacti as they eat the nectar in cacti’s flowers and spread seeds when they eat the cactus fruit. Studies of the cacti show that they are not producing as much fruit as they could. If was also noted that bats living near these cacti had been driven from their cave homes by local villagers. What is the relationship between the bats and the cacti? How did the reduction in the number of bats affect the cacti?

______