Answers. Studying Populations Se~HDO.2.. Name _ Date _ Class _

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1 Answers Name Date Class Populations and Communities Review and Reinforce Ch.. I Studying Populations Se~HDO.2.. Understanding Main Ideas Answer thejollawing questions on Q separate sheet of paper:' 1. Avegetable garden is 12meters long by 7 meters wide. In one square meter, you count two toads. Estimate the population of toads in the garden. 2. What are two ways that the size of a population can increase? What are two ways that the size of a population can decrease? Squirrel Population in a City Park, ~ "5~ ~~ 4 ()] 3 ~!2 ~ TIre graph above shows Iww the size of the squirrel population in a city park changed ouer time. Use the graph to answer questions Over which time period(s) did the squirrel population decrease? 4. Over which time period(s) did the population increase? 5. In which year did the population reach its lowest point? What was the size of the population that year? 6. What causes a population to change in size? 7. Identify three limiting factors that can prevent a population from increasing. Explain how each factor limits a population's size. Building Vocabulary On a separate sheet of paper, define each of these terms in your own words. 8. population density 9. carrying capacity 10. immigration Year P"mon fdu{otion, lnt., publishing es Peerson ~"'~" Holi. All ;gh~ reserved.

2 Name Date Class Populations and Communities Guided Reading and Study Adapting to the Environment (p, 25) Match the term with its definition. Term Definition 1. natural selection a. Characteristic that allows a species to 2. adaptation live successfully in its environment 3. niche b. The way a species makes its living c. Process in which a species becomes better suited to its environment Competition (p. 26) 4. Is the following sentence true or false? The struggle between organisms to survive in a habitat with limited resources is called natural selection. 5. Is the following sentence true or false? Specializing can reduce competition. Predation (pp ) 6. An interaction in which one organism kills and eats another is called. The organism that does the killing is the. The organism that is killed is the 7. Is the following sentence true or false? If a prey population decreases, the population of its predator probably will decrease as well. Symbiosis (pp ) 8. Complete the compare/ contrast table. Types of Symbiotic Relationships Type of Relationship How Species Are Affected Mutualism One species benefits; the other species is unharmed. - One species benefits; the other species is harmed. 9. In a parasitic relationship, the organism that benefits is called a(n) , and the organism it lives on or in is called a(n) Pearson Education, lnc., publishing as Pearson Prentice Holi. All rights reserved. 16

3 AflSW-crS Name Date Class Populations and Communities Review and Reinforce Interactions Among Living Things Understanding Main Ideas Answer the following questions on a separate sheet of paper. (se~.~j 1. How does natural selection produce adaptations in a species? 2. What is an organism's niche? 3. How do adaptations enable organisms to reduce competition for food and other resources? Population oflynx and Hares, "-.; J ~ t:.2 ~ ~ e, ---lynx -Hares The graph above shows how the population sizes of lynx and s'lowshoe hares changed over time. Use the graph to answer Questions When the hare population increased, what happened to the lynx population? Why? 5. How do you think an increase in the lynx population affected the hare population? Why? 6. What other factors could have caused a decrease in the hare population? 7. Predict what happened to the two populations between 1935 and Building Vocabulary Respond to the following items on a separate sheet of paper. 8. Define the terms predation, predator, and prey in your own words. Give an example of a predator-prey relationship. Identify the predator and the prey. 9. Name and describe the three types of symbiotic relationships. 10. Define the term competition. Peorson Edll"~on, lar., publishing DSPeDrson P"n~" Holi. All ngh" ""lved.

4 Name Date Class Populations and Communities Enrich (Sec::tiE)n '3) Analyzing Interactions Among Organisms In 1997, a community decided to get rid of the population of rattlesnakes in the area. The graph below shows what happened to the populations of rattlesnakes, birds, and rodents. (The rodents included animals such as mice, rats, and prairie dogs.) Populations of Rodents, Birds, and Rattlesnakes Year Answer the following questions on a separate sheet of paper. 1. Did the bird populations appear to benefit from the elimination of the rattlesnakes? How do you know? 2. Did the rodent populations appear to benefit from the elimination of the rattlesnakes? How do you know? 3. What was the main source of food for the rattlesnakes? How can you tell? 4. Why do you think the bird populations decreased sharply after the rattlesnakes were eliminated? 5. Do you think it was a good idea for the community to eliminate the rattlesnake population? Explain your answer. Pearson Educafion, Inc., publishing as Pearson Prentice Hall. All rights reserved.

5 ~aine Date Populations and Communities Key Terms Key Terms Cla88 Use the clues to make a list of Key Terms from the chapter. Then find and circle each of the key terms in the hidden-word puzzle. The terms may be written across or down. Clues Organism that is harmed in parasitism Key Terms Struggle between organisms for limited resources in a habitat Organism Organism that does the killing in predation that is killed in predation All the living and nonliving things that interact in an area Place where an organism lives and that provides for its needs Organism that benefits in parasitism Interaction in which one organism kills and eats another Study of how living things interact with each other and their environment An approximation of a number Relationship in which one species benefits and one is unharmed A group of similar organisms that can produce fertile offspring An organism's particular role in an ecosystem Relationship in which at least one species benefits c a p t d a a t 0 n i 8 0 e f g n p h 0 8 t s P In e s t i In a t e 8 i r In c P P c 0 b 1 c y p p e 0 e a h y ill r r n 8 c r e x t g b e e 8 y i a w c a y 0 i d d a s e s d In t c g 0 a a 1 t 8 i P r e y y s t t 1 e n t r e y e p ill t e e y p r 0 s r 0 ill C 0 ill P e t i t i 0 n Pearson Education, Inc., publishing as Pearson Prentice Hall. Allrighls reserved.