Science TAKS

2009-2010

Objective 3

• What is it?

• What do I study?

• How many questions?

Objective 3

• Interdependence of organisms and their environment

• In other words, ecology which is the study of living things and their interaction with the environment.

• There are eight questions on the test.

Objective 3

• How does using killed or weakened bacteria in• an immunization help the body prevent• infections?• F Antibodies are formed that fight those• types of bacteria.• G The body develops a fever that kills• beneficial bacteria.• H Bacterial reproductive cycles are• disrupted.• J Bacteria-fighting viruses are activated

Objective 3

According to this phylogenetic tree, whichorganism is most closely related toOrganism V?A QB UC WD X

Objective 3

At one time large herds of bison roamed across the Great Plains. Brown-headed cowbirds often followedthe bison, capturing and eating insects that scattered as the bison walked through the grasses. Thisrelationship between the bison and the cowbird was —F predatoryG competitiveH commensalJ parasitic

Objective 3

• Some plants have a hard waxy coating on• their leaves that helps prevent water loss. In• which environment do these plants most likely• grow?• A Desert• B Marine• C Grassland• D Rain forest

Objective 3

A food web is shown above. If the rabbitpopulation increases, which of the following ismost likely to happen soon afterward?A The deer population will increase.B The plant population will decrease.C Different birds will move into the area.D The insect population will be eliminated