7th Grade Sem 2 Review-EX Credit Code

This variable in an experiment is the one being tested

• dependent variable

• independent variable

Experiment: How does watching TV during studying affect a student’s test grades?

The students grades are the ___________ variable.

• independent
• dependent

The dependent variable is the one

• you measure.

• you test.

You can have more than one independent variable in a controlled experiment.

• True
• False

The more times that an experiment is repeated and the same results obtained, the more likely the results are _________.

• false

• valid

The graph below shows the population of a group of rabbits in a restricted area studied over a period of 5 years.

Which statement might explain why the population levels off as shown in the graph?

• Predators were introduced into the area.

• The resources in the area ran out.

• Competition for resources limits the rabbit population.

• Rabbits eventually left the restricted area.

The figure shows a prairie dog ecosystem.

At which level(s) above would competition take place ?

• levels 2, 3 & 4

• only level 4

• Level 3 & 4

• only level 1

Groups of different organisms living in the same ecosystem

• Ecosystem

• Population

• Community

• Environment

A species of organisms living in the same area.

• Community

• Organism

• Population

• Environment

The area in which an organism is living

• Ecosystem

• Environment

• Population

• All Biotic factors