7th Science BM review

A student studying geology wanted to determine the mass and volume of a small rock.  Which set of tools should the student use to determine both properties? Pay attention to your choice!

• ruler and spring scale
• beaker and thermometer
• test tube and tape measuure
• electronic balance

Students are investigating some properties of rocks. They wanted to compare the volumes of the rocks.  Which tool should the students use to accurately measure the volume of each rock? Pay attention to your choice!

• Graduated Cylinder
• Balance
• Microscope
• Ruler

A ____ is used to determine the Force (F) of an object and is measured in Newtons (N).

• triple beam balance
• spring scale
• graduated cylinder
• thermometer

Some students investigated plant growth be growing two sets of the same type of plant. One set was grown indoors and the other set was grown outdoors.  They recorded data in the table shown.  They concluded that the inside plants grew faster because they got better light than the outdoor plants. Why is this conclusion flawed?

• The studewnts measured the plants at different times
• The students should have grown different types of plants
• The growth of the plants in each set was affected by more than one factor
• The outdoor plants grew faster than the indoor plants

Students investigated four different brands of disinfectant wipes. The students rubbed each brand of wipe on a different desk. They collected a bacteria sample from each wiped desk with a cotton swab, then transferred the bacteria to a petri dish. The students also took bacteria from an unwiped desk. After three days, the students compared the amount of bacterial growth in all five petri dishes. Which of these was the experimental control group?

• the sample with the greatest amount of bacterial growth
• the sample from the unwiped desk
• the length of time the bacteria was allowed to grow
• the number of brands of disinfectant wiped tested

A scientist investigates the effect of carbon dioxide on plants height. The scientist grows plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the independent variable in this experiment?

• the amount of carbon dioxide in each container
• the number of plants in each container
• the amount of water provided to the plants
• the height of each plant after a period of time

Students investigated pendulums. The students plotted a graph to show the relationship between different lengths of the string and the time it took the pendulum to complete one full swing. Which conclusion is BEST supported by the graph?

• The time it takes the pendulum to swing back and forth decreases over a period of time
• As the length of the string increases, the pendulum takes longer to swing back and forth
• The time it takes a pendulum to swing back and forth is unpredictable based on the length of the string
• The shorter the string, the fewer times the pendulum swings.

Different types of water pollution and their effects are described in the table shown. What results in BOTH phosphate and nitrate pollution AND thermal (heat) pollution in water? 

• diseases are carried through the water
• levels of oxygen in the water decrease
• growth of algae rapidly increases
• materials contaminate the bodies the birds

A farmer uses one of the following to grow corn.  Which is an adaptive bioengineered product?

• mobile irrigation system
• organic fertilizer
• newly developed pesticide
• drought resistant hybrid corn seed

Which is the best example of an adaptive bioengineered product?

• sugar cane that is processed to make fuel
• mules that are bred from horses and donkeys for farm work
• ladybugs that are raised to eat garden pests
• eyeglasses that are used to crrect near-sighted vision