ACT Science Practice

According to the results of the studies, from which of the 5 leachates was the greatest percent of DOC absorbed by CM1, CM2, and CM3, respectively?

• CM1 CM2 CM3

  maple maple rhododendron

• CM1 CM2 CM3

  oak pine magnolia

• CM1 CM2 CM3

  pine magnolia rhododendron

• CM1 CM2 CM3

  pine magnolia magnolia

According to the results of  $Study\ 3$ , the percent of leachate DOC absorbed by CM3, averaged across the 5 types of leaves, is closest to which of the following? 

•  $10\%$  

•  $20\%$  

•  $30\%$  

•  $40\%$  

Tags

NGSS.MS-LS2-1

Is the statement "CM2 absorbed a greater percent of the DOC in the maple leachate than did CM3" supported by the results of  $Studies\ 2\ \&\ 3$  ?

• Yes; CM2 absorbed 35% of the leachate DOC, whereas CM3 absorbed 7%. 

• Yes; CM2 absorbed 55% of the leachate DOC, whereas CM3 absorbed 17%. 

• No; CM2 absorbed 7% of the leachate DOC, whereas CM3 absorbed 35%. 

• No; CM2 absorbed 17% of the leachate DOC, whereas CM3 absorbed 55%. 

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-4

What was the independent (manipulated) variable in each of the 3 studies and what was the independent variable across the 3 studies?

• in each study / across the studies

  type of lake water / type of clay material

• in each study / across the studies

  type of leaf leachate / type of clay material

• in each study / across the studies

  volume of leaf leachate / mass of clay material

• in each study / across the studies

  volume of filtrate / mass of leaves

Tags

NGSS.HS-PS1-3

According to the results of the studies, which of the 3 clay minerals, if any, reduced the DOC in the oak leachate by more than 50% ?

• CM1 only

• CM2 only

• CM1 and CM3 only

• None of the 3 clay minerals

Is a mixture of any one of the leachates and any one of the clay minerals properly considered a solution ?

• Yes, because the clay mineral particles are dissolved in the leachate.

• Yes, because the clay mineral particles are not dissolved in the leachate.

• No, because the clay mineral particles are dissolved in the leachate.

• No, because the clay mineral particles are not dissolved in the leachate.

In lake water, DOC is broken down into simpler compounds by electromagnetic energy in the viable wavelength range. What action was taken in the studies to prevent this process from occurring?

• Each mixture of leaves and filtered lake water was placed in the dark

• Each mixture of filtrate and clay mineral was placed in the dark

• Each mixture of leaves and lake water was filtered

• Each mixture of leachate and clay mineral was filtered