THE EXPERIMENT Researchers Wanted to Determine If Pesticide Z Was Effective at Effective

Multiple Choice

THE EXPERIMENT
Researchers wanted to determine if pesticide Z was effective at killing grasshoppers that typically invade cornfields.Two ten-acre cornfields located 1 mile apart were chosen.The cornfield to the west was sprayed only with water.The cornfield on the east received the same amount of water with a 10% solution of pesticide Z.Samples of the numbers of grasshoppers in the field were made every week for 10 weeks.
RESULTS
West field treated only with water
The number of grasshoppers in the west field doubled after ten weeks.
East field treated with pesticide Z
The number of grasshoppers in the east field declined by 50% after 10 weeks.
-What was the experimental variable in the above experiment?

A) pesticide Z
B) the number of grasshoppers receiving the pesticide
C) the location of the fields
D) the water sprayed on the fields