Question

1. pea plant clones are given different amounts of water for a three - week period. first pea plant receives 400 milliliters. second pea plant receives 200 milliliters. third pea plant receives 100 milliliters. fourth pea plant does not receive any extra water; the plant only receives natural ways of receiving water. the height of the pea plants is recorded daily.

iv:
dv:
constants:
control:

1. one tank of goldfish is fed the normal amount which is once a day; a second tank is fed twice a day; and a third tank is fed four times a day during a six - week study. the fishes’ body fat is recorded daily.

iv:
dv:
constants:
control:

1. you decide to clean the bathroom. you notice that the shower is covered in a strange green slime. you decide to try to get rid of this slime by adding lemonade juice. you spray half of the shower with lemonade juice and spray the other half of the shower with water. after 3 days of “treatment”, there is no change in the appearance of the green slime on either side of the shower.

iv:
dv:
constants:
control:

Explanation:

For each experiment, identify:

• Independent Variable (IV): Factor changed by the experimenter.
• Dependent Variable (DV): Factor measured/observed.
• Constants: Factors kept the same for all groups.
• Control: Group with standard/unchanged condition for comparison.

Answer:

4) Pea Plant Experiment

IV: Amount of water (400mL, 200mL, 100mL, natural only)
DV: Height of pea plants
Constants: Pea plant clones, 3-week period, daily height recording
Control: Pea plant with only natural water

5) Goldfish Experiment

IV: Feeding frequency (once, twice, four times daily)
DV: Goldfish body fat
Constants: Goldfish tanks, 6-week study, daily body fat recording
Control: Tank fed once a day (normal amount)

6) Shower Slime Experiment

IV: Substance sprayed (lemonade juice vs. water)
DV: Appearance of green slime
Constants: Shower location, 3-day treatment period
Control: Half of the shower sprayed with water