Question

instructions: for the following experiments, identify and describe the (iv) independent variable, (dv) dependent variable, (cg) control group, and (con) the constant.

1. different rose bushes are grown in a greenhouse for two months. the number of flowers on each bush is counted at the end of an experiment.

iv the different types of rose bushes
dv the number of flowers on each bush
con the amount of time they were being grown

1. you water three sunflower plants with salt water. each plant receives a different concentration of salt solutions. a fourth plant receives regular water. after a two - week period, the height is measured.

iv the different concentration of salt each plant receives
dv the height of the plant
cg

1. three wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. one tree is left outside in normal conditions. height of the tree is measured once a week.

iv
dv
cg
con the amount of time the plant is being grown for and the amount of time the height is measured each week

1. one tank of goldfish is fed the normal amount of food once a day, a second tank is fed twice a day, and a third tank four times a day during a six week study. the fish’s body fat is recorded daily.

iv
dv
cg
con

1. strawberry plant clones are given different amounts of water for a 3 - week period. first strawberry plant receives 400 millilitres (ml) a day. the second strawberry plant receives 200ml a day. the third strawberry plant receives 100ml a day. the fourth strawberry plant does not receive any extra water; this plant only receives natural ways of receiving water. the height of the strawberry plants is recorded daily.

Explanation:

Step1: Identify independent variable (IV) for 3

The IV is what is changed. For the wax - palm trees, it's the humidity levels inside the greenhouse.
Humidity levels inside the greenhouse

Step2: Identify dependent variable (DV) for 3

The DV is what is measured. Here, it's the height of the tree.
Height of the tree

Step3: Identify control group (CG) for 3

The control group is the one not exposed to the experimental variable. The tree left outside in normal conditions is the control group.
The tree left outside in normal conditions

Step4: Identify independent variable (IV) for 4

The IV is the frequency of feeding the goldfish.
Frequency of feeding the goldfish

Step5: Identify dependent variable (DV) for 4

The DV is what is measured, which is the fish's body fat.
Fish's body fat

Step6: Identify control group (CG) for 4

The control group is the tank fed the normal amount of food once a day.
The tank of goldfish fed the normal amount of food once a day

Step7: Identify constant (Con) for 4

The constant could be the species of goldfish, the duration of the study (six - week), etc.
Species of goldfish, duration of study

Step8: Identify independent variable (IV) for 5

The IV is the amount of water given to the strawberry plant clones.
Amount of water given to strawberry plant clones

Step9: Identify dependent variable (DV) for 5

The DV is the height of the strawberry plants.
Height of the strawberry plants

Step10: Identify control group (CG) for 5

The control group is the fourth strawberry plant that only receives natural water.
The fourth strawberry plant that only receives natural water

Step11: Identify constant (Con) for 5

The constant could be the type of strawberry plant clones, the duration of the study (3 - week).
Type of strawberry plant clones, duration of study

Answer:

3)
IV: Humidity levels inside the greenhouse
DV: Height of the tree
CG: The tree left outside in normal conditions
Con: The amount of time the plant is being grown for and the amount of time the height is measured each week
4)
IV: Frequency of feeding the goldfish
DV: Fish's body fat
CG: The tank of goldfish fed the normal amount of food once a day
Con: Species of goldfish, duration of study
5)
IV: Amount of water given to strawberry plant clones
DV: Height of the strawberry plants
CG: The fourth strawberry plant that only receives natural water
Con: Type of strawberry plant clones, duration of study