Question

group,amount of water (ml),amount of seedlings,amount of fertilizer (ml),light exposure,average plant height (cm)
1,500,35,30,natural light,12.3
2,500,35,30,8 hours of artificial light,18.7
3,500,35,30,12 hours of artificial light,22.4
4,500,35,30,16 hours of artificial light,24.6

1. identify the independent variable in this scientific experiment?

a) plant height
b) light exposure
c) tomato seedling type
d) experimental duration

1. identify all the constants in this experiment? (select all that apply)

a) light intensity
b) amount of water
c) amount of fertilizer
d) amount of seedlings used

1. identify the dependent variable in this experiment is:

a) light exposure
b) number of plants
c) plant height
d) experimental duration

Explanation:

Step1: Define independent variable

The variable that is changed or controlled in an experiment. Here, light - exposure is changed (natural light, 8 hours artificial light, etc.), so it's the independent variable.

Step2: Identify constants

Constants are factors that remain the same throughout the experiment. Amount of water (500 mL), amount of fertilizer (30 mL), and amount of seedlings (35) are the same for all groups.

Step3: Define dependent variable

The variable that is being measured or tested. Here, the average plant height is measured, so it's the dependent variable.

Answer:

1. B. Light exposure
2. B. Amount of Water, C. Amount of Fertilizer, D. Amount of Seedlings used
3. C. Plant height