Question

i want you to check my answers for the questions and i might need help on constructing the graph that i need to do for problem 7.

variables and graphing assessment practice

some students wanted to investigate the effect of light on the growth of spanish needle seeds (bidens pilosa). they set up trays with 50 seeds each. all the trays received the same treatment (same amount of water, soil, etc.) except for the color of the light they were exposed to. the experiment used red, green, and normal sunlight, the students ran the experiment.

table 1 : growth of spanish needle plants in different colors of light

treatment sunlight
day 1 (in cm) 0
day 2 (in cm) 1
day 3 (in cm) 4
day 4 (in cm) 12
day 5 (in cm) 15
day 6 (in cm) 17
day 7 (in cm) 23
treatment red light
day 1 (in cm) 0
day 2 (in cm) 0.5
day 3 (in cm) 2
day 4 (in cm) 8
day 5 (in cm) 10
day 6 (in cm) 12
day 7 (in cm) 14
treatment green light
day 1 (in cm) 0
day 2 (in cm) 0
day 3 (in cm) 1
day 4 (in cm) 4
day 5 (in cm) 6
day 6 (in cm) 8
day 7 (in cm) 10

here are the questions and my answers so now you check them !:

1. what is the problem?
my answer: some students wanted to investigate the effect of light on the growth of spanish needle seeds.

2. write a hypothesis for this experiment.
my answer: if the students compared the growth of the spanish needle seeds with sunlight to other lights, then sunlight will show the best results.

3. what is the independent variable?
my answer: the lights being used to grow the spanish needle seeds

4. what is the dependent variable?
my answer: the growth of the spanish needle seeds

5. what is the control group?
sunlight

6. name 3 constants.
my answer: exposure of light to the spanish needle seeds, amount of water given, and type of soil

tank you very much tutors for the help !

Answer 1

2. write a hypothesis for this experiment.
my answer: if the students compared the growth of the spanish needle seeds with sunlight to other lights, then sunlight will show the best results.
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Are you sure?
Sunlight is your control and maybe (probably) the control will do best.
However I would hypothesize that one color grows them better than others.

Temperature is probably an important constant.

Answer 2

i like my hypothesis, i don't need to prove it's right, right ?? i just chose sunlight because of the data table that shows that sunlight grew better than red light and green light.
for temperature as a constant, do i write the temperature to spanish needle seeds ? tank you very much tutor damon