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 !
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.
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
1. Based on the given information, your answer for the problem is correct. The problem is to investigate the effect of light on the growth of Spanish needle seeds.
2. Your hypothesis is partially correct. However, the hypothesis should be more specific and include the comparison of different colors of light. Here's an improved hypothesis: "If the Spanish needle seeds are exposed to different colors of light, including sunlight, red light, and green light, then the growth of the seeds will be the greatest in sunlight compared to red and green light."
3. Your answer for the independent variable is correct. The independent variable in this experiment is the different colors of light used to grow the Spanish needle seeds.
4. Your answer for the dependent variable is correct. The dependent variable in this experiment is the growth of the Spanish needle seeds, measured in centimeters.
5. Your control group is incorrect. The control group should be the group that receives the "normal" treatment, which in this case is normal sunlight. Therefore, the control group is the tray of Spanish needle seeds exposed to sunlight.
6. Your answer for the constants is correct. The constants in this experiment include the exposure of light to the Spanish needle seeds, the amount of water given, and the type of soil provided to all the trays.
To construct a graph for problem 7, you can use a line graph. The x-axis should represent the different days (1, 2, 3, etc.), and the y-axis should represent the growth of the Spanish needle seeds in centimeters. Each line on the graph should represent a different treatment (sunlight, red light, and green light). Then, plot the data points from table 1 on the graph and connect them with lines to show the growth of the Spanish needle seeds over time for each treatment.