Question

Jackie read that

Aloe vera

promoted healing on burned tissue. She decided to investigate the effect of various

amounts of

Aloe vera

on the regeneration of planaria worms. She started with 7 worms and bisected the planaria to

obtain 14 parts (7 heads and 7 tails) for each experimental group. She applied concentrations of 0%, 10%, 20%, and

30%

Aloe vera

to the groups. Fifteen mL of

Aloe vera

solutions were applied. All planaria were maintained in a

growth chamber with identical food, temperature, and humidity. On day 15, Jackie observed the regeneration of the

planaria parts and categorized development as full, partial, or none.

What is the hypothesis (if/then statement) for this particular experiment?

What are the dependent variable and the independent variable?

What controls are they using in their experimental setup?

When they performed the experiment, they collected the data shown below:

Percent Aloe Vera Count of Regenerated Planaria

0% 2

10% 5

20% 7

30% 3

Should the hypothesis be supported or rejected based on the experiment? Why

Answer 1

a)The hypothesis :

Aloe Vera gel promotes regeneration.

b) Dependent variable is development of planaria parts. Independent variable is the percentage of aloe vera gel applied.

c) Control varible are the bisected planaria worms with 0% aloe vera gel applied on them.

d) From the data collected we see that on the application of small amount of aloe vera gel (10%-20%) regenerated planaria are more as compared to the control (0% aloe vera), but if the amount of aloe vera gel in 30% then the regeneration is near to the control. Thus the hypothesis is that aloe vera gel helps in regeneration is true, but only a small amount of it should be used.