PART C: DATA ANALYSIS Learners wanted to investigate the effect of different antibioties on the
growth of certain bacterial species. They set up nutrient agar plates as
shown below. They placed sterile discs containing three different
antibiotics on each of the plates.
4
-Teel
clown
Anthetic 1
Antti
1. State a hypothesis for the investigation
(2)
-Filan
Reproo
2. What is an antbloc?
is a type of antimicrobial substance active
against bacterie
10-09
3. What is the function of agar plates?
(2)
yra
y ever
living
4. Mention one precaution that the learners would have taken to
ensure that their results were valid
(2)
O, N₂
5. State the dependent variable
(3)​

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. the following chemical equation shows the combustion of ethane. balance the equation by filling in the coefficients. c2h6 + o2 → co2 + h2o

The collared lizard is a species found in the desert southwest. male collared lizards show considerable color variation, ranging from brightly colored to a very dull pattern. your goal is to determine the function, if any, of male color patterns in collared lizards, using the scientific method. your tentative explanation is that male color plays a role in attracting females for mating purposes. you predict that females will preferentially choose brightly colored males over dull-colored ones. to test this prediction, you observed the interactions of female collared lizards with their male counterparts. you selected males that were the same age and size, and that differed only in their coloration pattern. you placed equal numbers of the two types of male lizards, bright and dull, in aquariums, along with one female lizard per aquarium. out of 350 aquariums observed, the female chose to mate with the brightly colored male 277 times, and the dull-colored male 70 times. in 3 instances, the females did not mate with either type. create a bar graph of your data, plotting the type of male (dull or brightly colored) on the x-axis. on the y-axis, plot the frequency with which each type of male was chosen by females. using this graph, answer the following question(s). is it reasonable to conclude (i.e., is it supported by the data) that female collared lizards prefer more brightly colored male lizards over dull-colored males?