WorksheetsPQ: Unit 0
Total questions: 30
Worksheet time: 15mins
hypothesis makes a statement that suggests or advises a potential result or outcome that an investigator or researcher expects
null hypothesis
standard hypothesis
alternate hypothesis
research hypothesis
the hypothesis that there is no significant difference between treatments, any observed difference being due chance
null hypothesis
standard hypothesis
alternative hypothesis
research hypothesis
variable the experimenter changes or controls and is assumed to have a direct effect on another variable
independent variable
dependent variable
variable being tested and measured in an experiment
independent variable
dependent variable
Researcher tested ability of yeast to grow on media. Mutant haploid yeasts (1&2) used. What was the role of Treatment I?
treatment, determine that yeast was viable
control, determine that yeast was viable
treatment, determine that mutant 1 & 2 unable to grow without amino acids
control, determine that mutant I & 2 unable to grow without amino acids
Researcher tested ability of yeast to grow on media. Mutant haploid yeasts (1&2) used. Predict diploid yeast on each.
No growth on any treatment media (1, 2, 3, & 4)
Growth on treatment medias 1, 3, & 4, but no growth on 2.
Growth on all treatment media (1, 2, 3, & 4)
Growth on treatment medias 1, but no growth on 2, 3, or 4.
To test experimenter's claim (mobile invertebrates transfer pollen in absence of water) - Identify negative control.
female flower & invertebrates (no male flower)
male flower & invertebrates (no female flower)
male flower, female flower, and invertebrates
male flower & female flower (no invertebrates)
To test experimenter's claim (mobile invertebrates transfer pollen in absence of water) - Identify experimental group.
female flower & invertebrates (no male flower)
male flower & invertebrates (no female flower)
male flower, female flower, and invertebrates
male flower & female flower (no invertebrates)
Identify dependent variable.
Fertilized male flower
Presence of invertebrates
Fertilized female flower
Absence of invertebrates
To investigate the role of genes on insecticide resistance, researchers deleted genes. Identify the control strain.
I
II
III
IV
Design experiment with artificial flowers to test negative effects of increased caffeine levels in nectar on visits. What is the null hypothesis?
The control will have more visits than high & less visits than low group
The control will have same number of visits as the treatment group
The control will have more visits than the treatment group
The control will have less visits than the treatment group
Design experiment with artificial flowers to test negative effects of increased caffeine levels in nectar on visits. What is the control?
Artificial flower with same concentration of caffeine as "normal" flowers
Real flower with no caffeine
Artificial flower with no caffeine
Real flower with "normal" level of caffeine
Researchers investigating prolactin levels due to exercise. Justify control of without exercise.
most people do not exercise
attribute changes to exercise only
observe how the body breaks down prolactin
different exercise affects individuals differently
Observe the effect of the tip on plant growth. Identify the control.
I
II
III
IV
Describe independent variable for experiment to test hypothesis that a higher trichome density selected for w/herbivores
presence of herbivores
trichome density
number of successful generations
absence of herbivores
Describe dependent variable for experiment to test hypothesis that a higher trichome density selected for with herbivores
presence of herbivores
trichome density
number of successful generations
absence of herbivores
Describe control for experiment to test hypothesis that a higher trichome density selected for w/ herbivores
presence of herbivores
trichome density
number of successful generations
absence of herbivores
Identify duration for experiment to test hypothesis that a higher trichome density selected for with herbivores
one generation
two or more generations
Predict results for experiment to support hypothesis that a higher trichome density selected for with herbivores
increased trichome density in the presence of herbivores
decreased trichome density in the presence of herbivores
no change in trichome density in the presence of herbivores
no change in trichome density in the absence of herbivores
Propose an improvement to the experimental control.
Replace dry cotton with piece of fruit
Replace the glucose-soaked cotton with piece of fruit
Replace dry cotton with water soaked cotton
Replace the glucose-soaked cotton with water soaked cotton
Question: How does ethyl alcohol affect urine output? State null hypothesis.
Ethyl alcohol has a negative affect on urine output
Ethyl alcohol has a positive affect on urine output
Ethyl alcohol has no affect on urine output
Ethyl alcohol has an inconclusive affect on urine output
Question: How does ethyl alcohol affect urine output? State conclusion based on the data from the experiment.
Ethyl alcohol has a negative affect on urine output
Ethyl alcohol has a positive affect on urine output
Ethyl alcohol has no affect on urine output
Ethyl alcohol has an inconclusive affect on urine output
Identify the control for this experiment.
Sample 1
Sample 2
Sample 3
There is no control
What is Sample 2 testing?
The effect of light on photosynthesis
The effect of pH on photosynthesis
The effect of temperature on photosynthesis
It is the control
What is Sample 3 testing?
The effect of light on photosynthesis
The effect of pH on photosynthesis
The effect of functional organelles on photosynthesis
It is the control
Which of the following types of data would be most useful for the scientists to collect on the test plot of rose plants?
Amount of sunlight
Mean temperature
Density of rose pollen
Amount of pollen produced by each flower
Which of the following can be concluded from the experimental results?
Chloroplast must be suspended in buffer solution to function properly
The optimal temperature for activation of electron transfer is 25*C
The DCPIP inhibits biochemical reactions in suspended chloroplasts
Light from lamp can substitute for sun in stimulating chloroplast processes
If additional sample containing chloroplast/DCPIP was placed at distance of 90cm, which predictions consistent with the results?
The concentration of DCPIP in the solution will increase exponentially
The absorbance at 60 minutes will be roughly equal to 1.4
The change in absorbance over time in solution will be < the other samples
The temperature of the solution will exceed 75*C
What is the INDEPENDENT VARIABLE?
Annabelle wanted to know if Bic pens would last longer if she used cardstock rather than copy paper. She used 5 Bic pens on cardstock and 5 Bic pens on copy paper. She used the same color ink in every pen.
Amount of time
Type of Paper
Writer's strength
Color of ink
A class of students took a science test. Their teacher wants to compare the performance per class to find out if most students are on "the same page". All three classes got a mean of 72%. 2nd period has a standard deviation of 14.5, 4th period has a standard deviation of 4.3 and and 6th period has a standard deviation of 8.6. In which class are students most equal and performing at the same level? How do you know?
6th period: It shows the highest deviation from the mean, meaning the overall data is quite spread out
6th period: It shows the highest deviation from the mean, meaning the overall data is not too spread out
2nd period: It shows the lowest deviation from the mean, meaning the overall data is not too spread out
4th period; It shows the lowest deviation from the mean, meaning the overall data is not too spread out
4th period; It shows the highest deviation from the mean, meaning the overall data is quite spread out
