Characteristics of Life
Microscope
Controlled Experiment I
Controlled Experiment II
Tables and Graphs
100
List the characteristics of Life.
1. Made of cells 2. Reproduce 3. Universal genetic code 4. Growth and development 5. Obtain and use material and energy 6. Respond to environment 7. Homeostasis 8. Change over time
100
How do you carry a microscope?
By the base and the arm.
100
What is the independent variable?
the variable that is changed from control group to experimental group
100
What is a controlled variable?
the variable(s) that is/are kept constant throughout the test groups
100
2 cm is an example of what type of data?
Quantitative
200
What does homeostasis mean? Give an example.
To maintain a stable internal environment. Example: sweating, shivering
200
What part of the microscope do you look through when observing a specimen?
the eye piece
200
What is the dependent variable?
the variable that responds to the change
200
How does the control group differ from the experimental group?
the control group does not have the independent variable applied to it (left in normal conditions) and the experimental group has the independent group applied to it.
200
What is an example of qualitative data?
The quality of something (ex:warm, bubbling, rough texture)
300
How do all things have the a unviveral genetic code?
All living things have DNA which is made up of the same 4 base units throughout all living organisms.
300
How do you calculate the total magnification?
eye piece power X objective power
300
What is a controlled experiment?
An experiment that changes only one variable at a time.
300
What is the difference between an observation and an inference?
An observation uses the five senses and an inference is an explanation of an observation
300
On what axis is the independent variable graphed on?
X-axis
400
Explain why living organisms have common ancestors. What characteristic of life does this represent?
Evolution- due to environmental changes, organisms change over time. As organisms continue to change they become less similar to the common ancestor they evolved from originally.
400
What part of the microscope adjusts the amount of light coming through the specimen?
Diaphragm
400
How is a theory different from a hypothesis?
a theory is a well tested explanation which is broad in scope and a hypothesis is a prediction regarding a specific situation
400
Explain the difference between "data" and "results".
Results are the interpretation of the data.
400
When is it best to use a bar graph?
When comparing groups
500
Explain why fire is not considered alive but a bean seed would be considered living.
Fire lacks cells and DNA. The bean seed is dormant but given the right environmental conditions, it would exhibit all the characteristics of life.
500
How do you focus a slide under the oil immersion objective?
Place the slide on the stage and secure with the stage clips. Using the coarse adjustment, focus and center the image in the field of view under the low power objective. Once the image is focused, rotate the nosepiece to the high power objective and focus using the fine adjustment. Once the image is centered in the FOV, rotate the nosepiece to the oil immersion objective and focus using the fine adjustment.
500
What would be a hypothesis for the observation of bubbles forming on aquatic plants in the sunlight?
If the amount of sunlight is related to the amount of bubbles, then the more sunlight given to the plants, the more bubbles will form because the plant can undergo photosynthesis and produce oxygen gas.
500
Explain how you would set up an experiment to test if taking vitamin C will prevent people from getting the flu.
two groups: control group = no Vit. C ( can give control group a placebo) exp. group= vit C Both groups exposed to flu Controlled variable= same gender, age, rest
500
Explain how a graph is useful in a scientific presentation such as a lab report.
easier to compare data, can show trends or patterns, condense large amount of information into an understandable form
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