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Biology Sem 1 Midterm Review
Biology Sem 1 Midterm Review
31
Science
9th Grade
09/29/2014

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Term
Hypothesis
Definition
A testable explanation that uses the form: If (independent variable), then (dependent variable).
Term
Independent Variable
Definition
The variable that is changed. It causes something to happen. Also called manipulated variable.
Term
Dependent Variable
Definition
The result in the experiment. Also called the responding variable.
Term
Control Group
Definition
The group that does not recieve the treatment or the independent variable. This is used for comparison.
Term
Controlled variables
Definition
Not to be confused with the control group. These are all the other variables in the experiment that must be kept the same so that these do not impact the results.
Term
Problem
Definition
A testable question in an experiment
Term
Results
Definition
The data and observations made in an experiment
Term
Conclusions
Definition
This is the explanation of the experiment. It refers back to the hypothesis as well as gives details about experimental error and provides reasoning about the meaning of the results.
Term
Experimental Error
Definition
Sources or components in the experiment that may have affected the accuracy of the results
Term
Where is the independent variable found on a graph?
Definition
x - axis
Term
Where is the dependent variable found on a graph?
Definition
y - axis
Term
niche
Definition
a particular living space and arrangement for a species in an ecosystem
Term
What does DRY MIX stand for?
Definition
D = Dependent variable
R = Responding variable
Y = Y-axis

M = Manipulated variable
I = Independent variable
X = X-axis
Term
What is meant by biotic?
Definition
Living (or once living)
Term
What is meant by abiotic
Definition
Non-living (never was living)
Term
If an organism dies is it biotic or abiotic?
Definition
It is biotic because it was once living. (Abiotic means that it was never living.)
Term
Put the levels of organization of life in order
Definition
atom, molecule, organelle, cell, tissue, system, organism, population, community, ecosystem, biome, biosphere
Term
What is the difference between a food web and a food chain?
Definition
A food chain shows only one series of energy transfers as organisms eat but a food web shows all (or at least many) of the the energy transfers in the ecosystem.
Term
What is a producer?
Definition
These are organisms that go through the process of photosynthesis to make food from the energy of the sun.
Term
What is an example of a producer?
Definition
plants such as grass, trees, flowers, or photosynthetic algae
Term
What is a consumer?
Definition
These are organisms that eat other organisms to get energy.
Term
What is a primary consumer?
Definition
These are organisms that eat only plants or other photosynthetic organisms.
Term
What is a secondary consumer?
Definition
This is an organism that hunts and eats another organism.
Term
What is prey?
Definition
This is an organism that was hunted and eaten by another organism.
Term
What is the carrying capacity of a population?
Definition
This is the point at which the population size levels off because of limiting factors such as available food and water.
Term
What does a j-shaped curve show on a population graph?
Definition
This shows exponential growth of a population (rapid increase in population size).
Term
What does an s-shaped curve show on a population graph?
Definition
This shows an initial increase in population growth but then the growth of the population slows as it reaches the carrying capacity.
Term
What is symbiosis?
Definition
This is the direct relationship two or more species have with each other.
Term
What is mutualism?
Definition
This is a type of symbiosis in which both organisms benefit from their relationship.
Term
What is commensulism?
Definition
This is a type of symbiosis in which one organism is benefited and one is unaffected.
Term
What is parasitism?
Definition
This is a type of symbiosis in which one organism is benefited and one is harmed.
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