Science practices
What does the word hypothesis mean?
An educated guess about an answer to a question.
____________ is a community of organisms and their physical environment.
ecosystem
What are the 3 branches of government?
Executive, Legislative, Judicial
“These are the basic units of life that make up all living things.”
cells
What does representative sample mean in terms of a scientific experiment?
Why is a representative sample important in an experiment?
A sample that is similar to the entire population.
To obtain accurate results to the experiment.
Photosynthesis makes _________
Cellular respiration uses ______________
glucose
glucose
This document divides the U.S. government into three branches: legislative, executive, and judicial.”
The US Constitution
In an experiment, this is the variable that is purposely changed by the scientist.”
independent variable
A student tests whether music helps plants grow. He plays music for one plant and no music for another. He doesn't want to buy new plants, so he uses 2 plants he already has. One is a tomato plant and one is a bean plant.
Is his experiment valid? Why or why not?
No, he changed more than 1 thing. He changed type of plant and music/no music.
__________is the process that cells use to break down glucose and release stored energy.
cellular respiration
What is a sovereign nation?
A nation that is independent and has authority over itself.
Researchers studied people with and without acne. They collected bacteria samples from each person’s skin. They found that some types of bacteria were common in people with clear skin, while other types were common in people with acne.
What is the independent and dependent variable?
Scientists observed unusual plant and algae growth in a pond. They sampled the water and also discovered very high concentrations of bacteria. Significant increases in the growth of plants, algae, and bacteria in ponds are often caused by an excess of phosphates and nitrates in the water. The pond was fairly close to neighboring farmland, and two streams carried water from the farm to the pond. ▶ What could be a sound hypothesis about the growth in the pond?
(1) Runoff from the neighboring farm may be carrying excessive phosphates and nitrates from fertilizers into the pond.
(2) Proximity to farmland is the cause of plant and algae growth in ponds and other bodies of water.
If you chose (1), you are correct. That hypothesis is an educated guess about the reason for the unusual plant and algae growth in the pond.
What are primary producers?
These are usually plants or other organisms that make their own food through a process called photosynthesis.
What do the first 3 articles of the constitution create the structure of ?
The US Government
In the United States Constitution, this process allows changes to be made, but requires approval from both the states and the federal government.”
The amendment process
A teacher wants to know if chewing gum helps students remember more information. She gives two groups of students the same list of words. One group chews gum while studying, and the other group does not. Later, both groups take the same quiz.
Independent Variable
Dependent Variable
Control Variables
Whether the student chews gum or not
Score on the quiz
Word list, testing time, test format
“These three processes work together in plants to move energy from the sun into usable chemical energy and then release it for cell activities.”
light dependent, light independent, and cellular respiration
This principle in the United States Constitution ensures that no one branch of government becomes too powerful by allowing each branch to limit the others.”
checks and balances
“This system in the United States Constitution divides power between the national government and the states.”
Federalism