From a scientific point of view, what is a theory?

Widely accepted gen. explanation supported with strong evid.

When you warm up a drink in the microwave, forget it, and find it, how did it become room temp.

Heat from cocoa was transferred to cup and to air in room

A guitar string was tightened while playing. The sound changed because

the rate of vibration increased

The atom model has gone through many changes. Which is MOST likely reason the model has changed

Scientists change theories whenever they obtain new info.

In mitosis, replication occurs before the cell divides. What is the purpose of replication?

Provide each new cell w/ an exact duplicate of original DNA

Scientists have used globes and maps to study Earth. What is an advantage of using a globe?

Globe scale is easier to use to calculate distance on Earth

Which of these is the BEST definition of heredity?

Passage of genetic info. from one generation to the next

What must occur before new scientific knowledge is accepted by the scientific community?

Results must debated, analyzed, repeated by other scientists

Which statement best explains why the Himalayas continue to increase in height?

Earth's continental plates are still colliding

Which of these statements describes a limitation of scientific laws?

Laws do not explain why something is happening

Which statement BEST describes the refraction of light?

Light waves change speed as they pass thru diff. materials.

If different colors of light are used to test plant growth, what is the independent variable?

The different colors of light bulbs used with each group

Predicted outcomes of cross between two parents w/out freckles. (B) freckles / (b) no freckles

None of the offspring will have freckles

Which will MOST likely occur in an un-planted field as a result of increased precipitation?

Erosion of topsoil will increase in the field

How are electromagnetic waves different from other waves?

They can travel through a vacuum and through matter.

Weathering and erosion help shape surface of Earth. Which BEST represents ex. of weathering?

Wind and rain break large rocks into smaller pieces

Elephants were hunted for their tusks, what is MOST likely explanation of tuskless increase.

Fewer elephants with tusks survive to reproduce

Which of the following pieces of evidence BEST supports the theory of plate tectonics?

The coastlines of Africa and S. America match

Which of these events happens during sexual reproduction only?

DNA fm. 2 parents combines to create offspring w/ unique DNA

Which correctly assesses a claim from a scientist that tested on one group of school children.

Not correct b/c he did not gather enough empirical data

What is the MOST important step needed in an investigation of a new discovery in space?

detailed records of observations

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7th Grade Final Review

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Questions 34

Answers

1
From a scientific point of view, what is a theory?
Explanation can't be refuted by additional scientific info.
A description of specific natural events
Explains the dependent and independent vaiables
Widely accepted gen. explanation supported with strong evid.
2
When you warm up a drink in the microwave, forget it, and find it, how did it become room temp.
Heat from cocoa was transferred to cup and to air in room
Heat from the cocoa was released as friction
Cooler temp. of the air in the room was transferred to cocoa
Cooler temp. of counter was transferred to cocoa thru cup
3
The probability a hybrid woman and purebred (recessive) man will have a child with dom. trait?
25%
50%
0%
100%
4
Which are MOST likely to form at the boundary where the sea floor is spreading?
continental shelves
subduction zones
mid-ocean ridges
strike-slip faults
5
Which is an example of an organism that has been selectively bred for particular genetic trait
chickens that lay large eggs
cows that graze on grass
pigs that form large herds
cats that eat mice
6
What object can convert light to electrical energy?
electric fan
wind generator
house with solar panels
firewood
7
A guitar string was tightened while playing. The sound changed because
the pitch decreased
the velocity decreased
the volume increased
the rate of vibration increased
8
The atom model has gone through many changes. Which is MOST likely reason the model has changed
Scientists change theories whenever they obtain new info.
Scientists make guesses on what the atom looks like
Want to make the model easier for students to understand
The appearance of the atom has been changing thru history.
9
Which scientific investigation would help determine the feeding behaviors of humpback whales?
modeling
field studies
systematic observation of killer whales in an aquarium.
laboratory experimentation
10
What unit of measure should you use when placing a beaker on a balance?
grams
joules
newtons
milliliters
11
In mitosis, replication occurs before the cell divides. What is the purpose of replication?
Remove defective base pairs fm DNA b4 parent cell divides
Provide each new cell w/ an exact duplicate of original DNA
Divide parent cell genes equally btwn two new daughter cells
Transfer half traits of parent cell 2 each new daughter cell
12
Which color is produced when all the colors of visible light in the EM spectrum are combined?
Brown
Black
Gray
White
13
You are able to see yourself in a mirror because the light is
absorbed by the mirror
reflected by the mirror
refracted by the mirror
blocked by the mirror
14
MOST of the United States is a part of which tectonic plate?
Eurasian Plate
North American Plate
Pacific Plate
South American Plate
15
Scientists have used globes and maps to study Earth. What is an advantage of using a globe?
Globes are easier to transport
Globes can be used to plan the construction of roads
Earth is round, globe doesn't distort shape of land masses
Globe scale is easier to use to calculate distance on Earth
16
Which of these is the BEST definition of heredity?
Transfer of visible features from one generation to the next
Passage of dominant genes from one generation to the next
The transfer of learning from one generation to the next
Passage of genetic info. from one generation to the next
17
What must occur before new scientific knowledge is accepted by the scientific community?
Data presented to a single scientist to determine acceptance
Results must debated, analyzed, repeated by other scientists
Completely unique exper. and not build on work of others.
Work is unrepeatable by other scientists for originality
18
Which statement best explains why the Himalayas continue to increase in height?
Earth's continental plates are still colliding
High temperatures from Earth's core are increasing pressure.
The Sun's gravitational force is pushing on Earth's surface.
The force of ocean waves is pushing the land up.
19
Which of these statements describes a limitation of scientific laws?
Laws do not provide opportunities to be disproven
Laws do not explain why something is happening
Laws do not have worldwide acceptance
Laws do not describe natural phenomena with enough detail
20
Which statement BEST describes the refraction of light?
Light waves bend and spread around an object in their path.
Light waves change speed as they pass thru diff. materials.
Light waves cause an increase in particle motion in object.
Light waves strike an object and bounce off.
21
If seeds are planted very close together, then plant height will be reduced, what is the DV?
the amount of water given to the seeds
the type of seeds planted
the distance between the planted seeds
the height of the plants
22
If different colors of light are used to test plant growth, what is the independent variable?
the amount of water given to each bean plant
the number of bean plants grown under each light bulb
height of the bean plants on the last day of the experiment
The different colors of light bulbs used with each group
23
Predicted outcomes of cross between two parents w/out freckles. (B) freckles / (b) no freckles
Half of the offspring will have freckles
None of the offspring will have freckles
All of the offspring will have freckles
Three-fourths of the offspring will have freckles
24
Which will MOST likely occur in an un-planted field as a result of increased precipitation?
Invasive species will inhabit the field
More carbon dioxide will be trapped in the field
Animals will dig burrows in the field
Erosion of topsoil will increase in the field
25
How are electromagnetic waves different from other waves?
Change direction by reflection when they strike an object
They transmit energy instead of matter
They have very short wavelengths
They can travel through a vacuum and through matter.
26
Weathering and erosion help shape surface of Earth. Which BEST represents ex. of weathering?
Flowing water transports rocks to the ocean
Wind blows small pieces of rock from one area to another
Wind and rain break large rocks into smaller pieces
Pieces of rock pile on top of each other in layers
27
Elephants were hunted for their tusks, what is MOST likely explanation of tuskless increase.
Hunting elephants resulted in genetic mutation of tusk gene
Elephants began to lose tusks b/c of climate change
Fewer elephants with tusks survive to reproduce
the gene for tusks has become recessive over time
28
Which of the following pieces of evidence BEST supports the theory of plate tectonics?
N. America has four distinct seasons every year
The coastlines of Africa and S. America match
Temps at the equator are much warmer than in Antarctica
The Pacific Ocean is deeper than the Atlantic Ocean
29
Which of these events happens during sexual reproduction only?
Parent splits in half & makes 2 offspring w/ identical DNA
DNA is copied in the parent organism before cell division
DNA fm. 2 parents combines to create offspring w/ unique DNA
Offspring produced with DNA identical to one parent or other
30
The theory of plate tectonics provides the current explanation for the way in which
stars change
tides are produced
rocks are formed
continents move
31
Which correctly assesses a claim from a scientist that tested on one group of school children.
Not correct b/c he did not gather enough empirical data
Not correct b/c he did not work with anotherscientist
Correct b/c the evidence supported it
Correct b/c the scientist won the Nobel Prize in Chemistry
32
What is the MOST important step needed in an investigation of a new discovery in space?
regular time allotments for observations
detailed records of observations
reference material of recent astronomical discoveries
new computer-controlled equipment
33
Which of these describes the transfer of heat by the circulation or movement of heated material
conduction
sublimation
convection
radiation
34
In which layer of the Earth do interactions occur that cause crustal plates to move?
Inner Core
Outer Core
Crust
Mantle

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