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8th grade Science End-of Year Assessment
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Why does sexual reproduction help survival?
More variation increases adaptation
Which is evidence of climate change?
Long-term temperature trends
Why do denser liquids sink in a column?
Greater mass per volume
Why is it warmer at the equator than at the poles?
the sun is at an angle towards the pole
Why does low pressure often bring storms?
warm air rises, cools, condenses and forms clouds
Which situation BEST shows natural selection?
 
Individuals with helpful traits survive and reproduce
 
All organisms survive equally
 
Traits are chosen randomly
 
Organisms choose traits
Why would a population split into two groups over time?
Different traits are favored in different environments
Order the liquids from most to least dense: 25 g/mL, 5 g/mL, 10 g/mL
5 g/mL, 10 g/mL, 25 g/mL
Physical properties can be observed without changing the substance.
true
Where do you find the atomic mass of an element on the periodic table.
Bottom number that is a decimal
Matter is anything that...
Has mass and takes up space
Two or more atoms bonded together
molecule
The periodic table is arranged by
Atomic number
What two things drive the water cycle?
Sun’s energy and gravity
Gravity’s role in the water cycle is to
Pull water downward
Air pressure moves from...
High to low pressure
The boundary between air masses is called a ...
Front
Why does sunlight intensity vary on Earth?
Angle of sunlight
What affects the flow of ocean currents and wind?
shape of landforms
Which food produces the MOST carbon emissions?
 
Beef
 
Carrots
 
Tomatoes
 
Rice
Pollination between two different plants is what type of reproduction?
Sexual
Will an environmental factor such as drought affect plant growth?
yes
Will a plant placed in sunlight grow more or less than if it were placed in darkness?
more
What is an advantage of sexual reproduction over asexual reproduction?
Increases genetic diversity
Sexual reproduction results in offspring that have
Have genetic variation
What type of environment would favor flowers that open at night?
Presence of nocturnal or nighttime pollinators
What will MOST likely happen over generations if different traits help organisms survive in different parts of an environment?
 
Different populations will form based on traits
 
All organisms become identical
 
All organisms die
 
Traits disappear
Which is a cause of mutations?
exposure to UV light, x-rays, radiation, chemicals
A section of DNA that codes for a trait is called a
Gene
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