Transcript 7th Grade Pre

th
7
Grade Pre-Post Test
Science
Question 1
A student observing the sky notices that the cirrostratus
clouds she saw in the morning have been replaced by
cumulonimbus clouds in the afternoon.
What weather conditions can she expect for the afternoon
and evening?
A. low clouds and fog with little temperature change
B. fair skies continuing with scattered puffy clouds
C. light rain, then an increase in temperature and clearing
skies
D. heavy wind and rain followed by a drop in temperature
and clearing skies
Question 2
3. Which sequence correctly shows the
order from simplest to most complex in
multicellular organisms?
4. The primary source of energy for
most living things is
A.
B.
Plants
Sun
C. Food
D. AMP’s
5. What is the relationship between tissues and
organs?
A. Organs are made from one type of tissue.
B. Tissues are made from one type of organ.
C. Tissues are made from different types of
organs.
D. Organs are made from different types of
tissues.
6. In a multicellular organism such as a fish, which of
these items is composed of all the others?
A. Tissues
B. Organs
C. Cell structures
D. Organ systems
7. This cellular process converts light energy
from the sun into chemical energy that
organisms use for life functions.
A. Respiration, in which oxygen is used and
carbon dioxide is given off.
B. Fermentation, in which sugar is broken
down and alcohol is given off.
C. Digestion, in which starch is broken down
into simple sugars.
D. Photosynthesis, in which carbon dioxide is
used and sugars are
•produced.
8. These two plant cell structures are
responsible for storing energy from sunlight
and later releasing it for cells to use.
A. Chloroplast and nucleus
B. Mitochondrion and cell wall
C. Chloroplast and mitochondria
D. Nucleus and cell wall
9. Which cell structure carries out a function
for a cell that is similar to the function that bark
carries out for a tree?
A. Cell Wall
C. Chloroplast
B. Nucleus
D. Mitochondrion
Question 10
A meteorologist collects data on the weather
conditions at an airport. The diagram
shows a weather station model of the data
that he collected.
At the time these data were collected, flights
at the airport were delayed.
According to this information, which weather
condition caused the delay?
A. thick fog
B. heavy snow
C. freezing rain
D. strong winds
Question 11
The sun is a mid-sized, main sequence star.
What stage is next in the life cycle of the
sun?
A. red giant
B. black hole
C. white dwarf
D. neutron star
Properties of Some Substances – Use this chart for questions
12 - 14
A scientist measures out 15 mL each of baking soda,
salt, sugar, iron filings, and corn starch. She runs a
series of procedures and records her results in the
table below. The first column in the table indicates the
procedure. The remaining columns indicate her results
for each substance.
Question 12
According to the information in the table,
what comparison can the scientist make
about the densities of sugar and corn
starch?
A. Sugar is more dense than corn starch.
B. Corn starch is more dense than sugar.
C. Sugar and corn starch have the same
density.
D. Both sugar and cornstarch are more
dense than salt.
Question 13
The scientist observes the rust on the sample
of iron filings and dries the sample
thoroughly. The scientist weighs the entire
sample and finds that it has more mass than
the original 118 grams.
What explains this increase in mass?
A. The sample gained mass during drying.
B. The sample gained mass during a physical change.
C. The sample gained mass during a change of state.
D. The sample gained mass during a chemical change.
Question 14
What two changes does sugar undergo
when heated in a spoon over a flame?
A. two physical changes
B. two chemical changes
C. a chemical change and then a physical
change
D. a physical change and then a chemical
change
Question 15
The moon orbits the Earth about
every
A. 28 days
B. 31 days
C. 24 days
D. 60 days
Use the water cycle diagram to
answer questions 16-19
Question 16
What evidence suggests that water goes through
a physical change when it evaporates in the water
cycle?
A. The density of the water remains the same.
B. The volume of the water remains the same.
C. The physical properties of the water remain the
same.
D. The chemical properties of the
water remain the same.
Question 17
The diagram includes an ocean in the water
cycle. How does salt water from the ocean
end up as fresh water in precipitation?
A. Runoff leaves salt in the soil.
B. Precipitation leaves salt in the clouds.
C. Evaporation leaves salt in the ocean.
D. Condensation leaves salt in the water
vapor.
Question 18
What is the primary energy source that
drives Earth’s water cycle between the
atmosphere, oceans and land?
A. wind
B. sunlight
C. ocean currents
D. rotation of Earth
Question 19
Water gains energy during evaporation.
During what process in the water cycle is
this energy released?
A. percolation through soil
B. transpiration from plants
C. runoff into the lake and ocean
D. condensation that forms clouds
Question 20 – short answer.
Sea otters are marine mammals that live in
giant kelp forests along the Pacific coast of
North America. Sea otters have an
important role in the food web of this
ecosystem. When sea otters are removed
from the giant kelp forest, the kelp also
begins to disappear.
In your Answer, explain why the absence of
sea otters would lead to a decrease in the
giant kelp.
Then, choose another organism in the food
web and explain why the decreasing
amount of giant kelp would affect that
organism. (2 points)