Maria
8th Grade Science Released Tests - Life1 - Ecosystems & Adaptations
6
8th Grade Science Released Tests - Life1 - Ecosystems & Adaptations
600
0
For separate ecosystems to be classified as the same type of biome, they must —10001have deciduous forests001be located along the equator001have similar organisms and climates11001be at least one hundred square meters in area001Otters have adaptive traits that allow them to survive by eating shellfish and crustaceans. If changes in biotic factors of the ecosystem result in reduced numbers of shellfish and crustaceans, the otters will most likely —10001experience a population decline11001adapt to a different ecosystem001change the genetic makeup of their bodies001increase reproduction rates001<img src="30.png" alt="30.png" title="30" width="234" height="112"></img><br />(2003) Scientists have spent many years studying the peppered moth, which is a species that has adapted its color from light to dark in reaction to environmental pollution. Which of the following line graphs represents the data from the table?10001<img src="30a.png" alt="30a.png" title="30a" width="221" height="126"></img>11001<img src="30b.png" alt="30b.png" title="30b" width="220" height="127"></img>001<img src="30c.png" alt="30c.png" title="30c" width="220" height="124"></img>001<img src="30d.png" alt="30d.png" title="30d" width="220" height="125"></img>001<img src="6.png" alt="6.png" title="6" width="228" height="256" style="float: right;"></img>(2003) Lemmings are small mammals that experience a population explosion about once every four years. Snowy owls eat lemmings. Which of these statements is supported by the data in this graph?10001The snowy owls are becoming extinct.001Lemmings live much longer than snowy owls.001The habitat of the lemmings is continuously decreasing in size.001The snowy owl population increases because of an increase in lemmings.<br /><br /><br /><br />11001(2003) These birds all live in Virginia. One of the bird’s main sources of food is the nectar inside long, trumpet-shaped flowers. A second bird eats mostly rodents. The third bird often is seen pecking into the bark of the local trees to get the insects just inside. Which of the following lists has correctly matched the pictured birds with their diets?<img src="47-3.png" alt="47-3.png" title="47-3" width="233" height="297" style="float: right;"></img>10001Ruby-throated Hummingbird–nectar; Red-tailed Hawk–insects; Yellow-bellied Sapsucker–rodents001Ruby-throated Hummingbird–insects; Red-tailed Hawk–nectar; Yellow-bellied Sapsucker–rodents001Ruby-throated Hummingbird–rodents; Red-tailed Hawk–nectar; Yellow-bellied Sapsucker–insects001Ruby-throated Hummingbird–nectar; Red-tailed Hawk–rodents; Yellow-bellied Sapsucker–insects<br /><br /><br />11001<img src="33-4.png" alt="33-4.png" title="33-4" width="359" height="81"></img><br />(2004)Some snapdragon seeds were studied in the experiment above. The seeds were placed in a dish lined with a moist paper towel. Which of these is the independent (manipulated) variable in this experiment?10001The type of seed001The amount of water used001The number of sprouts001The temperature of each dish11001(2004) In which of the following environments would you expect to find the greatest number of different species of plants and animals per square mile?10001An island near the South Pole001A wheat field in North Dakota001A pasture on a Virginia farm001A tropical rain forest in Panama11001(2003) Northern garter snakes exhibit a unique behavior in which they gather in deep dens by the hundreds or thousands. They then coil together in a huge ball. This behavior could help to —10001reduce heat loss11001increase camouflage001locate food sources001increase oxygen consumption001(2004) Which biome contains large populations of grazing herbivores, few species of birds, and deep, rich soil?10001A taiga001A tundra001A deciduous forest001A grassland11001<img src="5-4.png" alt="5-4.png" title="5-4" width="250" height="306" style="float: right;"></img>(2004) Which of these species would be <em>most </em>in danger of becoming extinct if one of their food sources became unavailable?10001Brown bear001Panda11001Polar bear001Black bear<br /><br /><br /><br /><br />001(2003) The kangaroo rat is able to get all of the water it needs through its food and, therefore, never needs to drink liquids. This animal has adapted to survive in which biome?10001Forest001Tundra001Desert11001Grassland001(2004) Which of the following are characteristics of the most productive ecological environment?10001Stable temperatures and high rainfall amounts11001Hot temperatures and low rainfall amounts001Cold temperatures and low rainfall amounts001Low temperatures and high rainfall amounts001(2003) Which of these could cause a decrease in the number of squirrels in a population?10001An increase in cooperation with birds in the area001An increase in the squirrels’ territory001An increase in competition with other nut-eating animals11001An increase in the squirrels’ food supply001A coal-burning facility is constructed in an area containing several pond ecosystems. How will this human activity most likely affect the pond ecosystems?10001More nutrients will be available.001Organism diversity will increase.001Disease will become less common.001Water quality will be reduced.11001<img src="40-4.png" alt="40-4.png" title="40-4" width="260" height="279" style="float: right;"></img>(2004) The picture shows a pond ecosystem. What would <em>most likely </em>happen if all the lily plants were removed from this community?10001There would be more oxygen in the air.001The pond water currents would be slower.001There would be more kinds of animals in the pond.001The animals would have fewer places to hide.<br /><br /><br />11001(2003) In which biome would you find the most variety of life?10001Tundra001Desert001Grassland001Rain forest11001There are harvesting regulations for many fish species that limit the number and size of the fish that may be kept. What is the most likely reason these limits have been placed on harvesting these fish?10001To have enough fish for zoo aquariums001To keep other game fish species populations low001To have people spend more money on fishing001To keep a healthy population of adult fish11001Black bears roam over large territories. What effect would building shopping centers in these territories have on the bears?10001Promote an increase in black bear reproduction001Stabilize the black bear population001Reduce the black bears’ habitat11001Introduce a new bear population to the area00110001001001001001
Correct!
Sorry! Try again.
Your answer is partly wrong:
Please enter a guess.
Next correct letter in the answer:
Correct answers:
Show answer
0
0
nextpage.htm
0
1
1
0
0
0
2
2
0
0
0
Your score is
:-)
X
Questions answered correctly first time:
Questions completed so far:
You have completed the exercise.
Your time is over!
=>
<=
Index
0
0
0
contents.htm
Geneva,Arial,sans-serif
small
#edeacf
#000000
#edeacf
#400000
#0000FF
#0000CC
#000000
http://yourserver.com/cgi-bin/FormMail.pl
you@yourserver.com
Please enter your name:
one
two
three
Questions answered correctly first time:
Check
OK
=>
<=
Hint
Show all questions
Show questions one by one
1
0
0