Worksheets6TH GRADE CSA #7
Total questions: 16
Worksheet time: 16mins
Which statement best outlines an essential truth about biotic and abiotic factors?
Organisms in a ecosystem can survive without biotic factors but not without abiotic factors.
All biotic factors in an ecosystem depend on abiotic factors.
All abiotic factors in an ecosystems depend on biotic factors.
Organisms is an ecosystem can survive without abiotic factors but not without biotic factors.
In the 1940's, the chemical DDT was used as a pesticide to control mosquito populations in different areas of the world. The use of this chemical contributed to a decrease in eagle populations due to weak egg shells that broke or eggs that did not hatch. An example of an ecosystem that includes eagles is shown in the model.
Based on the information in the model, which statement best explains how DDT was introduced into eagle populations?
The eagles absorbed the DDT after eating large fish.
The eagles absorbed the DDT directly form the water.
The eagles absorbed the DDT directly from the air.
The eagles absorbed the DDT after eating zooplankton.
Based on the diagram, it is reasonable to conclude that matter could follow which of the following paths as it cycles through this ecosystem?
sun --> grass --> robin
grass--> deer--> mountain lion
plant seeds --> field mouse --> robin
eagle --> deer--> plant seeds
Matter is passed from the living part of an ecosystem to the non-living part when which of the following takes place?
Animals drink water.
Animals eat plants.
Plants absorb gases.
Plants decompose into soil.
The energy organisms need to live and grow first enters the ecosystem when_________________.
secondary consumers eat primary consumers.
decomposers break down dead organisms.
plants take in light energy from the Sun.
primary consumers eat plants for food.
One world-wide concern is the removal of forests to make space for farms and other human activities.
Which statement best explains how the removal of trees from Earth upsets the carbon cycles?
The cycle is not affected. There are many other green plants that have the same role as trees in the carbon cycle.
More carbon enters the cycle, reducing CO2 in the air.
Less carbon is pulled from the air and made available to living things.
Decomposers increase because they no longer compete with trees for carbon.
Decomposers increase because they no longer compete with trees for carbon.
Interdependent Relationships in Ecosystems
Aggressive behavior often occurs when individuals or groups of individuals are in competition with one another. Competition is rivalry between individuals or groups over something that both sides want or need. Competition occurs naturally between living organisms that coexist in the same environment.
A student wants to investigate competition between two organisms.
For the investigation, it is most important that the student should choose organisms that ____________.
reproduce at the same rate
require the same resources.
are both active during the day
have the same adaptations.
The graph here shows the populations, over several years, for two animals that share the same habitat. Foxes are mammals that hunt for food, and grouse are birds, a common prey animal of foxes.
According to the data, in which year did the population of foxes show decrease that is most likely the result of a decrease in the availability of a source of food?
2005
2003
2008
2012
Based on the relationship between monarchs and milkweed, which of the following trends would be predicted when looking at data on the populations of these two organisms?
Population increase in monarch butterflies should follow population decrease in milkweed.
Population decrease in monarch butterflies should follow population decrease in milkweed.
Population of milkweed should remain constant when monarch butterfly population increases.
Population of monarch butterflies should remain constant when milkweed population decreases.
The population of deer in a certain area is monitored over a period of six years.
The data is represented in the graph provided.
Which of the following is the most likely explanation for the change in population in 2009?
Rainfall in the previous spring was higher than the yearly average.
Humans introduced grazing animals that feed on the same plants as the deer.
More insects that pollinate flowering plants move into the habitat.
Wolves, which prey on deer, were being hunted more than usual.
Which best describes when two or more individuals or populations attempt to obtain a resource?
Mutually beneficial interaction.
Interdependent interaction.
Predatory interaction.
Competitive interaction.
Many types of clown fish live among the tentacles of sea anemones.
Predators have a hard time finding clown fish that hide within sea anemones. At the same time, clown fish are very territorial and will scare away predators that feed on sea anemones, such as butterfly fish. Clown fish also lure smaller sea creatures into sea anemones. When the creatures are stung by a sea anemone's tentacles, the clown fish can eat them. Any food dropped by the clown fish, as well as the waste products of the clown fish, can be used by sea anemones for nutrients.
Based on this information, which of the following terms best classifies the relationship between clown fish and sea anemones?
Competitive interaction.
Mutually beneficial interaction.
Parasitic interaction.
Predatory interaction.
To support the claim that the consumption of natural resources by humans has a negative impact on the environment, what kinds of data would be needed to provide evidence?
Increasing the consumption of resources by humans and increasing biodiversity.
Increasing human life span over time and global increase in sea level.
Increasing human population and decreasing size of habitats for plants and animals.
Increasing burning of fossil fuels by humans and decreasing use of other resources.
Students decided to remove the litter from an abandoned park and plant trees.
Which of the following observations provides the best evidence that the action of the students has had a positive effect on the health of the park ecosystem?
The level of yearly precipitation increases.
The number and diversity of animals increases.
The number of human visitors decreases.
The average daily high temperature decreases.
Spix's McCaw is an endangered species of bird native to Brazil. The population of the bird has declined over the past 30 years. During this same period, much of the Brazilian rainforest habitat of the bird has been lost due to logging.
What data best supports the claim that logging is a likely cause of the decline in the population of Spix's Macaw?
This bird is a popular pet and has been bred successfully in capivity.
The land cleared by logging is often taken over by farmers for growing crops.
The population of this bird was relatively constant before logging began.
The trees harvested by logging are not those that are usually the home to this bird.
Select each correct answer. Two answers are correct.
The food web below show the feeding relationships of six different populations in an ecosystem.
Which populations compete with one another for food?
sparrow and grasshopper
snake and grasshopper
spider and sparrow
mouse and grasshopper
sparrow and snake
