Schoolnet Review
What does a food chain represent?
the flow of energy within an ecosystem
What is the main source of energy for all living things?
The Sun
Which result would most likely happen if more grass were added to a savanna biome?
A. There would be an increase in the sun’s rays.
B. Primary consumers would increase in number.
C. Fewer decomposers would be needed to break down old grass.
D. Secondary consumers would find it more difficult to hide from predators.
B. Primary consumers would increase in number.
Which are characteristics of the tundra that limit plant growth?
A. lack of fresh water
B. intense sun and humid air
C. cold temperatures and rocky soil
D. other tall plants blocking available sunlight
C. cold temperatures and rocky soil
Which would be the most likely reason for rabbits in a grassland biome to overpopulate?
A. A drought has caused most of the grass to die.
B. Humans have created a pond in the habitat area.
C. Above-average rainfall has increased the growth rate of grass.
D. Humans have developed the area and cleared away the vegetation.
C. Above-average rainfall has increased the growth rate of grass.
Why is there a limited amount of energy to be passed on to the next feeding level within a food web?
Organisms use some of the energy they obtain.
This chain shows the relationships among organisms within an
ecosystem.
sun → grass → rabbit → hawk
Which statement best explains the purpose of the arrows in the chain?
A. The arrows represent the flow of energy through the food chain.
B. The arrows represent the transfer of water in the food chain.
C. The arrows show the spread of disease through the food chain.
D. The arrows show the exchange of gases in the food chain.
A. The arrows represent the flow of energy through the food chain.
Which example demonstrates energy transfer from a producer to a consumer?
A. an owl eating a mouse
B. a hawk eating a songbird
C. a deer eating corn in a field
D. a mushroom growing on a dead root
C. a deer eating corn in a field
Some plants have stems that store water. These plants can also conduct photosynthesis with almost no leaves. In which habitat would these adaptations help the plant survive?
A. desert
B. grassland
C. rainforest
D. swamp
A. desert
How do ash clouds from volcanic eruptions directly affect the resources needed to sustain plants and animals within an ecosystem?
A. They decrease precipitation, causing soil erosion.
B. They block sunlight so it does not reach producers.
C. They stabilize soil, causing increases in nutrient levels.
D. They reduce temperatures in the atmospheric layer closest to Earth’s surface.
A. They decrease precipitation, causing soil erosion
How do decomposers get the energy they need to survive?
by feeding on dead organisms
This diagram shows a simple food chain.
sun → grass → grasshopper → bird → fox
Which organism has the least amount of available energy?
A. grass
B. grasshopper
C. bird
D. fox
D. Fox
Which abiotic factor in tundra and desert environments could affect the survival of an organism?
A. competition for space
B. competition for food
C. mild temperatures
D. lack of water
D. lack of water
This is a food chain for a mountain stream habitat.
sun → plant → dragonfly → crayfish → smallmouth bass → hawk
How will the removal of dragonflies from the food chain affect the other organisms in the habitat?
A. The number of hawks will increase.
B. The number of plants will decrease.
C. The number of crayfish will decrease.
D. The number of smallmouth bass will increase.
C. The number of crayfish will decrease.
Define Food Web
A food web is a series of food chains that show the movement of energy throughout an ecosystem.
Which of these shows the correct flow of energy through an ecosystem?
A. grasshopper hawk bacteria grass
B. grass grasshopper hawk bacteria
C. hawk bacteria grass grasshopper
D. bacteria grass grasshopper hawk
B. grass grasshopper hawk bacteria
Which best describes the transfer of energy through food webs?
A. Energy from animals is recycled among herbivores and carnivores.
B. Energy from plants is transferred from decomposers to consumers.
C. Energy from animals is recycled from decomposers to consumers and then to producers.
D. Energy from plants is transferred to consumers, and then from producers and consumers to decomposers.
D. Energy from plants is transferred to consumers, and then from producers and consumers to decomposers.
Which is a factor that will negatively affect the growth of plants in a
desert biome?
A. a decrease in available water
B. an increase in soil nutrients
C. a decrease in disease-causing bacteria
D. an increase in hours of available sunlight
A. a decrease in available water
Which is a biotic factor that could affect the rose bushes in a garden?
A. bees pollinating the rose bushes
B. a drought that limits rainfall on the rose bushes
C. the type of soil that the rose bushes are planted in
D. the amount of sunlight that shines on the rose bushes
A. bees pollinating the rose bushes
Define Food Chain
A snapshot of a single string of organisms that show the movement of energy throughout an ecosystem
In a food web, which organisms have the most energy available to them?
producers
Which correctly describes a primary consumer?
A. They eat producers.
B. They eat other animals.
C. They make their own food.
D. They decompose dead animals.
A. They eat producers.
Which is an abiotic limiting factor?
A. disease
B. flooding
C. parasites
D. predators
B. Flooding
Why are most of the plants in marine and freshwater biomes found close to the surface?
A. Sunlight cannot reach deeper water.
B. Temperatures become cooler in deeper water.
C. Carbon dioxide levels are higher near the surface.
D. Aquatic animals are more abundant near the surface.
A. Sunlight cannot reach deeper water.
Define Carrying Capacity
The sweet spot, the right number of species of populations that the ecosystem can self sustain.