Organisms
Food Chains and Webs
Changes in Ecosystems
Organisms and the environment
Features
100
A living organism that shapes its ecosytem.
What is an biotic factor?
100
All food chanins need these organisms
What are producers?
100
A student makes a model of an energy pyramid, as shown in the image.
The student wants to place rabbits, grasses, snakes, and eagles in the pyramid. At which level should the student place grasses?
What is level M?
100
What is the source of almost all energy on the Earth?
What is the sun?
100
A student listed the characteristics of a few environments.
In which environment is a cactus most likely found?
What is environment 2?
200
Plants need these three things to survive.
What is water, sunlight and carbon dioxide?
200
Ghost crabs are a species of crab that are a main food source for sea birds found along the Outer Banks.
Which event would most likely happen if there was an increase in the seagull population in the same area?
What is a decrease in the ghost crab population?
200
The table shows the population sizes of several organisms in a grassland.
Which population is likely to decrease due to a change in food source if the wildebeest population is removed from the grassland?
What is the lion?
200
The image shows an overhead view of a section of land.
Which human action most likely led to the development of the land in this way?
What is agriculture or farming?
200
Which feature of an aquatic ecosystem makes it a lake rather than a pond?
a. It is a body of freshwater.
b. The water body is surrounded by land.
c. The water temperature differs greatly with depth.
d. It has organisms living only in the shallow region.
What is C. The water temperature differs grealty with depth.
300
This organism only eats plants.
What is a herbivore?
300
A simple food web of a mountain ecosystem is shown in the diagram.
What explains the immediate effect of removing the elk population from the ecosystem?
What is a decrease in the lion population?
300
The diagram shows a wetland food web.
Regular fishing by humans reduces the number of blue crabs and catfish in the food web. What long-term effect will this change have on the other organisms in the food web?
What is a decrease in racoons and alligators?
300
A beaver builds a dam across a narrow part of a river to use as a lodge to raise its young.
How will the beaver’s dam impact the area?
What is flooding upstream?
300
The table shows characteristics of two ecosystems.
Ecosystem A best summarizes which land-based ecosystem?
What is a grassland ecosystem?
400
Plants need five things to grow
What is water, sunlight, carbon dioxide, nutrients and space?
400
Mushrooms's niche in an ecosystem
What is decomposers and to break down dead and decaying organisms?
400
The image shows a food web.
What immediate effect would occur in the food web if all of the quails are removed from the ecosystem?
What is a decrease in mountain lions and coyotes?
400
This organism is killing native fish in North America?
What is the Asian Carp?
400
Cattle feed on grasses. Too many cattle feeding in one area removes grasses and makes the topsoil loose.
How do cattle impact the area where they feed?
a. Removing grasses increases soil erosion.
b. Removing grasses decreases soil erosion.
c. Feeding decreases rocky topsoil.
d. Feeding increases rocky topsoil
What is A. Removing grasses increase soil erosion?
500
This organsim is at the top of the food pyramid
What is an Apex predator?
500
The list shows how different organisms in a pond habitat obtain energy.
Which food chain correctly represents the energy flow in the pond habitat?
What is algae, snail, catfish, and herons?
500
The diagram shows a food web of a grassland ecosystem.
What type of change in the rabbit population will be observed if the population of roadrunners decreases?
What is no change to the rabbit population?
500
The emerald ash borer
What is an invasive species that is killing Ash trees in North America?
500
A small, clear puddle of water was created in an empty patch of land after a storm. What is the most visible abiotic component of the puddle?
What is water?