The food web shows grass, a grasshopper, a mouse, a frog, a snake and a hawk. What is the role of the grasshopper in this web?

In the web shown, a fungal disease kills nearly all of the frogs in one season. What is the most likely immediate effect on the snake population?

In the web shown, which organism feeds at the highest trophic level?

The stream web shows algae, mayfly larvae, minnows, a frog, a trout, a heron, and bacteria and fungi. Which organisms in it are the decomposers?

In the web shown, arrows run from the algae and from the heron to the bacteria and fungi. What do those two arrows represent?

In the web shown, a chemical spill kills almost all of the algae. Which population is affected first, and how?

The woodland web shows oak leaves, a caterpillar, a squirrel, a songbird, a fox, an owl and fungi. What is the role of the fox in this web?

In the web shown, how many organisms feed directly on the oak leaves?

In the web shown, arrows run from the fox and from the owl to the fungi. If the fungi were removed from this woodland, what would happen over time?

In the ocean web shown, what does the arrow drawn from the phytoplankton to the zooplankton represent?

The ocean web shows phytoplankton, zooplankton, small fish, squid, a seal and an orca. Which of them is the producer?

In the web shown, overfishing removes nearly all of the small fish, while squid numbers stay steady. What is the most likely effect on the seals?

In the savanna web shown, which animal is eaten by two different predators?

In the savanna web shown, a long drought kills most of the grasses. What is the most likely effect on the lion population over the next few seasons?

Energy enters the desert web shown at one organism. Which one is it?

In the desert web shown, follow the longest path of arrows from the desert shrub to the hawk. How many organisms lie between them on that path?

In the desert web shown, a fungal outbreak wipes out most of the beetles, while kangaroo rat numbers do not change. Which population is affected first, and how?

The pond web shows pond weed, water fleas, snails, a sunfish, a bass, a heron and decomposer bacteria. Which trophic level does the sunfish occupy?

Crayfish, which feed on dead plant and animal material on the pond bottom, move into the pond web shown. Which group already in the web would they compete with most directly?

In the pond web shown, a colony of herons settles on the pond and eats far more bass than before. What is the most likely effect on the sunfish population?

Looking at the farm web shown, a student says the arrow between the mouse and the barn owl means the mouse eats the barn owl. Why is that reading wrong?

In the farm web shown, farmers remove every rabbit from the field, while the corn and the mice are unchanged at first. What is the most likely effect on the coyotes?

The tundra web shows lichen, caribou, an arctic hare, an arctic fox, a snowy owl and a wolf. What is the role of the caribou in this web?

In the tundra web shown, the arctic hare and the caribou both feed on lichen. Which statement comparing their positions in the web is accurate?

A food web runs: seaweed -> sea urchin; seaweed -> snail; sea urchin -> sea otter; snail -> crab; crab -> gull. What is the role of the sea urchin?

A food web runs: wheat -> aphid; aphid -> ladybug; ladybug -> spider; spider -> sparrow; sparrow -> kestrel. Which organism is a tertiary consumer?

A food web runs: dead leaves -> earthworm; earthworm -> shrew; shrew -> owl; grass -> vole; vole -> owl. What role does the earthworm play in this web?

A web is drawn as: grass -> rabbit; rabbit -> fox; grass -> mouse. Field notes for the same meadow record owls hunting and eating the mice. Which new arrow should be added?

A food web runs: algae -> snail; snail -> crayfish; crayfish -> bass. Where does the energy that finally reaches the bass originally come from?

A food web runs: algae -> shrimp; shrimp -> herring; herring -> tuna. What happens to most of the energy at each arrow in this web?

A food web runs: kelp -> sea urchin; kelp -> abalone; sea urchin -> sea otter; abalone -> sea otter. Hunters remove nearly all of the sea otters. What is the most likely effect on the kelp?

A food web runs: oak acorns -> mouse; oak acorns -> deer; mouse -> fox; deer -> fox. A hard winter kills most of the deer. What is the most likely effect on the mice?

A food web runs: pond weed -> tadpole; tadpole -> dragonfly nymph; dragonfly nymph -> fish. If the tadpoles disappeared, the dragonfly nymph population would be expected to fall.

A food web runs: grass -> cricket; cricket -> shrew; shrew -> hawk; grass -> rabbit; rabbit -> hawk. Compare the two paths from the grass to the hawk. Which statement is accurate?

A food web runs: corn -> mouse; corn -> grasshopper; grasshopper -> mouse; mouse -> snake; snake -> hawk. Which organism eats both a producer and a consumer?

A food chain runs: phytoplankton -> copepod -> anchovy -> mackerel -> shark. About 10 percent of the energy passes on at each step. If the phytoplankton hold 10,000 kilograms of biomass, roughly how much would you expect at the shark level?

A grassland web shows grass, grasshoppers, mice, snakes and hawks, but no decomposers are drawn. If a group of soil bacteria and fungi were added, how should they be connected?

A food web runs: grass -> zebra; grass -> gazelle; zebra -> lion; gazelle -> lion; gazelle -> cheetah. A park manager removes every predator from the area. What is the most likely long-term result for the grass?

A food web runs: oak -> leaf litter; leaf litter -> springtail; springtail -> beetle; beetle -> shrew. Suppose every producer in this woodland died out. What would happen to the springtails and beetles?

A community with producers and consumers but no decomposers can still return nutrients from dead organisms to the soil.