In the food web shown, which path carries energy from grass to the hawk through the greatest number of feeding steps?

Use the web shown. Which organism gets energy from minnows and is then eaten by another organism?

Starting with oak leaves in the web, which sequence correctly traces energy to the owl?

In the web shown, which organism receives energy from krill through two different prey species?

Which chain shown transfers energy from prairie grass to the coyote?

Trace the arrows in the web. Which organism can receive energy from a berry bush by more than one route?

In the shown web, which route has exactly four arrows from the producer to the top predator?

Follow the arrows from corn to aphids to lady beetles. Which organism do the arrows reach next?

In the food web, which path shows energy moving from a producer to the snake?

Following the arrows from maple seeds, which organism is furthest downstream in the web?

A disease greatly reduces rabbits in the web shown. What is the most immediate effect on foxes that eat rabbits?

In the web shown, a pesticide removes most caterpillars. Which population is most likely to decline first?

Sea otters are removed from the kelp-forest web. What change is most likely to occur first?

Suppose nutrient runoff causes an algal bloom in the pond web. Which population has the most direct potential to increase while algae are abundant?

In the prairie web, hawks are added to the ecosystem and eat lizards. What is the likely initial effect on grasshoppers?

A drought sharply reduces grass in the web shown. Which pair of populations is most directly affected by reduced food availability?

In the marine web, overfishing greatly reduces fish. Which predator loses a direct food source?

A conservation program increases wolf numbers in the web. What is the likely initial change in deer abundance?

In the farm web, insecticide reduces lady beetles. What is the most likely short-term response of aphids?

Invasive rats reach the island. Based on the food web, which population is most likely to decline first?

A fungal disease reduces oak trees in the forest web. Which consumer is most likely to decrease because its direct food source declines?

In the desert web, snakes are extirpated. What is the most likely immediate response of mouse populations?

An arrow in the web points from grass to rabbit. What does that arrow represent?

In the pond web, the arrow from minnows to bass means what?

What does the arrow from caterpillar to warbler show in the forest web?

In the kelp-forest web, an arrow runs from sea urchin to sea otter. Which statement is accurate?

The web includes an arrow from krill to penguin. What is the direction of energy transfer?

In the farm web, why does the arrow point from aphid to lady beetle?

The arrow from rabbit to fox in the web identifies which relationship?

In the riparian web, an arrow runs from willow to deer. What does this indicate about deer?

Use the diagram. If the main herbivore in each system is lost, which predator is more likely to still have prey to eat?

A disease wipes out the rabbits in one system and the cottontails in the other. Which predator is more likely to persist?

What feature of the owl's food web, missing from the lynx's food chain, can soften the loss of one herbivore?

A contaminant sharply reduces the small-fish prey in both shown systems. Which predator faces the greater risk of losing all of its direct prey?

Which shown system gives its top predator more functional redundancy in its diet if one prey population declines?

After the grasshoppers and crickets are lost, which predator is more likely to keep up its numbers, and why?

Which statement correctly compares Chain A with Web B?

Compare the rabbit and the hare in the diagram. Which statement about their predators is correct?

A severe winter kills off the voles and the lemmings. Which prediction about the top predators is best supported?

A disease kills one herbivore species in each shown system. Which system is more likely to lose its top predator?