Food Chains and Food Webs STAAR Questions

A chart lists organisms in five different categories living near the Texas Gulf Coast.

Based on the chart, which food chain best models a flow of energy in this ecosystem.

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A partial grassland food web is shown.

Which of the following best describes a relationship in this grassland?

• Badgers are top predators because they eat upland sandpipers and beetles.

• A producer-consumer relationship exists between lupines and ants.

• A predator-prey relationship exists between beetles and ground squirrels.

• Upland sandpipers are primary and secondary consumers because they eat grasses and grasshoppers.

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An energy pyramid is shown.

Which sentence best describes how energy flows through this pyramid?

• Energy is transferred down each level of the energy pyramid.

• The energy lost at each level is consumed by organisms in the top level.

• Energy is transferred from organisms in one level to those in the level above.

• The organisms at the bottom level provide energy directly to organisms in all the other levels.

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A partial mountain forest food web is shown below.

Which statement does NOT describe a relationship shown in the food web?

• Elk are prey for mountain lions.

• Mice are herbivores that consume grasses and are preyed on by snakes.

• Owls prey on rabbits and frogs.

• Rabbits consume shrubs and are parasites of grasses.

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A partial marine food web is shown.

Which organisms all consume the same producer?

• crabs, pilchards, blennies

• euphausiids, sweeps, water fleas

• tiger sharks, dolphins, octupuses

• sea urchins, crabs, octopuses

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A partial food web is shown. The numbers in the boxes represent animals in the food web.

Which organisms have three carnivorous predators and a consumer-producer relationship with at least one organism?

• the organisms that fit in boxes 2, 3 and 7

• the organisms that fit in boxes 5 and 7

• the organisms that fit in boxes 4 and 6

• the organisms that fit in boxes 2 and 7 only

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Many Texas caves provide a habitat for animals that live in total darkness. The caves are damp and cool, and most of the caves are rich in mineral calcite. The diagram below shows the relationships of some organisms involved in a cave ecosystem.

Based on the diagram, which of the following statements is valid?

• Owls are predators of bats, and bats are predators of moths.

• Beetles compete with bats and cave spiders.

• Snakes prey on bats and owls.

• None of the above

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The partial food web shown below is found in an aquatic environment. This type of environment has many organisms in the same trophic levels.

Which two types of organisms in this aquatic food web have a producer-consumer relationship?

• microscopic algae and white suckers

• small invertebrates and amphipods

• phytoplankton and mummichogs

• amphipods and channel catfish

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Some students are studying the relationships between organisms in a food web.

How many predators shown in this food web are omnivores?

• 1

• 2

• 3

• 4

Which of these correctly describes a relationship between organisms in the soil food web?

• protozoa get nutrients from small arthropods

• mammals are predators of birds

• nematodes prey on arthropods

• bacteria get nutrients from organic matter

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