B12C

Which of the following are missing from the food web shown above?

• producer

• decomposers

• omnivores

• predators

The Texas blind salamander (Eurycea rathbuni) lives in the Edwards Aquifer region around San Marcos. Along with other species the salamander lives in total darkness in the underground crevices and caves of the aquifer region. The table lists some of the organisms that live in this environment and their food sources. In the energy pyramid for these aquifer cave dwellers, which of the following would be placed at the bottom?

• snails

• blind shrimp

• protozoa

• Texas blind salamander

A marine ecosystem is represented below. What is lost to the environment at each of the trophic levels of this ecosystem?

• nutrients from the soil

• living space for the organisms

• food sources

• heat

A terrestrial food web is shown below. Which of the following lists only organisms that are secondary consumers in this food web?

• mice, rabbits, herbivorous insects, and squirrels

• predaceous insects, toads, spiders, and foxes

• spiders, foxes, owls, hawks, and snakes

• insectivorous birds, seed eating birds, owls, and hawks

The food web shows the flow of energy through a sagebrush steppe ecosystem. Which of these organisms are in a trophic level that receives a larger percentage of the energy captured by the producers than the percentage received at the bats trophic level?

• mountain lions

• snakes

• hawks

• ground squirrels

A student is asked to draw a food web in which teh same organism is a primary consumer as well as a secondary consumer. How should the organism be represented in the food web?

• the organism must have an arrow pointing from it to a tertiary consumer and another arrow pointing from it to a decomposer

• the organism must have an arrow pointing from it to a secondary consumer and anther arrow pointing to it from the top predator

• the organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer

• the organism must have an arrow pointing from it to a primary consumer and another arrow pointing away from it to a decomposer

The amount of energy the producers in this energy pyramid provide the primary consumers is 54,000 joules. From this amount 540 joules are provided to the tertiary consumers. Based on this model, how much of the energy was provided to secondary consumers?

• 53, 460 J

• 5,400 J

• 540 J

• 54 J

Part of the hydrothermal vent food web is represented in the diagram. Which organisms are both secondary and tertiary consumers in this food web?

• chemosynthetic bacteria and amphipods

• zooplankton and mussels

• ratfish and octopuses

• galatheid crabs and zoarcid fish

The energy pyramid below shows the energy made available by producers. Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?

• 100 J

• 500 J

• 1,000 J

• 50 J

The diagram shows a partial East Texas food web. Which table correctly classifies the organisms?

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