Food Chains & Food Webs

Question 1

What is the ultimate source of energy in an energy pyramid or a food web?

Answer 1

the sun

Question 2

Sea otters move into the ocean bay. They eat all the sea urchins. This change will cause the–

Answer 2

sea ducks to have less food

Question 3

What correctly shows energy flow in the food chain?

Answer 3

plants –> insects –> salmon –> bears

Question 4

What three terms correctly describes a primary consumer?

Answer 4

Primary consumers are biotic, herbivores and often prey of larger animals

Question 5

What best describes the flow of energy as it passes throught the organisms in the pyramid?

Answer 5

Energy flows through the organisms from bottom to top and decreases at each level.

Question 6

Decomposers are important in the food chain because they–

Answer 6

break down dead organisms and recycle nutrients into the soil.

Question 7

In a pond, the primary producer is a green algae, Spirogyra; the primary consumer is the crustacean, Daphnia; the secondary consumer is a small fish, the bluegill; the tertiary consumer is a larger fish, the smallmouth bass. What changes can be expected in the pond if the Daphnia are killed with pesticides?

Answer 7

The smallmouth bass population will die.

Question 8

As organisms eat other organisms, energy and nutrients pass through various feeding levels. These feeding levels are called trophic levels. The following is a diagram of the energy and nutrient flow through a simple community. Which group would most likely contain living algae?

Answer 8

Producers

Question 9

nutrients from dead organisms are released into the soil by the action of ____________.

Answer 9

decomposers

Question 10

True or false: At each link in a food web, some energy is stored and some dissipates into the environment as heat.

Answer 10

True