Food Webs

What do producers need to make their own food?

• Heat, carbon dioxide, and water

• Sunlight, oxygen, and water

• Heat, carbon dioxide, and oxygen

• Sunlight, carbon dioxide, and water

The diagram shows a grassland food web. 

The grassland ecosystem is experiencing a drought where very little 

rain has fallen for many years. 

How would the organisms in the grassland ecosystem be affected 

by the drought?

• There would be fewer shrubs 

  and there would be more deer.

• There would be fewer numbers of 

  each type of organism.

• There would be more numbers of 

  each type of organisms.

• There would be fewer hawks and 

  there would be more mice.

Look at the food web of a pond ecosystem.

Which food chain shows the correct flow of energy in the pond 

of the food web?

Look at the desert food web.

What organism will possibly die out if the feather grass were removed from the desert?

• Jackrabbit

• Grasshopper

• Desert tortoise

• Desert fox

The illustration demonstrates the relationship between plants, their environment, and the Sun. The plant uses the energy from the sunlight to produce glucose from carbon dioxide and water, while oxygen is also produced and released.

What is the purpose of this process?

• Producers making their own food

• Consumers making their own food

• Producers consuming carnivores

• Producers consuming herbivores

The food web shows interactions in a forest environment.

What statement about the interactions within the forest is correct?

• Carpenter ants are producers.

• Lichen are not producers.

• Voles do not get energy from owls.

• Black-tailed deers will not get energy from berries.

The leaves of most plants make food, using the Sun's energy, for the plant to grow. But leaves can cause a plant to lose water. This can cause the leaves to wilt, and the plant could die. Which of the following plants has leaves that are BEST adapted to prevent water loss in hot, dry climates?

Look at the picture of the forest.

What prevents the small trees in the forest from growing larger?

• Less rain reaches the smaller trees.

• Less sunlight reaches the smaller trees.

• Less soil reaches the smaller trees.

• Less rain, sunlight and soil reaches the smaller trees.

A grassland food web is shown.

How many organisms obtain their energy only from producers?

• 3

• 4

• 5

• 6

These two species of birds, the egret and heron, eat the same types 

of fish as their maindiet. They live in the same ecosystem. 

How would the egrets in this area MOST LIKELY respond if all of the herons were removed from the area?

• They would move to different ponds.

• They would change to another diet.

• They would build fewer nests.

• They would have an increase in population.