3.9AC - Ecosystems

These data tables give information on 4 habitats and the needs of a fox. Which habitat most closely meets the needs of the fox?

• Q

• R

• S

• T

Frogs often live in freshwater ponds where they feed on insects and lay their eggs in the water. Sometimes they are eaten by snakes. Frogs would leave the area if -

• there were more insects

• the snakes all died out

• the water in the pond dried out

• there was a little more rain

All of the following are changes to an environment that could help an animal thrive EXCEPT -

• more of the kind of plants an animal eats

• fewer predators that eat the animal

• less rain during the summer and spring

• removal of animals that eat the same food

How could a forest fire help some animals? A forest fire could help -

• remove the trees that birds use to create nests

• clear dead plants to allow new plants to grow

• scare away small mammals that are food for wolves

• burn the soil where worms live

The chart above shows population changes after a recent flood. The information in the chart shows that floods -

• are harmful to all species living in the habitat

• cause changes that help some species thrive

• result in large temperature changes

• make populations of most species increase

Some students set up an aquarium containing water, fish, and plants. Plants help support the survival of fish because they -

• remove nutrients from the soil

• use energy of sunlight

• absorb water from their surroundings

• add needed resources to the water

Some plants grow best in damp environments. During a severe drought, these plants will most likely -

• perish

• move

• grow

• thrive

When a hurricane comes ashore, it brings large amounts of saltwater with it. How might this affect the organisms in freshwater environments?

• the plants in the freshwater environment will move to a new location

• the number of organisms in the environment will increase

• animals in this environment will grow larger

• organisms that cannot survive in saltwater will not survive

How might cutting down the trees in a forest environment affect the animals that live there?

• all of the animals in the forest will perish in a short period of time

• animals that cannot find what they need will move

• the animals will move underground to find what they need

• most animals will eat different kinds of food to survive

The table above shows the basic needs of a robin. Which environmental change would be harmful to the survival of a robin?

• Praiire dogs digging tunnels in the ground

• Beavers building dams across streams

• humans clearing forests to build houses

• ants building large anthills in schoolyards