Science Unit 2 Test

Wildfires can have both positive and negative effects on an environment. Which would be considered a positive result following a wildfire in an area?

• Habitats of many animals are destroyed during the wildfires.

• Some plants and animals perish during the wildfires.

• The fire can alter the environment’s ability to sustain life.

• New plants and organisms can begin to grow and thrive in the environment.

Extreme effects of environmental changes test the adaptability of organisms and their ability to —

• fly

• thrive

• swim

• perish

What event most likely caused changes to the environment in the graphics below?

• Flood

• Tornado

• Drought

• Thunderstorm

In times of severe environmental change such as flooding and droughts, what advantage do animals have that plants do not?

• Animals do not have an advantage over plants.

• Animals reproduce and make more of their kind when the environment changes.

• Animals have structures that help them survive, but plants do not.

• Animals have the ability to move out of a situation, but plants are anchored.

Which is NOT an environmental change that will affect the survival of organisms?

• Flood

• Plane landing

• Drought

• Volcanic eruption

Which sentence best describes the environmental changes caused by a flood?

• Earth gets dry and soil blows away.

• Earth wears down and breaks apart.

• Burned forests make room for new plant growth.

• Areas normally dry become covered in water.

As winter gets closer there are cooler temperatures and less sunlight during the day. As a result, trees —

• grow taller

• lose leaves

• 
  grow leaves

• 
  get shorter

Canadian Geese and many other birds migrate to different climates when

• 
  the wind blows harder

• temperatures get cooler

• 
  the flowers begin to bloom

• rain clouds fill the sky

A flower growing in a pot changed after two weeks. The plant most likely changed because it needed more -

• 
  Insects

• Noise

• 
  Darkness

• 
  Water

The main source of energy for the food chain is the —

• mouse

• grass

• snake

• Sun