Environmental Changes

Front

Using the diagram, which statement is MOST likely true? A. The Sun directly provides energy to the heron. The oysters find shelter in the cordgrass. The marsh crab uses the terrapin for food. The cordgrass provides shelter for the periwinkle snail.

Back

The cordgrass provides shelter for the periwinkle snail.

Front

Which best describes the result if the number of lily pads in a pond ecosystem increases?

Back

Consumers of the lilypads would increase because of a larger food source.

Front

Which two organisms in the food chain shown below are carnivorous?

grass --> mice-->snakes--> hawks

Back

snakes and hawks

Front

For many years, farmers used a chemical called DDT to kill insects in their crops. Gradually, the chemical made its way into streams, rivers, and lakes. After DDT had been used for several years, bald eagles began laying eggs with very thin shells and became endangered. Which is most likely a reason why this happened to bald eagles?

Back

The fish they ate had pesticides in them.

Front

Which effect will an increase in sea urchins MOST likely have on this food web?

Back

a decrease in the amount of seaweed

Front

The seed shown grows on a short plant. The seed is covered by small points that can stick to other objects. Which will MOST likely transport this seed to a new location?

Back

being carried by an animal

Front

A pond has become overgrown with algae. The fish and plants in the pond are beginning to die. Which human activity would most likely be responsible for the decrease in pond life? Options: people throwing garbage near a road, logging companies cutting trees in forests, factories producing smoke that pollutes the air.

Back

farmers using excess fertilizers on crops

Front

Flamingos are tall birds that live in warm places near the sea. Most flamingos have white feathers that turn pink. Which BEST shows that a flamingo’s pink color comes from its environment?

Back

A flamingo that eats only white food has a white color.

Front

What is the MOST likely reason the crab needs the ocean to survive?

Back

The crab needs the salt water.

Front

Which best explains why the sun is important to all ecosystems?

Back

Producers rely on it to make their food.