Unit 1 Web of Life

What is the primary source of energy in the food chain shown in the image?

• The Sun

• Green plants

• Triceratops

• Tyrannosaurus Rex

According to scientists, what event is believed to have caused the extinction of dinosaurs?

• An asteroid hitting the Earth

• A volcanic eruption

• A massive flood

• A severe drought

Why did carnivorous dinosaurs go extinct without the Sun?

• They couldn't find water

• They couldn't find shelter

• They couldn't get energy from plants

• They couldn't breathe

What can the energy of every organism be traced back to?

• The Moon

• The Sun

• The Earth

• The Stars

What happens to squirrels if all the oak trees suddenly disappear?

• They will have plenty to eat.

• They will not have anything to eat.

• They will eat more earthworms.

• They will become decomposers.

What will happen to the robins if a frog is added to the environment?

• They will have more food.

• They will not have anything to eat.

• They will eat the frogs.

• They will eat more crickets.

Where do plants mostly get the materials they need to grow?

• From the soil.

• From the water.

• From the air.

• From other plants.

How does air enter a plant?

• Through the roots.

• Through tiny holes in their leaves.

• Through the stem.

• Through the flowers.

What is the role of decomposers in a food web?

• They produce energy for the ecosystem.

• They consume primary consumers.

• They break down dead organisms and recycle nutrients.

• They are at the top of the food chain.

What is the main difference between a food chain and a food web?

• A food chain is more complex than a food web.

• A food web shows multiple interconnected food chains.

• A food chain includes decomposers, while a food web does not.

• A food web is linear, while a food chain is not.