LESSON 3: ENERGY IN ECOSYSTEMS

Lesson 3 Energy in Ecosystems

by Aicelle Velasco

Multiple Choice

All living things are made of _______, and all living things need _______. 

• matter, plants
• energy, matter
• matter, energy

Multiple Choice

Energy moves in a _______ and matter m in a _____

• cycle, cycle

• cycle, line

• line, line

• line, cycle

Multiple Choice

Why do you think energy cannot move in the cycle?

• some of the energy are released into the environment

• energy flow from the sun to the next organism

• the energy from the sun cannot return back to the sun

• all of the above

Multiple Choice

This organism draws its water from the ground, traps sunlight in its chlorophyll, and makes glucose (sugar) in broad green parts of its body. Is it a...

• Producer
• Consumer
• Decomposer

Multiple Choice

Which sentence correctly describes photosynthesis. (assume there is enough sunlight)

• CO₂ and water combine and make O₂ and glucose

• O₂ and water combine to make glucose and CO₂

• O₂ and CO₂ combine to make water and glucose

• CO₂ and glucose combine to make O₂ and water

Multiple Choice

A difference between photosynthesis and chemosynthesis

• Photosynthesis doesn't use light and chemosynthesis does

• Photosynthesis makes sugar and chemosynthesis doesn't

• Photosynthesis uses light and chemosynthesis doesn't

• Photosynthesis doesn't make sugar and chemosynthesis does

Multiple Choice

Breaks down and feeds on the remains of other organisms

• decomposer

• consumer

• producer

Multiple Choice

These organisms cannot make their own food; they must eat something for energy

• decomposer

• consumer

• producer

Multiple Choice

herbivores like to eat?

• meat

• grass

• meat and grass

• pizza

Multiple Choice

carnivores eat?

• meat

• grass

• both meat and grass

• chocolate

Multiple Choice

feed on plant and animal remains and other dead matter

• detrivore

• decomposers

• omnivores

• herbivores

Multiple Choice

The direction of the flow of energy in a food web is represented by ___.

• Light bulbs
• Dotted Lines
• Arrows
• Bubbles

Multiple Choice

A connection of food chains with many food energy paths in an ecosystem is a ____________

• ecosystem

• food web

• environment

Multiple Choice

Use the diagram to answer the question.
The Mayfly is a food source for which 3 organisms?

• Frog, Dragon Fly and snake

• Frog, trout and dragon fly
• Frog, salamander and trout
• Frog and phytoplankton

Multiple Choice

What is a food chain?

• The flow of energy from one thing to another

• The way animals eat each other

• The way the sun makes everything

• How the plants grow

Multiple Choice

Which of these is a possible food chain for this environment?

• Sun → grass → fly → frog

• frog → fly → grass → Sun

• Sun ← grass ← fly ← frog

• Sun → fly → frog → snake

Multiple Choice

Trophic levels are represented by 

• squares
• circles
• pyramids
• lines

Multiple Choice

In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%
• 90%
• 10%
• 20%

Multiple Choice

If a primary consumers have 650 kcals of energy available to them in the producers they eat, how many kcals of energy make it into the primary consumer trophic level?

• 6.5

• 65000

• 650

• 65

Multiple Choice

An owl eats a rat that lived in an ecosystem where there was 2,800 kcals of energy in the insect population that the rat consumed. How many kcals would transfer to the trophic level the owl is in?

• 28

• 280

• 2,800

• 28,000

Multiple Choice

What would happen to the bird if the green fish died out?

• the bird population would grow

• the bird population would die out

• the smaller fish will die out

Multiple Choice

What percent energy from the producers is available to primary consumers?

• 25%

• 12%

• 8%

• 10%

Multiple Choice

In the energy pyramid below, which organism has the least amount of energy available?

• Producers

• Herbivores

• Carnivores

• Top Predator