3.11 Energy and Food Webs

This diagram shows a food web.

In any food web, what is the SOURCE of ENERGY for all of the organisms?

• the sun

• plants

• decomposers

• consumers

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What are plants called in a food chain?

• Producers
• Consumers
• Decomposers
• Scavengers

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What are the two main reasons that all plants and animals need food?

• To release energy into the environment

• To obtain energy for bodily functions

• To be part of the food chain

• For growth and repair

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What is the main role of decomposers in maintaining an ecosystem?

• They break down plant and animal remains and recycle the materials.

• They provide food for other organisms in a food web.

• They take in the energy of sunlight.

• They prey on small organisms in the soil.

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Which statement about a turtle's energy source is true?

• A turtle relies indirectly on the sun as an energy source.

• A turtle performs photosynthesis to gain its energy.

• Nutrients in the water are the ultimate source of energy for a turtle.

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Why are decomposers essential for maintaining an ecosystem?

• They break down plant and animal remains and recycle the materials.

• They provide food for other organisms in a food web.

• They convert the energy of sunlight into useful forms.

• They prey on insects that destroy plants.

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Which statement about a penguin's energy source is true?

• A penguin relies indirectly on the sun as an energy source.

• A penguin performs photosynthesis to gain its energy.

• Nutrients in the water are the ultimate source of energy for a penguin.

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Which statement about a fish's energy source is true?

• A fish relies indirectly on the sun as an energy source.

• A fish performs photosynthesis to gain its energy.

• Nutrients in the water are the ultimate source of energy for a fish.

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In the process of (a)   , plants capture energy from (b)   . Plants use this energy to combine (c)   and water. The products are food for the plant, a type of sugar called

(d)   . The plant also releases a type of gas called (e)   .

• photosynthesis
• sunlight
• carbon dioxide
• glucose
• oxygen

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Which processes add oxygen to the atmosphere and which processes remove oxygen?

Drag and drop each process to the correct group.

Groups:

(a) Adds Oxygen

,

(b) Removes Oxygen

• burning fossil fuels

• photosynthesis

• burning wood

• breathing

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