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Study workbooks, textbook, vocab, packet 3.3

Trophic level pyramid

• When filling in your pyramid, in order to know which trophic level an organism goes in, you need to know WHAT the organism ate, all the way back down the food chain.

• Example 1: A bug eats some algae. The bug is a __________ consumer. (primary)

Trophic level pyramid

• Example 2: A fish eats a bug that ate some algae. The fish is a ________________ consumer.

(secondary)

Trophic level pyramid

• Example 3: A bird eats a fish that ate a bug that ate some algae. The bird is a ____________ consumer(tertiary)

Trophic level pyramid

• Example 4: A bird eats a bug that ate some algae. The bird is a __________________ consumer.

(secondary)

•*Some animals can fill in more than 1 trophic level

Trophic level pyramid

• Example 5: A bobcat eats a bird that ate a fish that ate a bug that ate some algae. The bobcat is a _________________ consumer.(quaternary)

Review of 3.3 – PAGE 2

• 1. What travels through a food chain or web?

• Energy (or biomass)

Review of 3.3

• 2. What is the ultimate energy source for all life on Earth?

• Sunlight (or chemical energy)

Review of 3.3

• 3. Food chains start with what?

• Producers (Autotrophs)

Review of 3.3

• 4. The 1st organism in a food chain must always be what type of organism?

• Primary producers

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• 5. Name 2 food making processes

• Photosynthesis, chemosynthesis

Review of 3.3

• 6. Where do chemosynthetic bacteria get their energy?

• Chemicals found in hydrothermal vents

Review of 3.3

• 7. Define herbivore.

• Animal that eats only plants or plant products (seeds, leaves, stems, roots)

• 8. Herbivores are also called…

• Primary consumers

• 9. What are animals called that feed on herbivores?

• Secondary consumers (can we say if they are omnivores or carnivores?)

• 10. Secondary consumers are eaten by larger ______________.

• predators

• 11. _________ consumers eat secondary consumers.

• Tertiary

• 12. Make a food chain with a producer and 3 consumers

• Grass Grasshopper Rat Snake

REVIEW PAGE 4

• 1. What is used to indicate the flow of energy in a food chain or web?

• Arrows

• 2. What happens to energy as we move from step to step in a chain or web?

• It is transferred, and some energy is lost

• 3. Define food web

• A network of many food chains

Review of 3.3

• 4. What is meant by “trophic levels”?

• The position an organism holds in a food chain or web

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• 5. Define autotroph

• Organisms that make their own food from sunlight or chemical energy from deep sea vents

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• 6. The 1st trophic level consists of ____ producers called ____.

• Primary producers, autotrophs

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• 7. Name the 2nd trophic level (both names)

• Primary consumers, herbivores

Review of 3.3• 8. Secondary consumers may be ____

eating meat or _____ that eat both plants and animals.

• Carnivores, omnivores

Review of 3.3

• 9. What is the 3rd trophic level called?

• Secondary consumers

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• 10. What is the 4th trophic level called?

• Tertiary consumers

Review of 3.3

• 11. At the 5th trophic level would be _____ consumers that eat _____ consumers.

• Quaternary, tertiary

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• 12. Give an example of 3 detritivores. On what do they feed?

• Worms, shrimp, snails, mites

• Feed on already decayed organisms

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• 13. What organism feeds on dead plants and animals and helps recycle them?

• Decomposers

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• 14. Both _____ and ______ act as decomposers• Bacteria and fungi

Review 3.3

• 15. Can an organism fill more than one trophic level--- yes or no? Give an example

• Yes – an organism like a raccoon (last page food web) is listed as a tertiary consumer, but it can also be considered a secondary consumer if it eats a primary consumer (a tiny fish, grub, or grasshopper)

Page 5 Review• 1. In food chains and webs, what trophic level

must you have more of than others?• Producers!• 2. Each trophic level has how much LESS energy?• 10% less• 3. What may happen if a species goes extinct?• It affects the entire food web (think of your

food web activity)

Review of 3.3

• A plant is …

A. An autotroph

B. A heterotroph

C. A primary producer

D. A and C

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• A person who eats a chicken that ate grain is a…

A. Primary producer

B. Primary consumer

C. Secondary consumer

D. Tertiary consumer

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• Primary consumers eat

A. Primary producers

B. Primary consumers

C. Secondary consumers

D. Quaternary consumers

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• A cow is a

A. Primary consumer

B. Heterotroph

C. An herbivore

D. All of the above

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• Autotrophs…

A. Make their own food

B. Are the base of the food chain

C. Are primary producers

D. All of the above

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• A lion that eats a zebra that ate grass is…

A. A primary producer

B. a primary consumer

C. a secondary consumer

D. a quaternary consumer

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• A heterotroph…

A. is an autotroph

B. eats other organisms

C. is a primary producer

D. A and C

E. None of the above

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• A detritivore

A. is an autotroph

B. eats decomposing matter

C. kills animals

D. all of the above

E. none of the above

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• If a person eats a vegetable, the person is acting as

A. A primary producer

B. A primary consumer

C. A secondary consumer

D. A tertiary consumer

E. A quaternary consumer

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• As nutritional energy passes through the food chain, energy…

A. Is lost

B. Is gained

C. Remains constant

D. Increases then decreases

E. Decreases then increases

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• There are more primary producers than there are…

A. Primary consumers

B. Secondary consumers

C. Tertiary consumers

D. Quaternary consumers

E. All of the above

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• The network of all the inter-related food chains in a biological community is called

A. A food web

B. A food chain

C. A food pyramid

D. A ecological experiment

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• The sequence of who eats whom in a biological community is called

A. A food web

B. A food pyramid

C. A food chain

D. A trophic level

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• An organism that gets its energy by eating other organisms is called

A. An autotroph

B. A primary producer

C. A heterotroph

D. A consumer

E. C and D