Question

food webs
are food chains good enough?
do food chains provide all the information we need?

we can use a food chain to identify autotrophs (or producers) and heterotrophs (or consumers). but can we really use it as a way of classifying organisms as omnivores, carnivores, and herbivores? it may still not give a good depiction of how matter and energy is transferred within an environment.

take a closer look and collect evidence around the eating patterns of a grizzly bear. why might a food chain not be the best way of representing the transfer of nutrients and energy in an environment?

check all that apply.

☐ a food chain only lists the producers.
☐ there is only one consumer in the entire food chain.
☐ food chains don’t show the different types of food sources available in the environment.
☐ a food chain does not clearly display the food sources for organisms that gather nutrients from more than one food source.
☐ a food chain does not show where all of an organism’s energy comes from.

images: a bear roaring with click on the bear roaring to see more.; a bear eating with click on the bear eating to see more.

Explanation:

• Option A: Food chains include producers and consumers, so this is incorrect.
• Option B: Food chains can have multiple consumers, so this is incorrect.
• Option C: Food chains focus on a linear sequence of who eats whom and don't show all available food sources in the environment, so this is correct.
• Option D: For omnivores (like grizzly bears) that have multiple food sources, a food chain (linear) doesn't clearly show all their food sources, so this is correct.
• Option E: Since a food chain is linear, it doesn't show all the energy sources (multiple food sources) of an organism, so this is correct.

Answer:

C. Food chains don't show the different types of food sources available in the environment.
D. A food chain does not clearly display the food sources for organisms that gather nutrients from more than one food source.
E. A food chain does not show where all of an organism’s energy comes from.