Here is the step-by-step solution to complete your worksheet.
Part 1: Labeling the Food Web
To label the food web correctly, we need to look at what each group of animals eats. The arrows in a food web point from the food source to the animal that eats it.
1.
Bottom Level (Plants, Flowers, Nuts, Seeds, Fruit, Insects):
* These organisms create their own energy (mostly from sunlight) or are the base of the food chain.
*
Label: producers
2.
Second Level (Pika, Red-breasted nuthatch, Pacific tree frog, Edith's checkerspot, Douglas's squirrel, Mule deer):
* Look at the arrows pointing to these animals. They all come from the "producers" level. Animals that eat producers are called primary consumers.
*
Label: primary
3.
Third Level (Ringtail, Western whiptail, Raven, Black-tipped jackrabbit, Pine marten):
* These animals eat the primary consumers (herbivores). For example, the Raven eats the squirrel (a primary consumer). Animals that eat primary consumers are secondary consumers.
*
Label: secondary
4.
Top Level (Coyote, Mountain lion, Bobcat):
* These large predators eat other carnivores or omnivores. For example, the Mountain lion eats the Coyote. Animals at the top of the chain that eat secondary consumers are tertiary consumers.
*
Label: tertiary
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Part 2: Complete the Sentences
Let's look at the definitions to choose the right word for each sentence.
*
a) Producers provide the energy for the entire ecosystem. Without them, no one else could survive.
*
Answer: most
*
b) Organisms that make their own energy from sunlight are called autotrophs (like plants). Heterotrophs must eat others for energy.
*
Answer: autotrophs
*
c) Herbivores, omnivores, and carnivores cannot make their own food; they must eat. Therefore, they are heterotrophs.
*
Answer: heterotrophs
*
d) Biomass refers to the total mass or amount of living material (energy storage) in an ecosystem. Decomposition is the process of breaking down dead things.
*
Answer: energy
*
e) As seen in the web, everything is linked by arrows. If you remove one part, it affects the others.
*
Answer: are
*
f) Primary consumers usually only eat plants (prey). Secondary consumers eat animals, meaning they are predators, but they can also be eaten by larger animals (prey).
*
Answer: Secondary
*
g) Decomposers (like fungi and bacteria) break down dead organic matter and return nutrients to the soil for plants to use. Tertiary consumers are just top-level hunters.
*
Answer: Decomposers
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Final Answer:
1. Use the vocabulary to label the food web:
* Top box (next to Coyote/Mountain Lion/Bobcat):
tertiary
* Second box from top (next to Ringtail/Raven/Pine marten):
secondary
* Third box from top (next to Pika/Squirrel/Deer):
primary
* Bottom box (next to Plants/Flowers):
producers
2. Complete the sentences:
* a)
most
* b)
autotrophs
* c)
heterotrophs
* d)
energy
* e)
are
* f)
Secondary
* g)
Decomposers
Parent Tip: Review the logic above to help your child master the concept of food web activity worksheet.
