Food Web Assignment worksheet illustrating a food chain with organisms and questions about producers, consumers, and ecosystem relationships.

Food Web Assignment Solution

#### 1. For the food chain above, indicate the:
The given food chain is:
grass → grasshopper → frog → snake → eagle

Let's identify each component step by step:

- a) Producer:
Producers are organisms that produce their own food through photosynthesis. In this food chain, the grass is the producer.

- b) Primary (1st) consumer:
Primary consumers are herbivores that eat producers. Here, the grasshopper eats the grass, so it is the primary consumer.

- c) Secondary (2nd) consumer:
Secondary consumers eat primary consumers. The frog eats the grasshopper, so it is the secondary consumer.

- d) Tertiary (3rd) consumer:
Tertiary consumers eat secondary consumers. The snake eats the frog, so it is the tertiary consumer.

- e) Quaternary (4th) consumer:
Quaternary consumers eat tertiary consumers. The eagle eats the snake, so it is the quaternary consumer.

- f) Herbivore:
Herbivores are animals that eat plants. In this food chain, the grasshopper is a herbivore because it eats grass.

- g) First carnivore:
The first carnivore in the food chain is the animal that eats a herbivore. The frog eats the grasshopper, so it is the first carnivore.

- h) Top carnivore:
The top carnivore is at the end of the food chain and has no natural predators within this chain. The eagle is the top carnivore.

#### Final Answers for Part 1:
- a) Producer: grass
- b) Primary (1st) consumer: grasshopper
- c) Secondary (2nd) consumer: frog
- d) Tertiary (3rd) consumer: snake
- e) Quaternary (4th) consumer: eagle
- f) Herbivore: grasshopper
- g) First carnivore: frog
- h) Top carnivore: eagle

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#### 2. Complete each of the following food chains with an appropriate animal:

We need to complete the food chains by adding an appropriate animal to each sequence.

- a) In a woodlot:
leaves → worm → _______
Worms are often eaten by birds or small mammals. A common predator of worms in a woodlot could be a bird (e.g., robin) or a mole. Let's choose bird for this example.
Completed food chain: leaves → worm → bird

- b) In a pond:
algae → insect → _______
Insects in ponds are often eaten by fish. A common predator of insects in a pond could be a fish (e.g., trout).
Completed food chain: algae → insect → fish

- c) In a forest:
grass → rabbit → _______
Rabbits are preyed upon by various predators in a forest, such as foxes, coyotes, or hawks. A common predator of rabbits could be a fox.
Completed food chain: grass → rabbit → fox

#### Final Answers for Part 2:
- a) In a woodlot: leaves → worm → bird
- b) In a pond: algae → insect → fish
- c) In a forest: grass → rabbit → fox

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Final Answer Box:

\[
\boxed{
\text{1. a) grass, b) grasshopper, c) frog, d) snake, e) eagle, f) grasshopper, g) frog, h) eagle}
}
\]
\[
\boxed{
\text{2. a) bird, b) fish, c) fox}
}
\]