Food Web and Food Chain - ESL worksheet by LianSuzy - Free Printable

Problem Analysis and Solution

The worksheet provided focuses on understanding food chains and food webs. Let's break down each part of the worksheet and solve the problems step by step.

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#### Part 1: Food Chain Analysis

The given food chain is:
```
lettuce → greenfly → ladybug → thrush → cat
```

##### a. What does the arrow mean in a food chain?
- Answer: The arrow in a food chain indicates the flow of energy from one organism to another. Specifically, it shows that the organism at the start of the arrow provides energy (as food) to the organism at the end of the arrow.

##### b. Name the producer in the food chain.
- Answer: The producer is the organism that produces its own food through photosynthesis. In this food chain, the producer is lettuce.

##### c. Name the third trophic level in the food chain.
- Explanation: Trophic levels are the positions occupied by organisms in a food chain. The first trophic level is the producer (lettuce), the second trophic level is the primary consumer (greenfly), and the third trophic level is the secondary consumer.
- Answer: The third trophic level is the ladybug.

##### d. Name the tertiary consumer in the food chain.
- Explanation: The tertiary consumer is the organism that eats the secondary consumers. In this food chain, the secondary consumer is the ladybug, and the organism that eats the ladybug is the thrush.
- Answer: The tertiary consumer is the thrush.

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#### Part 2: Food Web Analysis

The given food web includes the following organisms:
- Producer: Grass
- Consumers: Slug, Rabbit, Thrush, Fox, Cat

##### a. Use the food chains to help you fill in the arrows on this food web. One has been added for you.
- Explanation: The food web already has some arrows filled in. We need to add arrows based on the given food chains:
1. Grass → Slug → Thrush → Cat
2. Grass → Slug → Fox
3. Grass → Rabbit → Fox
4. Grass → Rabbit → Cat

- Completed Food Web:
- Grass → Slug
- Slug → Thrush
- Thrush → Cat
- Slug → Fox
- Grass → Rabbit
- Rabbit → Fox
- Rabbit → Cat

##### b. Name the producer in this food web.
- Answer: The producer in the food web is grass.

##### c. Name a consumer in this food web.
- Answer: Any of the following can be named as a consumer: slug, rabbit, thrush, cat, fox.

##### d. What eats rabbits?
- Explanation: From the food chains and the food web, we see that rabbits are eaten by both the fox and the cat.
- Answer: Fox and Cat

##### e. What does a fox eat?
- Explanation: From the food chains and the food web, we see that the fox eats both slugs and rabbits.
- Answer: Rabbits and Slugs

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Final Answers:

1. Food Chain Analysis:
- a. Flow of energy from food to eater
- b. Lettuce
- c. Ladybug
- d. Thrush

2. Food Web Analysis:
- a. Arrows filled in as described above.
- b. Grass
- c. Slug, Rabbit, Thrush, Cat, Fox
- d. Fox and Cat
- e. Rabbits and Slugs

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Final Boxed Answers:

1. a. Flow of energy from food to eater
b. Lettuce
c. Ladybug
d. Thrush

2. a. Arrows filled in as described.
b. Grass
c. Slug, Rabbit, Thrush, Cat, Fox
d. Fox and Cat
e. Rabbits and Slugs

Final Answer: \boxed{1. a. Flow of energy from food to eater, b. Lettuce, c. Ladybug, d. Thrush; 2. a. Arrows filled in, b. Grass, c. Slug, Rabbit, Thrush, Cat, Fox, d. Fox and Cat, e. Rabbits and Slugs}