Educational worksheet on food webs and food chains, featuring diagrams and questions to teach ecological relationships.

Explanation:
Let’s solve each part step by step.

Part 1: Look at this food chain
The food chain shown is:
wheat → grasshopper → ladybird → thrush → cat

a) What does the arrow mean in a food chain?
→ The arrow means “is eaten by” or “energy flows to”. So wheat → grasshopper means grasshoppers eat wheat (or get energy from wheat).

b) Name the producer in the food chain.
→ Producers are organisms that make their own food (usually plants). Here, wheat is the producer.

c) Name the third trophic level in the food chain.
Trophic levels:
1st = producer → wheat
2nd = primary consumer → grasshopper (eats producer)
3rd = secondary consumer → ladybird (eats primary consumer)
So the third trophic level is the ladybird.

d) Name the tertiary consumer in the food chain.
Tertiary consumer = eats secondary consumer.
Secondary consumer = ladybird
Thrush eats ladybird → so thrush is the tertiary consumer.
(Cat is quaternary — eats thrush — but question asks for tertiary.)

✔ Check:
- Producer: wheat
- Primary consumer: grasshopper
- Secondary consumer (3rd level): ladybird
- Tertiary consumer: thrush

Part 2: Look at these food chains
Three food chains are given (with blanks filled in boxes):

1. grass → slug → thrush → cat
2. grass → slug → fox
3. grass → rabbit → fox

a) Use the food chains to help you fill in the arrows on the diagram with “eaten by”.
(We don’t need to draw — just understand the relationships.)

b) Name the producer in the food web.
→ All chains start with grass, so grass is the producer.

c) Name a consumer in the food web.
→ Any animal that eats another organism. Examples: slug, rabbit, fox, thrush, cat. Pick one: slug (simplest).

d) What was eaten by the thrush?
→ From chain 1: thrush eats slug. So slug.

e) What does the cat eat?
→ From chain 1: cat eats thrush. So thrush.

Now let’s write all answers clearly:

1a) Arrow means “is eaten by” (or energy flows from one to the next)
1b) wheat
1c) ladybird
1d) thrush

2b) grass
2c) slug (or rabbit, fox, thrush, cat — any consumer)
2d) slug
2e) thrush

Since the worksheet likely expects short, direct answers in the blanks, and the student is to fill them in, we’ll give the exact expected words.

Final Answer:
1a) is eaten by
1b) wheat
1c) ladybird
1d) thrush
2b) grass
2c) slug
2d) slug
2e) thrush