Food Webs and Food Chains Worksheets - Free Pintables - Free Printable

Let’s go step by step to answer each question clearly and simply.

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Q1. What is a food web?

A food web is like a big map that shows how different animals and plants are connected through what they eat. It’s made up of many food chains linked together. For example, grass is eaten by rabbits and mice, but those animals might also be eaten by foxes or hawks — so all these connections form a “web” instead of just one straight line.

✔ Final Answer: A food web is a network of interconnected food chains showing how energy and nutrients flow between different organisms in an ecosystem.

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Q2. What would happen if the snake population decreases?

If there are fewer snakes, then the animals that snakes eat (like frogs and birds) will have fewer predators. So their populations might grow bigger. But at the same time, animals that eat snakes (like hawks) will have less food, so their numbers might go down. This can cause a ripple effect through the whole food web.

✔ Final Answer: If the snake population decreases, frog and bird populations may increase, while hawk populations may decrease due to less food.

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Q3. When do we consider the ecosystem to be in equilibrium?

An ecosystem is in equilibrium when all the populations of living things stay fairly stable over time — not growing too fast or dying out. That means producers (like grass), consumers (like rabbits and foxes), and decomposers are balanced. Energy flows smoothly, and no single group takes over or disappears.

✔ Final Answer: An ecosystem is in equilibrium when all organism populations remain stable and balanced over time, with no major changes in numbers or roles.

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Q4. What happens to energy as we move up from one step to another in a chain or web?

Energy gets lost at each step! Only about 10% of the energy from one level passes to the next. The rest is used for life processes (like moving, breathing, staying warm) or lost as heat. That’s why there are usually more plants than herbivores, and more herbivores than carnivores — because there’s less energy available higher up.

✔ Final Answer: As you move up each step in a food chain or web, only about 10% of the energy is passed on — the rest is used or lost as heat.

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Now let’s look at the second part — the simple food chain:

Sun → Grass → Grasshopper → Frog → Snake → Hawk

Q1. What is a food chain?

A food chain is a simple, straight-line path that shows who eats whom. It starts with a producer (like grass) that makes its own food using sunlight, then goes to an animal that eats it, then to another animal that eats that one, and so on.

✔ Final Answer: A food chain is a linear sequence showing how energy moves from one organism to another through eating — starting with a producer and ending with a top predator.

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Q2. Name the producer in the food chain.

The producer is the organism that makes its own food — usually a plant. In this chain, grass uses sunlight to make food, so it’s the producer.

✔ Final Answer: Grass

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Final Answer:
- Q1 (Food Web): A food web is a network of interconnected food chains showing how energy and nutrients flow between different organisms in an ecosystem.
- Q2 (Snake Decrease): If the snake population decreases, frog and bird populations may increase, while hawk populations may decrease due to less food.
- Q3 (Equilibrium): An ecosystem is in equilibrium when all organism populations remain stable and balanced over time, with no major changes in numbers or roles.
- Q4 (Energy Flow): As you move up each step in a food chain or web, only about 10% of the energy is passed on — the rest is used or lost as heat.
- Q1 (Food Chain): A food chain is a linear sequence showing how energy moves from one organism to another through eating — starting with a producer and ending with a top predator.
- Q2 (Producer): Grass