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 who eats whom in nature. It connects many different food chains together. Instead of just one line (like grass → rabbit → fox), it shows how animals can eat more than one thing, and how energy moves through many paths in an ecosystem.

✔ Final Answer:
A food web is a network of interconnected food chains showing how energy and nutrients move through an ecosystem as organisms eat each other.

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Q2. What would happen if the snake population decreases?

Look at the food web: snakes eat frogs and birds. If there are fewer snakes, then frogs and birds won’t be eaten as much — so their populations might grow. But also, hawks and owls eat snakes — so if snakes disappear, those predators might have less food and could struggle or switch to eating other animals.

✔ Final Answer:
If the snake population decreases, frog and bird populations may increase because they’re not being eaten as much. Also, hawks and owls that eat snakes might have less food and may need to hunt other animals instead.

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

An ecosystem is in balance when all the living things — plants, animals, insects — exist in stable numbers. No group is growing too fast or dying out too quickly. Energy flows smoothly, and every organism has enough food and space without causing harm to others.

✔ Final Answer:
We consider the ecosystem to be in equilibrium when all populations are stable, resources are balanced, and no species is overgrowing or disappearing — meaning everything works together harmoniously.

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

Energy doesn’t stay the same as you go up. At each level — like from grass to mouse to owl — some energy is lost as heat or used for movement, breathing, etc. Only about 10% of the energy passes to the next level. That’s why there are usually fewer top predators than plants.

✔ Final Answer:
As we move up each step in a food chain or web, energy decreases — only about 10% is passed on to the next level, while the rest is lost as heat or used by the organism.

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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 straight-line path that shows how energy moves from one living thing to another. It starts with something that makes its own food (like plants) and ends with a predator that isn’t usually eaten by anything else.

✔ Final Answer:
A food chain is a linear sequence showing how energy and nutrients pass from one organism to another, starting with a producer and ending with a top consumer.

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Q2. Name the producer in the food chain.

Producers make their own food using sunlight — usually plants. In this chain, grass uses sunlight to grow. So grass is 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 move through an ecosystem as organisms eat each other.
Q2 (Snake decrease): If the snake population decreases, frog and bird populations may increase because they’re not being eaten as much. Also, hawks and owls that eat snakes might have less food and may need to hunt other animals instead.
Q3 (Equilibrium): We consider the ecosystem to be in equilibrium when all populations are stable, resources are balanced, and no species is overgrowing or disappearing — meaning everything works together harmoniously.
Q4 (Energy flow): As we move up each step in a food chain or web, energy decreases — only about 10% is passed on to the next level, while the rest is lost as heat or used by the organism.
Q1 (Food Chain): A food chain is a linear sequence showing how energy and nutrients pass from one organism to another, starting with a producer and ending with a top consumer.
Q2 (Producer): Grass