Food Chains and Food Webs Quiz

Grade 4 · Science · Quiz

Test your knowledge of food chains, food webs, and energy flow in ecosystems.

Questions

In the food chain Grass → Rabbit → Fox, what is the rabbit?
1. Producer
2. Primary consumer
3. Secondary consumer
4. Decomposer
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Answer: Primary consumer
The rabbit eats grass (the producer), making it the primary (first-level) consumer.
In the food chain Grass → Rabbit → Fox, what is the fox?
1. Producer
2. Primary consumer
3. Secondary consumer
4. Decomposer
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Answer: Secondary consumer
The fox eats the rabbit (primary consumer), making the fox a secondary consumer.
About how much energy passes from one trophic level to the next?
1. 100%
2. 50%
3. 25%
4. 10%
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Answer: 10%
The 10% rule states that only about 10% of energy from one trophic level is passed on to the next.
Which best describes a food web?
1. A single path of energy
2. Many overlapping food chains
3. Only producers and consumers
4. A chart of animal speeds
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Answer: Many overlapping food chains
A food web connects many food chains to show the complex feeding relationships in an ecosystem.
Producers are found at the first level of every food chain.
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Answer: True
Producers like plants always form the base (first level) of food chains because they convert sunlight to food.
There are usually more carnivores than herbivores in an ecosystem.
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Answer: False
Because energy is lost at each level, there are always far more herbivores than carnivores in a healthy ecosystem.
If a key species disappears from a food web, other species can be affected.
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Answer: True
When a key species is removed, the populations of its prey increase and its predators decrease — called a cascade effect.
The sun provides the original ___ that powers all food chains.
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Answer: energy
The sun is the original energy source. Plants capture solar energy through photosynthesis, starting the food chain.
A hawk that eats a snake is called a ___.
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Answer: predator
A predator is an animal that hunts and eats other animals. The hawk hunting the snake is the predator.
Why are there always more plants than top predators in an ecosystem?
1. Plants grow faster
2. Predators migrate
3. Energy is lost at each trophic level
4. Plants need less water
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Answer: Energy is lost at each trophic level
Because 90% of energy is lost at each level, it takes enormous amounts of plants to support just a few top predators.

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