P4 Science · Chapter 6brightbit.net/worksheets
Food Chains and Food Webs
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
In a food chain, what does the arrow (→) represent?
(a) The direction in which energy flows(b) The direction in which animals move(c) The relationship between predator and prey(d) The path of water through the ecosystem
- 2.
In the food chain: Grass → Grasshopper → Frog → Snake, what is the producer?
(a) Grasshopper(b) Frog(c) Snake(d) Grass
- 3.
What would happen to the frog population if all the grasshoppers were removed from the food chain: Grass → Grasshopper → Frog → Snake?
(a) The frog population would increase(b) The frog population would decrease(c) The frog population would stay the same(d) The frog population would move to a new area
- 4.
A food web shows ___.
(a) A single feeding relationship between two organisms(b) Many interconnected food chains in an ecosystem(c) Only the producers in an ecosystem(d) The migration patterns of animals
- 5.
An organism that only eats plants is called a ___.
(a) Carnivore(b) Omnivore(c) Herbivore(d) Decomposer
- 6.
In a food chain, the organism at the top (with no predators) is called the ___.
(a) Producer(b) Primary consumer(c) Apex predator(d) Decomposer
- 7.
Why are plants called producers?
(a) Because they produce oxygen only(b) Because they produce their own food using sunlight through photosynthesis(c) Because they produce seeds for reproduction(d) Because they are produced by decomposers
- 8.
Consider the food web: Grass → Rabbit → Fox; Grass → Mouse → Fox; Mouse → Owl. If the fox population decreases greatly, what would most likely happen to the rabbit population?
(a) Decrease(b) Stay the same(c) Increase(d) Become extinct
- 9.
Write a food chain using FOUR organisms from this list: Hawk, Caterpillar, Leaf, Thrush.
- 10.
Explain why removing the top predator from a food web can cause the number of producers (plants) to decrease.
Answer key — P4 Science: Food Chains and Food Webs
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(a) The direction in which energy flows
- 2.(d) Grass
- 3.(b) The frog population would decrease
- 4.(b) Many interconnected food chains in an ecosystem
- 5.(c) Herbivore
- 6.(c) Apex predator
- 7.(b) Because they produce their own food using sunlight through photosynthesis
- 8.(c) Increase
- 9.Leaf → Caterpillar → Thrush → Hawk
- 10.without the top predator, herbivore numbers increase and they eat more plants causing plant numbers to decrease
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