KS3 Science Quiz - Food Chains and Webs 01 (Questions)

Find out about food chains and webs in this KS3 Science quiz. A food chain shows the dependency of organisms on other organisms as a source of food. It shows how energy is transferred in a habitat. A food web is just a lot of food chains linked together - it gives a more complete picture of what eats what in a natural habitat. All food chains begin with producers e.g. plants or algae. They produce their own food by the process of photosynthesis and are the source of energy for the entire food chain. Animals in a food chain are called consumers as they need to eat plants and other animals.

An animal that eats only plants is a herbivore and can be referred to as a primary consumer. Animals that eat other animals are either carnivores (only eat other animals, never eat plants) or omnivores (eat both animals and plants). A secondary consumer is an animal that eats herbivores and a tertiary consumer is an animal that eats secondary consumers. As you go up a food chain, there is less and less energy available which is why there are fewer tertiary consumers than secondary consumers.

1. Plants are:
[ ] decomposers
[ ] herbivores
[ ] primary consumers
[ ] producers
2. Secondary consumers are usually:
[ ] carnivores
[ ] decomposers
[ ] herbivores
[ ] producers
3. Omnivores eat:
[ ] animals and plants
[ ] only animals
[ ] only decomposers
[ ] only plants
4. Which of the following do you think is the odd one out in terms of their diet?
[ ] Sheep
[ ] Lion
[ ] Rabbit
[ ] Elephant
5. Which of the following shows a correct food chain?
[ ] Barn Owl → Dormouse → Barley
[ ] Dormouse → Barley → Barn Owl
[ ] Fox → Rabbit → Grass
[ ] Grass → Rabbit → Fox
6. In the following food chain 'lettuce → rabbit → hawk', the rabbit is:
[ ] the primary consumer
[ ] the producer
[ ] the secondary consumer
[ ] the top carnivore
7. In the following food chain 'grass → grasshopper → rat → snake → hawk', the rat is:
[ ] a herbivore
[ ] the primary consumer
[ ] the secondary consumer
[ ] the top carnivore
8. In the food chain 'grass → grasshopper → rat → snake → hawk', the hawk is .......
[ ] the primary consumer
[ ] the secondary consumer
[ ] the tertiary consumer
[ ] the top carnivore
9. Rabbits and slugs eat lettuce. Hedgehogs eat slugs. Foxes eat rabbits. The rabbits get poisoned and many die. Which of the following is most likely to happen first?
[ ] Foxes and hedgehogs will decrease in number
[ ] Foxes and hedgehogs will increase in number
[ ] Slugs and foxes will increase in number
[ ] Slugs will increase in number
10. Which of the following statements is NOT correct?
[ ] Food chains always start with an organism that can produce its own food by photosynthesis
[ ] In a food web, arrows can point in any direction
[ ] Primary consumers are herbivores
[ ] Secondary consumers can be carnivores or omnivores
KS3 Science Quiz - Food Chains and Webs 01 (Answers)
1. Plants are:
[ ] decomposers
[ ] herbivores
[ ] primary consumers
[x] producers
Plants produce their own food by photosynthesis
2. Secondary consumers are usually:
[x] carnivores
[ ] decomposers
[ ] herbivores
[ ] producers
They can also be omnivores
3. Omnivores eat:
[x] animals and plants
[ ] only animals
[ ] only decomposers
[ ] only plants
Herbivores eat plants. Carnivores eat animals (meat)
4. Which of the following do you think is the odd one out in terms of their diet?
[ ] Sheep
[x] Lion
[ ] Rabbit
[ ] Elephant
The others are herbivores, in other words they are all primary consumers. A lion is a carnivore and is a secondary consumer (or higher, depending on what it has just eaten)
5. Which of the following shows a correct food chain?
[ ] Barn Owl → Dormouse → Barley
[ ] Dormouse → Barley → Barn Owl
[ ] Fox → Rabbit → Grass
[x] Grass → Rabbit → Fox
A food chain always starts with an organism that can photosynthesise
6. In the following food chain 'lettuce → rabbit → hawk', the rabbit is:
[x] the primary consumer
[ ] the producer
[ ] the secondary consumer
[ ] the top carnivore
A food chain ends at the top carnivore
7. In the following food chain 'grass → grasshopper → rat → snake → hawk', the rat is:
[ ] a herbivore
[ ] the primary consumer
[x] the secondary consumer
[ ] the top carnivore
It eats grasshoppers which are the primary consumers of this food chain
8. In the food chain 'grass → grasshopper → rat → snake → hawk', the hawk is .......
[ ] the primary consumer
[ ] the secondary consumer
[ ] the tertiary consumer
[x] the top carnivore
Nothing eats the hawk - hunting and catching it would take more energy than the predator would get from eating the hawk
9. Rabbits and slugs eat lettuce. Hedgehogs eat slugs. Foxes eat rabbits. The rabbits get poisoned and many die. Which of the following is most likely to happen first?
[ ] Foxes and hedgehogs will decrease in number
[ ] Foxes and hedgehogs will increase in number
[ ] Slugs and foxes will increase in number
[x] Slugs will increase in number
The slugs do not have as much competition when the rabbits have died so there is more slug food. More food means that a larger population of slugs can be supported in the food chain
10. Which of the following statements is NOT correct?
[ ] Food chains always start with an organism that can produce its own food by photosynthesis
[x] In a food web, arrows can point in any direction
[ ] Primary consumers are herbivores
[ ] Secondary consumers can be carnivores or omnivores
The arrows always show which way the energy is passing. In other words, they will always point towards the animal that is doing the eating and away from whatever is being eaten