Energy Flow, Food Chains & Food Webs — Drills · Grade 7 Science
Chapter: Ecosystems, Matter & EnergyWhat these drills covers
By the end of Energy Flow, Food Chains & Food Webs you should be able to:
- I can explain energy flow, food chains & food webs.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice and written answer, each with a worked explanation.
Vocabulary used: ecosystem, producer, consumer, food web, decomposer.
Problem 1
In the stated convention, grass→rabbit means what?
- Grass hunts rabbits
- Rabbit receives food matter and energy from grass
- Rabbits create sunlight
- Grass becomes a whole rabbit instantly
Answer and explanation
Rabbit receives food matter and energy from grass
The arrow tracks transfer from the eaten resource toward the consumer.
Problem 2
Name information missing from a web that prevents an exact population prediction.
Answer and explanation
Feeding rates, dependence on each resource, initial counts, movement, and environmental conditions are examples of needed information.
Problem 3
Why is a decomposer not outside the food system?
Answer and explanation
It obtains and transfers organic matter and energy from dead material and wastes within connected pathways.
Problem 4
Why might a consumer persist after one food source declines?
Answer and explanation
It may use other resources, migrate, or respond over time; the web shows possible connections rather than an immediate fixed outcome.