Practise MYP Biology questions on 6.3 Food Chains and Webs and review the explanations to check your understanding.
Use these questions for topic practice and to find ideas you want to revisit in your notes or lessons.
What is the functional difference between a detritivore and a decomposer?
Which of the following organisms is correctly matched with its specific trophic level in a standard food chain?
Why is a pyramid of biomass in a terrestrial ecosystem usually wide at the bottom and narrow at the top?
What is the primary ecological reason why food chains rarely exceed five trophic levels?
True or False: A keystone species is defined by being the most abundant species within its ecosystem.
Detritivores are producers, while decomposers are consumers
Decomposers only live in water, while detritivores only live on land
There is no functional difference; the terms are synonymous
Detritivores ingest dead matter, while decomposers secrete enzymes for external digestion
Grasshopper — Secondary consumer
Oak tree — Producer
Hawk — Primary producer
Toad — Primary consumer
Because there are more carnivores than herbivores in most forests
Because producers have the highest total dry mass to support higher levels
Because top predators have the largest body size
Because heat energy is converted into physical mass at higher levels
Producers cannot photosynthesize fast enough
Decomposers only work on the first three levels
Apex predators are too large to be eaten
There is not enough energy remaining to support another level
True
False
