Food Chains and Food Webs
Biology ⇒ Ecology and Environment
Food Chains and Food Webs starts at 6 and continues till grade 12.
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See sample questions for grade 11
Describe the effect of removing all producers from an ecosystem.
Describe the impact of bioaccumulation in food chains.
Describe the role of omnivores in a food web.
Explain the difference between a detritivore and a decomposer.
Explain the difference between a food chain and a food web.
Explain what would happen to a food web if all the top predators were removed.
Explain why energy pyramids are always upright in shape.
Explain why food chains rarely have more than four or five trophic levels.
If 10,000 kJ of energy is available at the producer level, approximately how much energy would be available to the secondary consumer, assuming 10% energy transfer at each level?
In a forest ecosystem, if the population of deer increases significantly, what is the likely effect on the plant population?
In a grassland food chain: Grass → Grasshopper → Frog → Snake → Hawk. If the population of grasshoppers decreases drastically, what is the most likely immediate effect on the frog population?
What is the main source of energy for most food chains on Earth?
Which trophic level would a frog occupy if it eats insects that feed on plants?
A lake ecosystem contains the following organisms: algae, small fish, large fish, zooplankton, and birds. If a pollutant causes a significant decline in the zooplankton population, predict and explain the likely effects on the populations of algae and small fish.
Calculate the amount of energy available to the tertiary consumer if the initial energy at the producer level is 20,000 kJ and only 10% of energy is transferred to each successive trophic level.
Describe how biomagnification can impact top-level consumers in a food web, using mercury in aquatic ecosystems as an example.
Explain how the stability of an ecosystem can be affected by the loss of a keystone species within a food web.
Explain why the introduction of an invasive species can disrupt existing food webs in an ecosystem.
In a certain ecosystem, the removal of a top predator led to an increase in herbivore populations and a subsequent decline in plant biomass. What ecological phenomenon does this scenario illustrate?
