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.
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?
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.
Describe how biomagnification can impact top-level consumers in a food web, using mercury in aquatic ecosystems as an example.
In a marine food web, which organism is most likely to be a primary producer? (1) Shark (2) Phytoplankton (3) Jellyfish (4) Crab
Which of the following best describes a food chain? (1) A sequence of organisms each dependent on the next as a source of food (2) A group of organisms living in the same area (3) The process of photosynthesis (4) The movement of water through an ecosystem
Which of the following best describes an apex predator? (1) An organism that eats only plants (2) An organism at the top of the food chain with no natural predators (3) An organism that decomposes dead matter (4) An organism that is always a secondary consumer
Which of the following best describes the 10% law in food chains? (1) 10% of energy is lost at each trophic level (2) 10% of energy is transferred to the next trophic level (3) 10% of organisms survive at each level (4) 10% of producers are eaten by consumers
Decomposers play a vital role in food webs by _______.
Fill in the blank: In a food chain, energy is lost at each trophic level mainly as _______.
Fill in the blank: Organisms that feed on both plants and animals are called _______.
Fill in the blank: The interconnected network of food chains in an ecosystem is called a _______.
Is it possible for an organism to occupy more than one trophic level in a food web? Yes or No.
True or False: All food chains must start with a green plant or photosynthetic organism.
True or False: Decomposers are essential for nutrient cycling in ecosystems.
True or False: Energy transfer between trophic levels is 100% efficient.
