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 8
Describe the role of producers in a food web.
Describe what is meant by 'trophic level'.
Describe what would happen if all the producers in an ecosystem died.
Explain the difference between a food chain and a food web.
Explain why energy transfer between trophic levels is not 100% efficient.
Explain why food webs are more stable than food chains.
If 10,000 units of energy are available at the producer level, and only 10% of energy is transferred to each level, how much energy is available to the secondary consumer?
If a disease kills most of the rabbits in a grassland food web, what is likely to happen to the populations of grass and foxes?
In a food web, what would likely happen if a top predator is removed?
In a forest ecosystem, if the population of deer increases greatly, what might happen to the plants and the predators of deer?
What is a food chain?
What is the main source of energy for most food chains on Earth?
What role do decomposers play in a food web?
Which organism is at the top of the following food chain: Grass → Grasshopper → Frog → Snake → Hawk?
A food chain has four trophic levels. If only 10% of energy is transferred from one level to the next, what percentage of the original energy from the producers reaches the tertiary consumer?
A grassland food web includes grass, grasshoppers, mice, snakes, and hawks. If a pesticide kills most of the grasshoppers, predict and explain the possible effects on the populations of mice and snakes.
Consider a lake ecosystem where algae are eaten by small fish, which are eaten by larger fish, which are then eaten by birds. If pollution kills most of the algae, what is the most likely consequence for the bird population?
Explain why removing decomposers from an ecosystem would eventually disrupt the entire food web.
In a desert ecosystem, a simple food chain is: Cactus → Insect → Lizard → Hawk. If a severe drought causes most cacti to die, explain how this could affect the rest of the food chain.
