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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A grassland food chain is as follows: Grass → Grasshopper → Frog → Snake → Hawk. If the population of frogs decreases significantly, what is the most likely effect on the grasshopper population?
Describe how the removal of a keystone species can affect a food web.
Describe the difference between a detritivore and a decomposer.
Describe the impact of invasive species on native food webs.
Describe the role of decomposers in a food web.
A food chain has 5 trophic levels. If the producers have 10,000 kJ of energy, how much energy would be available to the tertiary consumer, assuming 10% energy transfer at each level?
A grassland food chain is as follows: Grass → Grasshopper → Frog → Snake → Hawk. If the population of frogs decreases significantly, what is the most likely effect on the grasshopper population?
In a forest ecosystem, if the population of herbivores decreases, what is the likely effect on the population of producers?
Which of the following best describes a food chain?
(1) A network of interconnected food relationships in an ecosystem
(2) A linear sequence showing who eats whom in an ecosystem
(3) The total number of organisms in an ecosystem
(4) The process of photosynthesis in plants
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 biomass is lost at each level
Which of the following best explains why food chains are usually limited to 4 or 5 trophic levels?
(1) There are not enough species
(2) Energy is lost at each trophic level
(3) Producers cannot support more consumers
(4) Decomposers outcompete consumers
Which of the following best represents the correct order of a simple food chain?
(1) Producer → Primary consumer → Secondary consumer → Tertiary consumer
(2) Primary consumer → Producer → Secondary consumer → Tertiary consumer
(3) Producer → Secondary consumer → Primary consumer → Tertiary consumer
(4) Tertiary consumer → Secondary consumer → Primary consumer → Producer
Fill in the blank: In a food web, an organism that eats both plants and animals is called an __________.
Fill in the blank: In aquatic food chains, the primary producers are usually __________.
Fill in the blank: Organisms that feed on both plants and animals are called __________.
Fill in the blank: Organisms that obtain energy by breaking down dead organic matter are called __________.
True or False: All consumers in a food web are carnivores.
True or False: All food chains must start with a green plant or photosynthetic organism.
True or False: Carnivores can be found at multiple trophic levels in a food web.
True or False: Decomposers are not part of food webs.
