Energy Flow in Ecosystems
Biology ⇒ Ecology and Environment
Energy Flow in Ecosystems starts at 7 and continues till grade 12.
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See sample questions for grade 10
Describe the difference between a food chain and a food web.
Describe the difference between gross primary productivity and net primary productivity.
Describe what is meant by a trophic level.
Explain the role of producers in the energy flow of an ecosystem.
Explain the significance of the 10% law in energy transfer.
A food chain in a pond is: Algae → Small Fish → Large Fish → Bird. If the algae have 2,000 kJ of energy, how much energy would the bird receive?
A grassland ecosystem has 5,000 kJ of energy at the producer level. Estimate the energy available at the tertiary consumer level.
In a food web, what would likely happen if all the primary consumers were removed?
Which of the following best describes a food web?
(1) A linear sequence of organisms
(2) A network of interconnected food chains
(3) A group of producers only
(4) A group of decomposers only
Which of the following best describes the direction of energy flow in an ecosystem?
(1) From decomposers to producers to consumers
(2) From consumers to producers to decomposers
(3) From producers to consumers to decomposers
(4) From consumers to decomposers to producers
Which of the following best describes the role of sunlight in an ecosystem?
(1) It is stored by decomposers
(2) It is the initial source of energy for most ecosystems
(3) It is produced by consumers
(4) It is recycled by producers
Which of the following best explains why there are fewer top predators than producers in an ecosystem?
(1) Top predators reproduce more slowly
(2) Energy is lost at each trophic level
(3) Producers are less important
(4) Top predators are smaller in size
Fill in the blank: Organisms that obtain energy by eating both plants and animals are called ________.
Fill in the blank: The energy available to the next trophic level is always ________ than the previous level.
Fill in the blank: The first trophic level in any ecosystem is always occupied by ________.
Fill in the blank: The loss of energy between trophic levels is mainly due to ________.
True or False: All energy entering an ecosystem is eventually lost as heat.
True or False: Carnivores can be both secondary and tertiary consumers.
True or False: Decomposers play a role in returning nutrients to the ecosystem.
True or False: Energy can be created and destroyed in an ecosystem.
