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 11
Define the term 'trophic level'.
Describe how energy flow in an ecosystem is different from the flow of matter.
Describe the difference between gross primary productivity (GPP) and net primary productivity (NPP).
Describe the role of sunlight in the energy flow of an ecosystem.
If a tertiary consumer receives 10 kJ of energy, how much energy was present at the producer level, assuming 10% energy transfer at each level?
In a forest ecosystem, if the net primary productivity is 2,000 kJ/m²/year and plant respiration is 500 kJ/m²/year, what is the gross primary productivity?
In a grassland ecosystem, if the producers have 10,000 kJ of energy, how much energy would you expect to be available to the primary consumers?
Which of the following best describes the energy available to the third trophic level in a food chain if the producers have 5,000 kJ of energy?
(1) 5,000 kJ
(2) 500 kJ
(3) 50 kJ
(4) 5 kJ
In a marine ecosystem, phytoplankton are considered to be at which trophic level?
(1) Primary consumers
(2) Secondary consumers
(3) Producers
(4) Decomposers
Which law of thermodynamics explains why energy is lost as heat in an ecosystem?
(1) First law
(2) Second law
(3) Third law
(4) Zeroth law
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 energy available to the third trophic level in a food chain if the producers have 5,000 kJ of energy?
(1) 5,000 kJ
(2) 500 kJ
(3) 50 kJ
(4) 5 kJ
Fill in the blank: Organisms that obtain energy by eating both plants and animals are called __________.
Fill in the blank: The efficiency of energy transfer from one trophic level to the next is called __________ efficiency.
Fill in the blank: The energy available to the herbivores from the producers is called __________.
Fill in the blank: The loss of energy at each trophic level limits the __________ of the food chain.
True or False: All the energy captured by producers is available to herbivores.
True or False: Decomposers play a role in energy flow by breaking down dead organisms and releasing energy back into the ecosystem.
True or False: Energy flow in an ecosystem is a cyclic process.
True or False: Energy flow in an ecosystem is governed by the laws of thermodynamics.
