Pyramids and energy multiple choice
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Why do food chains rarely have more than four trophic levels?
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too much energy is lost at each level
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there are not enough producers
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the next predator would be too big
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some predators eat more than one type of prey
The diagram shows part of the energy flow through an ecosystem.
How would you calculate the percentage efficiency of energy transfer from the second to the third trophic levels?
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7000 divided by 97000 times 100%
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600 divided by 7000 times 100%
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7000 divided by 600 times 100%
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600 divided by 97000 times 100%
What is a suitable unit for pyramids of energy?
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kg/m
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kJ/m
2
/year
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kilojoules
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kJ/m
What do we call the amount of energy fixed by photosynthesis?
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gross primary productivity
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net primary productivity
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biomass
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photosynthetic productivity
Which of the following is NOT a means by which energy is lost when sunlight falls on plants?
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It hits non-photosynthesising parts of the plant
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it is the wrong wavelength
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it is lost as heat
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it is lost as waste products
Which of the following is correct?
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R = NPP + GPP
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NPP = GPP - energy lost by plant respiration
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GPP = NPP + energy from photosynthesis
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NPP = GPP + energy lost by plant respiration
Which of the following is correct?
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N = F - (I + R)
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N = I + (F - R)
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NPP = I - (F + R)
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N = I - (F + R)
The following diagram shows a pyramid of numbers. What type of food chain could be shown here?
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one involving parasites
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one involving a small standing crop biomass e.g. phytoplankton
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one with a lot of interspecific competition
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one involving a large producer e.g. a tree
The following diagram shows a pyramid of biomass. What type of food chain could be shown here?
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one involving parasites
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one involving a small standing crop biomass e.g. phytoplankton
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one with a lot of interspecific competition
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one involving a large producer e.g. a tree
Which of these is NOT a reason why intensive rearing of livestock increases energy conversion?
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movement is restricted
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environment can be kept cool
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feeding can be controlled
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predators are excluded
OK