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biology 0610printed 277 · PDF 277
328 pagesrevision 46933
printed 277 · PDF 277
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36 The diagram shows two pyramids based on food chains in which the producer is a large tree.
P Q
What do the two pyramids represent?
P Q
A biomass biomass
B biomass numbers
c numbers biomass
D numbers numbers
38 Which organisms remove nitrate ions from soil?
A
B
c
D
denitrifying bacteria and nitrogen-fixing bacteria in root nodules
denitrifying bacteria and plants
nitrifying bacteria and plants
nitrogen-fixing bacteria in root nodules
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