Which ecological pyramid is ALWAYS upright and can NEVER be inverted?
APyramid of Numbers
BPyramid of Biomass
CPyramid of Energy
DPyramid of Numbers and Biomass
Question 2
The '10% rule' in ecology (Lindemann's law) states that:
AOnly 10% of species survive environmental change
BOnly 10% of energy at one trophic level transfers to the next
C10% of population controls 90% of food resources
DFood chains must have at least 10 links
Question 3
Rhizobium bacteria fix atmospheric nitrogen in:
AFree soil (non-symbiotic)
BRoot nodules of leguminous plants (symbiotic)
CAquatic ecosystems only
DLeaves of cereal crops
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