gross primary productivity - ANSWERStotal amount of organic material fixed by autotrophs
net primary productivity - ANSWERSproductivity minus the energy used in respiration
Abiotic factors that effect the rate of primary productivity - ANSWERSmoisture/water; sunlight; carbon dioxide
Descri...
AICE ENVIRO UNIT 4 Questions &
Answers
gross primary productivity - ANSWERStotal amount of organic material fixed by
autotrophs
net primary productivity - ANSWERSproductivity minus the energy used in respiration
Abiotic factors that effect the rate of primary productivity - ANSWERSmoisture/water;
sunlight; carbon dioxide
Describe what pyramid of numbers show - ANSWERSthe total number of individual
organisms at each trophic level in the food chain of an ecosystem
Explain the shape of the pyramid of numbers - ANSWERSA tree is large and able to
support many organisms that are smaller in size. The pyramid has a small layer at the
bottom reflecting this. The trophic levels that depend on the tree have greater numbers
of individuals.
Explain why there is a long period of time between the start of succesion and the growth
of large trees - ANSWERSIn the initial stages, there are bare rocks and minimal soils.
The pioneer species break down the rock, slowly allowing soils to develop. Soils need to
be deep enough and have sufficient nutrient build-up to support the larger trees. This
takes time to occur during the process of succession.
Primary succesion - ANSWERSecological succession in which plants and animals first
colonize newly formed land, such as a new volcanic island: that is, succession occurs
where no ecosystem existed previously (no soil)
secondary succession - ANSWERSSuccession following a disturbance that destroys a
community without destroying the soil
abiotic factors that control the distribution of tropical forest biome -
ANSWERSTemperature and precipitation
describe the effect of abiotic factors on rainforest soils - ANSWERSWater: leaching of
soils, loss of nutrients.
Temperature: chemical weathering, rapid nutrient turnover. Parent rock: minerals found
in soils.
Explain how the structure of the rainforest supports high levels of biodiversity -
ANSWERSdifferent layers support different organisms. Higher up there is more light;
lower down is a darker area with different vegetation. Climbing and flying species live
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