Ecosystems Flashcards

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1
Q

what is interdependence

A

organisms that depend on each other for survival

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2
Q

what is abiotic

A

non living factors e.g light intensity

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3
Q

biotic factors

A

impact of other organisms on an ecosystem

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4
Q

what are producers

A

produce biomass

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5
Q

what are primary consumers

A

eat producers

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6
Q

what is the food chain called

A

trophic level

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7
Q

what happens during the carbon cycle

A

plants take in carbon dioxide from atmosphere and use it for photosynthesis
carbon is either passed out by respiration or passed to animals who eat the plants
animals respire and release carbon dioxide
when organisms die microorganisms decay them until carbon dioxide is released by microbial respiration
if dead organisms dont decay they turn into fossil fuels and are burned

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8
Q

what is biodiversity

A

variety of species of organsims in an ecosystems

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9
Q

what does a high biodiversity mean

A

stable ecosystem as organisms rely dependent on a greater number of organisms

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10
Q

why are peat bogs being destroyed

A

for compost

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11
Q

why is destroying peat bogs bad

A

reduces biodiversity
releases carbon diode

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12
Q

what does a prymid of biomas show

A

how much biomass is transferred between trophic levels

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13
Q

how to find %absorbed of biomass

A

(biomass at 2nd level / biomass at 1s level) x 100

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14
Q

what happens to biomass as you go down levels

A

biomass is lost because not all of its absorbed and lose it while they’re alive via excrements

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15
Q

what is sustainable fishing and give an example

A

ensures fish are not caught faster than they can breed

leaving big enough holes for young fish to escape

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16
Q

How do peat bogs help biodiversity

A

They store carbon
Improve water quality
Reduce flood risks

17
Q

What is one benefit of fallen leaves for living plants

A

nitrates are released into the soil

18
Q

why are sewages bad

A

causes algae to grow and block light of other plants
reduction in oxygen

19
Q

why are fertilisers bad

A

when it rains it causes rivers to become polluted