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Science > ch 20 > Flashcards

ch 20 Flashcards

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Biology 101 flashcards
1
Q

ecosystem

A

all living/nonliving in an area

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2
Q

abiotic v biotic

A

biotic: living
abiotic: nonliving

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3
Q

4 examples of abiotic structures

A

sunlight climate water soil

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4
Q

weather v climate

A

weather-current conditions
climate-average weather conditions

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5
Q

most abundant molecule in all living things

A

water

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6
Q

2 most abundant gases in the atmosphere + their percentages

A

nitrogen-78%
oxygen-21%

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7
Q

which size of rock particle is smallest?

A

clay

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8
Q

why is it hard for plants ti grow in clay?

A

no room for roots of water

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9
Q

what is humus, what is it made of?

A

decayed remains of once living organisms

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10
Q

what is the largest source of water?

A

ocean

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11
Q

largest source of fresh water?

A

glaciers

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12
Q

liquid to gas

A

evaporation

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13
Q

gas to liquid

A

condensation

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14
Q

water droplets fall from the atmosphere

A

precipitation

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15
Q

what powers the water cycle

A

the sun

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16
Q

name two types of molecules that cannot be formed without nitrogen

A

dna and protein

17
Q

nitrogen fixation

A

bacteria on plant roots capture nitrogen and make into a form plants and animals can use

18
Q

how do fossil fuels form?

A

through intense pressure on plants buried deep underground

19
Q

3 examples of fossil fuels

A

oil gas coal

20
Q

name the two main ways carbon dioxide is released into the atmosphere

A

living things breathe it out
combustion

21
Q

why is carbon called a greenhouse gas?

A

keeps earth warm

22
Q

what has happened to the CO2 levels in the atmosphere

A

increasing

23
Q

what are producers?

A

living things that can make their own food, usually through photosynthesis

24
Q

consumers

A

living things that must eat to survive

25
Q

carnivore

A

meat

26
Q

omnivore

A

meat and plants

27
Q

herbivore

A

plants

28
Q

where in the energy pyramid would you find producers

A

bottom layer

29
Q

if the lowest level on the pyramid contains 8500 J how much of that energy is available in the 3rd trophic level?

A

85 J

30
Q

of only 105 OF THE ENERGY is transferred to an organism in the next trophic level, what happens to the other 90%

A

becomes heat

31
Q

what is that type of diagram called?

A

food web

32
Q

do arrows point to predator or prey

A

predators

Science (10 decks)

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