ch 20

Question 1

ecosystem

Answer 1

all living/nonliving in an area

Question 2

abiotic v biotic

Answer 2

biotic: living
abiotic: nonliving

Question 3

4 examples of abiotic structures

Answer 3

sunlight climate water soil

Question 4

weather v climate

Answer 4

weather-current conditions
climate-average weather conditions

Question 5

most abundant molecule in all living things

Answer 5

water

Question 6

2 most abundant gases in the atmosphere + their percentages

Answer 6

nitrogen-78%
oxygen-21%

Question 7

which size of rock particle is smallest?

Answer 7

clay

Question 8

why is it hard for plants ti grow in clay?

Answer 8

no room for roots of water

Question 9

what is humus, what is it made of?

Answer 9

decayed remains of once living organisms

Question 10

what is the largest source of water?

Answer 10

ocean

Question 11

largest source of fresh water?

Answer 11

glaciers

Question 12

liquid to gas

Answer 12

evaporation

Question 13

gas to liquid

Answer 13

condensation

Question 14

water droplets fall from the atmosphere

Answer 14

precipitation

Question 15

what powers the water cycle

Answer 15

the sun

Question 16

name two types of molecules that cannot be formed without nitrogen

Answer 16

dna and protein

Question 17

nitrogen fixation

Answer 17

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

Question 18

how do fossil fuels form?

Answer 18

through intense pressure on plants buried deep underground

Question 19

3 examples of fossil fuels

Answer 19

oil gas coal

Question 20

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

Answer 20

living things breathe it out
combustion

Question 21

why is carbon called a greenhouse gas?

Answer 21

keeps earth warm

Question 22

what has happened to the CO2 levels in the atmosphere

Answer 22

increasing

Question 23

what are producers?

Answer 23

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

Question 24

consumers

Answer 24

living things that must eat to survive

Question 25

carnivore

Answer 25

meat

Question 26

omnivore

Answer 26

meat and plants

Question 27

herbivore

Answer 27

plants

Question 28

where in the energy pyramid would you find producers

Answer 28

bottom layer

Question 29

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

Answer 29

85 J

Question 30

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

Answer 30

becomes heat

Question 31

what is that type of diagram called?

Answer 31

food web

Question 32

do arrows point to predator or prey

Answer 32

predators