Topic 10: key words

Question 1

Ecosystem

Answer 1

the interaction of biotic and abiotic factors

Question 2

Biosphere

Answer 2

the total area of the Earth and atmosphere that is inhabited by living organisms

Question 3

Habitat

Answer 3

a division of the biosphere with its own unique characteristics and conditions

Question 4

Population

Answer 4

a group of members of the same species that interact with each other

Question 5

Community

Answer 5

a group of populations of different species interacting in the same habitat

Question 6

Food chain

Answer 6

shows the feeding relationships of organisms in an ecosystem

Question 7

Food web

Answer 7

shows how interconnected and complex the feeding levels are in an ecosystem

Question 8

Trophic levels

Answer 8

the number of energy transfers an organism is from the primary energy source

Question 9

Biomass

Answer 9

the dry mass of living material in each organism x the total number of organisms in that trophic level

Question 10

Gross primary productivity

Answer 10

the total amount of energy fixed through photosynthesis in a given period of time

Question 11

net primary productivity

Answer 11

the total amount of energy fixed through photosynthesis in a given period of time which remains available for the next trophic levels

Question 12

nitrifying bacteria

Answer 12

convert decomposers into nitrates

Question 13

nitrogen fixing bacteria

Answer 13

convert inert N2 gas into ammonia