Unit 6 - Ecosystems

Question 1

availability of food and the ability to obtain it

Answer 1

food security

Question 2

amount of useful product

Answer 2

yield

Question 3

chemical applied to crops to destroy pests that damage crops

Answer 3

pesticide

Question 4

when a single crop is grown in a large field

Answer 4

monoculture

Question 5

role of an organism in its ecosystem

Answer 5

niche

Question 6

when both organisms in a dependent relationship benefit

Answer 6

symbiosis

Question 7

type of symbiosis where one organism benefits and the other does not

Answer 7

commensalism

Question 8

type of symbiosis where both organisms benefit

Answer 8

mutualism

Question 9

type of symbiosis where one organism benefits but the other is harmed

Answer 9

parasitism

Question 10

struggle between different organisms for survival

Answer 10

competition

Question 11

when there are so few of a species left that it could disappear altogether

Answer 11

endangered

Question 12

the range of different organisms within an ecosystem

Answer 12

biodiversity

Question 13

when a species of an organism has died out

Answer 13

extinct

Question 14

when the number of a species drops very low

Answer 14

vulnerable

Question 15

when animals are bred in zoos and wildlife reserves to try to conserve species

Answer 15

captive breeding

Question 16

a chemical put on soil to increase soil fertility and allow better growth of crop plants

Answer 16

fertiliser

Question 17

chemical applied to crops to destroy insects that damage crops

Answer 17

insecticide

Question 18

a substance that damages a living organism

Answer 18

toxin

Question 19

increase in the concentration of a chemical as it is passed from one organism to another up a food chain

Answer 19

bioaccumulation

Question 20

organisms with a narrow niche

Answer 20

specialist

Question 21

organism with a broad niche

Answer 21

generalist

Question 22

when species with similar needs use resources in slightly different ways

Answer 22

resource partitioning

Question 23

different species of the same organism living successfully in the same community

Answer 23

co-exist

Question 24

the range of characteristics across individuals of the same group

Answer 24

variation