food production

Question 1

the increasing human population requires

Answer 1

an increased food supply

Question 2

methods of increasing food yield include

Answer 2

the use of fertilisers, pesticides, biological control and genetically modified crops (GM)

Question 3

Fertilisers can be added to soil to provide …….. such as ………………..

Answer 3

chemicals such as nitrates which increase crop yield

Question 4

nitrates dissolved in water are absorbed into

Answer 4

plants

Question 5

nitrates are used to produce …….. ……. which are synthesised into plant ………….

Answer 5

amino acids which are synthesised into plant proteins

Question 6

animals consume plants or other animals to obtain ….. …… for ……. ……..

Answer 6

amino acids for protein synthesis

Question 7

fertilisers can …… from fields into freshwater, adding extra unwanted …….. increasing the effects of …….. …….

Answer 7

leach from fields into freshwater, adding extra unwanted nitrates, increasing the effects of algal blooms

Question 8

increased algal blooms can

Answer 8

reduce light levels, killing aquatic plants

Question 9

dead plants and dead algae are used as a …….. …….. and are decomposed by ……….. ……… which multiply and reduce the …………… …………….. in the water

Answer 9

dead plants and dead algae are used as a food supply and are decomposed by aerobic bacteria which multiply and reduce the oxygen concentration in the water

Question 10

a decrease in oxygen concentration due to an increase in algal blooms results in

Answer 10

the death of many other organisms and reduces biodiversity

Question 11

GM crops can be used to

Answer 11

reduce the use of fertilisers

Question 12

pesticides are

Answer 12

chemicals that can be used to kill plants and animals that reduce crop yield

Question 13

pesticides sprayed onto crops can accumulate in the bodies of organisms over time and so……….. along food chains

Answer 13

bioaccumulate

Question 14

……… levels of pesticides in the bodies of carnivores build up and reach lethal levels

Answer 14

toxicity

Question 15

biological control relies on

Answer 15

natural solutions to pest problems such as making use of natural predators or parasites

Question 16

crop species can be ……….. …………. to increase their yields without the need for ………… and ………….

Answer 16

genetically modified to increase their yields without the need for fertilisers and pesticides

Question 17

biological control and GM crops are alternatives to the use of

Answer 17

pesticides

Question 18

using biological control and GM crops could result in

Answer 18

less damage to the environment

Question 19

bioaccumulation is

Answer 19

the build-up of toxic substances in living organisms

Question 20

an algal bloom is

Answer 20

the rapid increase of algal numbers in water