Key Definitions - Use of biological resources

Question 1

define biological control of pests.

Answer 1

use of other species to kill pests, e.g. hawks to control the rat population

Question 2

define interspecific predation.

Answer 2

where an organism of one species kills an organism of a different species, e.g. in fish farming one species of fish killing another species of fish for food in the same tank. This can be reduced by separating fish of different species into separate tanks

Question 3

define intraspecific predation.

Answer 3

where an organism of one species kills an organism of the same species. In fish farming this can be reduced by separating fish by age and size in different tanks

Question 4

define lactobacillus.

Answer 4

a bacterial species used to make yoghurt

Question 5

define pesticides.

Answer 5

chemicals used to kill pests. Can be split into herbicides which are used to kill weeds and insecticides which are used to kill insects

Question 6

define yeast.

Answer 6

unicellular fungi used to produce bread. They anaerobically respire to produce carbon dioxide which makes the bread rise and the ethanol which is also produced evaporates when the bread is heated

Question 7

define selective breeding.

Answer 7

process where organisms with desirable characteristics are selected to breed and produce offspring with the desirable characteristics. Can be used for both plants and animals