11.3

Question 1

3 things that break up large ecosystems into small, isolated fragments are:

Answer 1

farming
road building
industrial and housing developments

Question 2

Breaking up of large ecosystems can cause the numbers of species present in the remaining fragments to…

Answer 2

decrease

Question 3

numbers of species presents in the remaining fragments decrease due to:

Answer 3

long distances between some ecosystem fragments (difficult to colonise new areas)

some of the plant species may be cut off from their pollinators so they cannot reproduce

food chains supported by these plants may collapse

small population may be too small to recover from a catastrophe

may not provide the access to food, water, shelter and mates needed for the survival of the species

Question 4

the larger sites are important in enhancing the..

Answer 4

range and variety of living organisms (biodiversity) in both rural and urban environments