PART 4

Questions 31 – 40

Complete the notes below.

Write ONE WORD ONLY for each answer.

The Eucalyptus Tree in Australia

Importance

●   it provides 31……………. and food for a wide range of species

●   its leaves provide 32…………….. which is used to make a disinfectant

Reasons for present decline in number

A) Diseases

(i)   ‘Mundulla Yellows’

●   Cause   – lime used for making 33……………… was absorbed

                   – trees were unable to take in necessary iron through their roots

(ii)   ‘Bell-miner Associated Die-back’

●   Cause   – 34………….. feed on eucalyptus leaves

                    – they secrete a substance containing sugar

                    – bell-miner birds are attracted by this and keep away other species

B) Bushfires

William Jackson’s theory:

●   high-frequency bushfires have impact on vegetation, resulting in the growth of 35…………….

●   mid-frequency bushfires result in the growth of eucalyptus forests, because they:

      – make more 36……………. available to the trees

      – maintain the quality of the 37……………….

●   low-frequency bushfires result in the growth of 38 ‘……………….. rainforest’, which is:

      – a 39………………. Ecosystem

      – an ideal environment for the 40……………… of the bell-miner