Questions 1 - 10:
Complete the notes below. Write ONE WORD ONLY for each answer.
The Eucalyptus Tree in Australia
Importance
- it provides 1 and food for a wide range of species
- its leaves provide 2 which is used to make a disinfectant
Reasons for present decline in number
A) Diseases
(i) ‘Mundulla Yellows’
- Cause – lime used for making 3 was absorbed
– trees were unable to take in necessary iron through their roots
(ii) ‘Bell-miner Associated Die-back’
- Cause – 4 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 5
- mid-frequency bushfires result in the growth of eucalyptus forests, because they:
– make more 6 available to the trees
– maintain the quality of the 7
- low-frequency bushfires result in the growth of 8 rainforest’, which is:
– a 9 Ecosystem
– an ideal environment for the 10 of the bell-miner