Question 1 - 10
Complete the notes below. Write ONE WORD ONLY for each answer.
The Eucalyptus tree in Australia
Why the tree is important
• It supplies 1. and food to many different species.
• Its leaves yield 2., which is an ingredient in disinfectant.
Why eucalyptus numbers are currently falling
A) Diseases
(i) Mundulla Yellows
Cause:
• Lime used during the construction of 3. entered the ground.
• The roots could no longer absorb the iron the trees required.
(ii) Bell-miner Associated Die-back
Cause:
• 4. consume the eucalyptus foliage.
• They produce a sugary substance.
• Bell-miner birds seek this substance and drive other species away.
B) Bushfires — William Jackson’s theory
• Very frequent fires alter the vegetation and lead to the spread of 5..
• Fires occurring at a moderate frequency encourage eucalyptus forest because they:
• leave more 6. for eucalyptus trees;
• preserve the condition of the 7..
• When fires are rare, “8. rainforest” develops. This is:
• a 9. ecosystem;
• an ideal place for bell-miners to build their 10..
. . .
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