The Eucalyptus Tree In Australia

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 ﻿ and food to many different species.
• Its leaves yield ﻿, which is an ingredient in disinfectant.
Why eucalyptus numbers are currently falling
A) Diseases
(i) Mundulla Yellows
Cause:
• Lime used during the construction of ﻿ entered the ground.
• The roots could no longer absorb the iron the trees required.
(ii) Bell-miner Associated Die-back
Cause:
• ﻿ 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 ﻿.
• Fires occurring at a moderate frequency encourage eucalyptus forest because they:
  • leave more ﻿ for eucalyptus trees;
  • preserve the condition of the ﻿.
• When fires are rare, “﻿ rainforest” develops. This is:
  • a ﻿ ecosystem;
  • an ideal place for bell-miners to build their ﻿.

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