ielts_academic_reading_practice_test_25_610c23cd6a

IELTS reading passage - Population Viability Analysis

Population Viability Analysis

associated with population decline may contribute to the possibility of extinction.

A recent study shows that other aspects need to be considered. Australia's

environment is highly volatile from year to year. The changes add another degree

of uncertainty to the survival of many organisms. Disasters such as fire, flood,

drought, or epidemics can reduce the population to a small part of their average

level. When the two additional uncertainties are paid for, the population needed to

sustain a few hundred years can increa by thousands.

Part C

Apart from the process, we need to keep in mind the population distribution. A

3. Early tries to assume population viability was bad on population uncertainty

4. Destruction of the species in a particular area is a natural thing.

5. All pairs can produce multiple babies in the same year.

Questions (6 - 10)

Complete the ntences below.

WriteNO MORE THAN TWO WORDS/NUMBERSfrom the passagefor each answer.

6.

Extinction is not possible if the number of peoplein a population is over

___________ and the ___________ is expanding.

A. a century

B. 10 years

C. 20 years