In any exam, the type of answer you give
depends on the question you are asked. For example the question may
ask you to:
For example, a question such as, "For an
urban area that you have studied, list the factors
that make it vulnerable to flooding", requires only a list of points
as the answer.
By contrast, a question which says,
"Describe the flood problem in an urban area that
you have studied", looks for more detail and the use of local
information. It is also asking for full sentences.
If the question is, "Explain
the flood problem for an urban area that you have studied," the
answer requires explanation, examples and full sentences.
"Evaluate the problem of
flooding in Oxford." This question asks us to compare the problem
of flooding in Oxford with other areas, and to assess how important
flooding is in Oxford.