IGCSE English 0500: Writing a Thesis Statement and Topic Sentences

A recent editorial in your local newspaper included this extract:

"Modern zoos are no longer just entertainment. Accredited zoos fund conservation programmes, run captive breeding schemes for endangered species, and give millions of visitors, many of whom will never travel to a rainforest or savannah, a direct, memorable encounter with wildlife that inspires them to care about it."

You are writing an extended discursive coursework assignment in response, arguing that zoos should be phased out in favour of funding wildlife conservation directly in its natural habitat.

(a) Write a single-sentence thesis statement for your assignment that states your position clearly and signals the main strands of your argument. [2]

(b) Write one topic sentence for each of three body paragraphs that would follow, each opening a distinct line of argument. Do not repeat the same point in different words across the three. [6]

Assessment focus

This question isolates two planning skills tested throughout a discursive coursework assignment: stating a clear, argument-signalling thesis, and opening each body paragraph with a topic sentence that advances a genuinely distinct line of reasoning rather than restating the thesis or drifting into description.

Model thesis statement (part a)

“While zoos present themselves as champions of conservation, keeping wild animals confined for public display is an outdated model that should be replaced by direct investment in habitat protection, in-situ breeding and community-led conservation overseas.”

This commits to a single position immediately (“should be replaced”) and foreshadows three strands the essay will go on to argue: the ethics of confinement, the relative value for money of the two approaches, and the case for community-led alternatives.

Model topic sentences (part b)

“The welfare cost of long-term confinement is difficult to justify against the entertainment value gained by a paying public.”
“Money spent building and maintaining enclosures could achieve far more for endangered species if redirected to protecting their habitat in the wild.”
“The educational case made for zoos is increasingly met just as well, and more accurately, by documentary film-making and immersive technology, without a single animal needing to be caged.”

Each sentence commits to a distinct, arguable claim (welfare, financial efficiency, and the education argument specifically) so the three paragraphs cannot collapse into repetition of a single idea.

Why this works

A strong thesis does two jobs at once: it takes a side, and it previews the shape of the argument so a reader knows what is coming. Weak theses often do only the first (a flat opinion with no signalled structure) or neither (a “some people think X, others think Y” straddle). Strong topic sentences do the equivalent job at paragraph level. Each one must be arguable on its own, not simply a fact about zoos, and each must open new territory rather than restating a point already made.

Common pitfalls specific to this task

Writing a thesis that only restates the task (“This essay will discuss whether zoos should exist”) instead of taking and signalling a position.
Using the same underlying objection (usually animal welfare) as the basis for two of the three topic sentences, just with different wording.
Writing topic sentences as questions (“Are zoos worth the cost?”) rather than as assertions the paragraph will go on to support.