MYP Biology: Human Impact on the Environment FAQs

Name the specific human activity first — not just 'pollution' but 'nitrate runoff from fertiliser use'. Then explain the biological mechanism causing change, and evaluate the consequences using data or a named case study. Command terms like 'discuss' or 'evaluate' expect balanced reasoning, not a one-sided description of damage.

MYP Biology's human impact strand usually covers habitat destruction, biodiversity loss, pollution (air, water and land), eutrophication, climate change effects on ecosystems, overexploitation of resources, and conservation or sustainability strategies. Exactly which subtopics you meet depends on your school's unit planner, since MYP allows schools flexibility in sequencing content within the subject guide.

Habitat destruction is the physical cause — clearing, draining or altering an ecosystem, like logging rainforest for palm oil plantations. Biodiversity loss is the consequence: a measurable drop in species richness, genetic diversity or population numbers within that habitat. In an exam answer, name the destruction as the mechanism and the biodiversity change as the measured outcome.

Walk through it as a chain: fertiliser nitrates run into a river, algae multiply rapidly (a bloom), the bloom blocks sunlight so submerged plants die, and decomposers break down the dead matter using up dissolved oxygen. Fish and invertebrates then suffocate. State each link explicitly — examiners mark the process, not just the label 'eutrophication'.

MYP Sciences assessment has four criteria — A (Knowing and understanding), B (Inquiring and designing), C (Processing and evaluating) and D (Reflecting on the impacts of science) — each marked out of 8, for 32 total. Human impact on the environment questions sit mainly under Criterion D, though strong answers also draw on Criterion A terminology and data.

The command terms that show up most in this topic are 'outline', 'explain', 'discuss', 'evaluate', 'justify' and 'to what extent'. 'Outline' just wants a brief account; 'discuss' and 'evaluate' need you to weigh evidence from more than one angle. Mixing these up is the single fastest way to lose Criterion D marks.

Structure a Criterion D response in four moves: state the specific impact, explain it with correct biological reasoning, weigh at least two perspectives — environmental against economic or social — and finish with a justified conclusion. Skipping the counter-perspective is the most common reason strong-sounding answers still cap out at level 5-6.

The most common mistake is describing the problem instead of evaluating it — writing 'deforestation destroys habitats and that's bad' without a mechanism, a figure, or a counter-argument. In fifteen years of marking these, the students who jump straight from level 4 to level 7 are the ones who add one concrete number and one opposing viewpoint.

Build a one-page glossary of key terms (eutrophication, biodiversity, bioaccumulation, carrying capacity), then practise past-style questions against each command term rather than re-reading notes. Testing yourself with timed, Criterion-D-style 'evaluate' or 'discuss' questions does more for your grade than another read-through of the textbook chapter.

Know a handful cold: Amazon deforestation for cattle and soy, the 1992 collapse of the Newfoundland cod fishery, coral bleaching on the Great Barrier Reef, and the Aral Sea, which has lost over 90% of its original surface area since the 1960s due to irrigation diversion. One well-chosen, well-quantified example beats five vague ones.

MYP human impact concepts feed straight into DP Biology's ecology and conservation content and overlap heavily with DP Environmental Systems and Societies (ESS), an interdisciplinary Group 3/4 course. According to the IB, first exams for the current DP Biology guide were 2025, and its ecology topics assume the ecological vocabulary and reasoning already built at MYP level.

In schools using the MYP on-screen eAssessment for Sciences, human impact questions typically appear as stimulus-based tasks — a graph, data table or short case-study extract you must interpret before answering. They're mapped across Criteria A to D, so expect both factual recall and an evaluative 'discuss' or 'justify' style question on the same stimulus.