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Fish abundance in a pond was estimated by observing only near the shore. What is the main sampling problem?

Answer and explanation

Correct answer: The shore area may not represent the whole pond

Direct answer: Option A, the shore area may not represent the whole pond. A sample is a smaller part used to learn about a larger population. Fish may be distributed differently near the surface, bottom, deep water, plants, or open water. Observing only one shore location can therefore produce a biased estimate. Option A is correct because the chosen sample may not represent all habitats in the pond. Option B is wrong: fish can often be counted or estimated with suitable methods. Option C is wrong because pond water is not always opaque; even if visibility is poor, that is not the main sampling problem described. Option D is wrong because a count is numerical, or quantitative, data. Better sampling would include several representative locations and repeated observations. Memory cue: one place is not the whole population.

Related tags

Sampling BiasPond FishRepresentativenessScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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