Ecological Sampling & Diversity Data — Drills · Grade 12 Science
Chapter: Ecology, Populations & BiodiversityWhat these drills covers
By the end of Ecological Sampling & Diversity Data you should be able to:
- I can plan representative independent ecological samples.
- I can calculate density and a specified diversity index while checking assumptions.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: quadrat, richness, evenness.
Problem 1
20 individuals in 5 m² gives what density?
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
4 individuals/m²
20/5=4.
Problem 2
Why randomize quadrat placement?
Answer and explanation
To reduce selection bias and improve representativeness for the defined habitat.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.