Biodiversity, Variation & Ecosystem Resilience — Drills · Grade 7 Science
Chapter: Ecological Evidence & Environmental DesignWhat these drills covers
By the end of Biodiversity, Variation & Ecosystem Resilience you should be able to:
- I can explain biodiversity, variation & ecosystem resilience.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice, numeric and written answer, each with a worked explanation.
Vocabulary used: biodiversity, species richness, abundance, evenness, resilience.
Problem 1
Which sample has greater observed richness?
- Ten of one species
- Ten distributed across four species
- Both must equal ten species
- Neither can be counted
Answer and explanation
Ten distributed across four species
Four detected species is greater richness than one, even with equal individual totals.
Problem 2
A survey detects two plant, three insect, and one bird species with no overlap. Find observed richness.
Answer and explanation
6 species
2+3+1=6 detected species under the stated categories.
Problem 3
Can equal individual totals have different richness?
Answer and explanation
Yes. Individuals may belong to different numbers of species.
Problem 4
Why is diversity not a guarantee against complete habitat loss?
Answer and explanation
Varied organisms still depend on habitat and resources; a sufficiently broad disturbance can remove those conditions.