Effects of the Environment on Organisms (HSC SSCE Biology): Quizzes

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Selection Pressures in an Ecosystem
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What are selection pressures?

Environmental factors affecting survival

Why is biodiversity essential when selection pressures occur?

Variation allows some individuals to survive

What does abundance refer to in ecology?

How many individuals of a species exist

Which are main abiotic factors in terrestrial environments?

Temperature, light, water availability

Which is a biotic selection pressure?

Number of predators

Ten 1 m² quadrats totalled 540% cover. If area is 250 m², what is grass cover area?

135 m²

What size is a standard quadrat frame?

1 m × 1 m

Using N=M×nmN = \frac{M \times n}{m}, if M=20M=20, n=50n=50, m=10m=10, what is NN?

100

What does mark-release-recapture assume?

No migration, births, or deaths occur

What is a disadvantage of quadrat sampling?

Only suits plants and slow-moving animals

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