IB Biology SL C4.1 Populations and Communities Question Bank

Practise IB Biology SL C4.1 by estimating populations, modelling growth and interpreting competition, cooperation and community relationships.

Exam points

select quadrats or mark-recapture and calculate a population estimate from appropriate field data
interpret limiting factors, carrying capacity and phases of sigmoid population growth
classify community relationships from effects on each species and evidence of exchanged resources
evaluate how an invasive species alters competition, food webs or survival of endemic populations
use observed and expected quadrat counts, degrees of freedom and critical values to interpret a chi-squared test

Covered syllabus points

C4.1.1—Populations C4.1.2—Population size estimation C4.1.3—Random quadrat sampling C4.1.4—Capture-mark-release-recapture C4.1.5—Carrying capacity C4.1.6—Negative feedback control C4.1.7—Population growth curves C4.1.8—Modelling sigmoid growth C4.1.9—Competition vs. cooperation C4.1.10—Community C4.1.11—Interspecific relationships C4.1.12—Mutualism as interspecific relationship C4.1.13—Endemic vs. invasive species C4.1.14—Tests for interspecific competition C4.1.15—Chi-squared test C4.1.16—Predator-prey relationships C4.1.17—Top-down vs. bottom-up control C4.1.18—Allelopathy and antibiotics

[Maximum number: 1]

What is a population?

Organisms of the same genus living in an ecosystem

Organisms living together and interacting in the same habitat

Organisms of a species living together in the same area

Organisms that can breed together

[Maximum number: 1]

In an area of forest measuring 100 m by 100 m , samples were taken to estimate the number of silver maple (Acer saccharinum) trees in the forest. The number of trees counted in each of five areas of $400 \mathrm{~m}^{2}$ was recorded.

Figure for Question C4.1 Populations and communities question 2 — IB Biology SL

Approximately how many silver maple trees are in the $10000 \mathrm{~m}^{2}$ area of forest?

125

625

[Maximum number: 2]

A school football field has plantain plants (Plantago media) growing on it as well as grass. Each plantain plant has a short stem with a circle of wide leaves. Outline how the size of the plantain population could be estimated using a quadrat method.

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Covered syllabus points

C4.1 Populations and communities question 1

C4.1 Populations and communities question 2

C4.1 Populations and communities question 3