These comprehensive video lessons help IB Biology students Standard Level (SL) and Higher Level (HL) understand and master the essential concepts needed for success in IB Exams. Each video focuses on C4.1 Populations and communities and is aligned with the IB Biology syllabus, ensuring focused learning on cell biology, genetics, and ecology. Students can watch and rewatch anytime, anywhere, perfect for visual learners, reinforcing complex concepts, and understanding IB methodology. By using RevisionDojo's video lessons consistently, learners build deep understanding and enter the exam with confidence.
Biology C4.1.1
C4.1.1 Populations
Biology C4.1.2
C4.1.2 Estimation of population size by random sampling
Biology C4.1.3
C4.1.3 Random quadrat sampling to estimate population size for sessile organisms
Biology C4.1.4
C4.1.4 Capture–mark–release–recapture and the Lincoln index
Biology C4.1.5
C4.1.5 Carrying capacity and competition for limited resources
Biology C4.1.6
C4.1.6 Negative feedback control of population size by density-dependent factors
Biology C4.1.7
C4.1.7 Population growth curves
Biology C4.1.8
C4.1.8 Modelling of the sigmoid population growth curve
Biology C4.1.9
C4.1.9 Competition versus cooperation in intraspecific relationships
Biology C4.1.10
C4.1.10 A community as all of the interacting organisms in an ecosystem
Biology C4.1.11
C4.1.11 Herbivory, predation, interspecific competition, mutualism, parasitism and pathogenicity
Biology C4.1.12
C4.1.12 Mutualism as an interspecific relationship that benefits both species
Biology C4.1.13
C4.1.13 Resource competition between endemic and invasive species
Biology C4.1.14
C4.1.14 Tests for interspecific competition
Biology C4.1.15
C4.1.15 Use of the chi-squared test for association between two species
Biology C4.1.16
C4.1.16 Predator–prey relationships
Biology C4.1.17
C4.1.17 Top-down and bottom-up control of populations in communities
Biology C4.1.18
C4.1.18 Allelopathy and secretion of antibiotics