Plant Stems Xylem vessels The functions of xylem tissue in a plant are: Vascular tissue that transports dissolved minerals and water around the plant Structural support Their cell walls contain lig...
Plant Cell Structure Plant cells contain most of the organelles found in animal cells, along with a few extra organelles that are only found in plant cells Cell wall Cell walls are formed outside o...
Conservation of Biodiversity When species go extinct it leads to an overall decrease in biodiversity In recent times many species have already gone extinct, while others are endangered An endangere...
Classification Taxonomy is the practice of biological classification The phylogenetic classification system enables us to arrange species into groups based on their evolutionary origins and evoluti...
Reproductive Isolation Organisms that belong to the same species share the same characteristics and are able to produce fertile offspring Reproductive isolation occurs when changes in the alleles a...
Hardy-Weinberg Equation Hardy-Weinberg Principle The Hardy-Weinberg principle states that if certain conditions are met, the allele frequencies of a gene within a population will not change from on...
Natural Selection can lead to Adaptation & Evolution Variation exists within a species population Variation refers to the differences between individuals. It can be interspecific (between diffe...
Ecological Niches & Adaptations Niche The place where a species lives within an ecosystem is its habitat The role that a species plays within its habitat is known as its niche, including: The b...
Comparing Biodiversity Between Habitats Once the abundance of different species in an area has been recorded, the results can be used to calculate the species diversity for that area Species divers...
