Practise IB ESS SL 2.1 by identifying species and interactions, designing sampling methods and explaining how resources and feedback shape populations.
Define the term species.
Figure:Aquatic organism image A
Figure:Aquatic organism image B
Figure:Aquatic organism image C
Figure:Aquatic organism image D
The organisms shown below (not drawn to scale) were found in an aquatic ecosystem.
Aquatic-organism context: use the four organisms shown in the protected the four aquatic organisms shown above visual when constructing or evaluating an identification key.
Suggest two visible characteristics of the organisms shown above which could be used to construct an identification key.
Aquatic-organism context: use the four organisms shown in the protected the four aquatic organisms shown above visual when constructing or evaluating an identification key.
Identify one limitation of using a key to identify an organism.
Figure:Some trees found in the forests of California
Using Figure: Some trees found in the forests of California and the identification key below, identify species A and species B.
Figure:Giant sequoia cones containing seeds
Figure:Long-horned beetle
With reference to Figures: Giant sequoia cones containing seeds and Long-horned beetle, state the species interaction between the giant sequoia (Sequoiadendron giganteum) and the long-horned beetle (Phymatodes nitidus).
Figure:Four species of the family Leporidae
Figure:A dichotomous key for species A to D
Figure:Sagebrush ecosystem without invasive cheatgrass
Figure:Sagebrush ecosystem with invasive cheatgrass
The family Leporidae includes hares and rabbits. The figures show four species that can be found in western North America.
Use Figures: Four species of the family Leporidae and A dichotomous key for species A to D to identify Species B and Species C.
The sagebrush ecosystem provides a habitat for pygmy rabbits. Suggest one reason why there might be a greater number of pygmy rabbits in the ecosystem shown in Figure: Sagebrush ecosystem without invasive cheatgrass than in the ecosystem shown in Figure: Sagebrush ecosystem with invasive cheatgrass.
Describe one method to determine the impact of invasive cheatgrass on sagebrush density.