IB ESS 2.5 Investigating Ecosystems

Organisms in an ecosystem can be identified using a variety of tools, except....

• Keys

• Comparison of specimen collections

• Technologies

• Best guess

Sampling strategies are used to measure all, except...

• biotic and abiotic factors that take place over a variety of habitats and environments without connection

• biotic and abiotic factors and their change in space

• biotic and abiotic factors along an environmental gradient

• biotic and abiotic factors over time

Suitable sampling techniques include _____, except

• random in a uniform environment

• systematic in a uniform environment

• systematic in a random environment

• transects over an environmental gradient

Measurements should be repeated to

• provide more data

• increase validity of data

• increase amount of data

• increase reliability of data

Methods for estimating the biomass and energy of trophic levels in a community include all, except...

• measurements of dry mass

• counting the number of organisms

• controlled combustion

• extrapolation from samples

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-4

Methods for estimating the abundance of non-motile organisms include all, except

• the use of quadrats for making actual counts

• measuring population density

• lincoln index

• percentage cover or frequency

An example of a direct methods for estimating the abundance of motile organisms

• actual counts

• capture-mark-recapture

• Lincoln Index

• using geographic information systems (GIS)

An example of an indirect method for estimating the abundance of motile organisms is

• keys

• quadrats

• capture-mark-recapture

• sampling

Species richness is

• the number of species in a population

• the number of species in a community

• the function of the number of species and their relative abundance

• the frequency of the number of species

Tags

NGSS.MS-LS2-5

Species diversity is

• the number of species in a community

• the number of species in a community

• the function of the diversity of species

• the function of the number of species and their relative abundance

Tags

NGSS.MS-LS2-5