what is meant by the following ecological terms
a). conservation
b). biodiversity
c). endangered species
Answers
Answer:Their population growth, reduction or disappearance indicates specific changes in the environment, making them a useful means of monitoring change
Indicator species may be sensitive to a number of different environmental conditions:
Lichen, along with mosses, are susceptible to air-borne pollutants dissolved in water (e.g. sulphur dioxide)
Tubifex worms are sensitive to concentrations of heavy metals
Mayfly larvae and certain aquatic invertebrates are sensitive to dissolved oxygen levels in water
Biotic indices compare the relative frequency of indicator species and is calculated to provide an overall environmental assessment of an ecosystem
Calculating biotic indices involves multiplying the population size of each indicator species by its pollution tolerance rating
A high biotic index indicates an abundance of pollution sensitive organisms and hence denotes an unpolluted environment
A low biotic index indicates the absence of indicator species and an abundance of pollution tolerant organisms (hence a polluted environment)
A change in the biotic index over time marks a change in the environmental conditions within the ecosystem
Answer:
1.preserve
2.our surrounding and the different types of organisms
3.the species that are very less in number and is going to be extint