Question

15) An island would most likely have a high degree of species diversity if it were:

a) large and near to an immigration source.

b) large and far from an immigration source.

c) small and far from an immigration source.

d) small and near to an immigration source.

16) A population will DECREASE most rapidly when

a) mortality (deaths) exceeds natality (births)

b) natality and mortality are equally high

c) natality and mortality are equally low

d) natality exceeds mortality

17) The science of ecology is best understood as

a) all of the species which occur in a particular area

b) the study of organisms in relation to one another and their environment

c) the surroundings which influence an organism

d) the study of the changes caused by humans which threaten other species

25) Keystone species _______.

a) can be removed from a community without affecting other species

b) are the primary producers in an ecosystem

c) have a particularly strong influence on the composition or function of a community

d) are the most numerous organisms in a community

e) are the species that are the most important nitrogen fixers in the N cycle

Answer 1

15B) species richness increases if the area is large(larger the area more will be its carrying capacity and lesser will be the competition)and far from immigration source (no foreign species invasion leads to development of balanced ecology and speciation)

16 a) if mortality(death rate) is more then natality(birth rate)there will be a rapid decline in population

17 b) branch of science which deals with interaction of biotic communities with each other and enviornment

25c)are the species which influences the complete environment of the area eg figs