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give three ways in which a plant might be adapted to a hot dry environment a plant might be adapted to a hot dry environment by having a decreased
give three ways in which a polar bear is adapted to its environmenta polar bear is adapted to its environment by its high ratio of bulk to surface
what two biotic factors could affect an antelope living in the serengetithe biotic factors that may affect an antelope living in the serengeti could
what two abiotic factors might affect a an animal living at the bottom of the sea b a plant growing on a mountainside a the abiotic factors which
what is the distinction between interspecific competition and intraspecific competitioninterspecific competition takes place among organisms of the
what resources are competed for by a animals b plants a animals compete for food mates and shelter b plants compete for light water and
name three sources of energy which do not depend on fossil fuelsources of energy which do not rely on fossil fuel are water hydroelectric generation
in what ways can modern agriculture threaten the survival of speciesmodern agriculture destroys the natural vegetation eg woodland hedgerows on a
in what ways can we try to protect a species from extinction we can attempt to protect species from extinction by making it illegal to kill the
how could humans be disadvantaged by the extinction of a plant speciesthe loss of a plant species may deprive humans of any beneficial substances eg
in what ways could human activity lead to the extinction of a species in an areahuman activity could lead to extinction of a species by a
state two ways in which sulphur dioxide emissions from coal-fired generating stations could be reduced sulphur dioxide emissions can be reduced by
awhat do you understand by the term monoculture b what is one disadvantage of a monoculture a monoculture is the term applied to the growing of
in what way do chlorofluorocarbons cfcs cause global problemschlorofluorocarbons react with and deplete the ozone in the ozone layer this permits
explain briefly why greenhouse gases lead to global warmingthe greenhouse gases do not interfere with the short-wave radiation reaching the earth
which part of the carbon cycle is responsible for the enhancing concentration of carbon dioxide in the atmospherethe burning of fossilized products
a what are the two main pollutants that contribute to acid rain b where do these pollutants come from c what direct or indirect effect is acid rain
in what ways does over-grazing lead to soil erosionover-grazing leads to erosion because i the animals delete all the vegetation so exposing the soil
list the short-term and long-term effects of forest destruction a on hillsides b in the tropics a deforestation on hillsides exposes the soil
what are the principal sources of excessive nitrate and phosphate in rivers and lakes excessive nitrates and phosphates come majorly from sewage
a what is the special property of a persistent insecticide b in what ways is persistence i a useful property ii a harmful property a a persistent
distinguish among the terms pesticide insecticide and herbicide a pesticide is a compound which destroys or controls any organism which is
list three human activities which could cause the loss of a species human activities which threaten species with extinction are i hunting of
q what is tricuspid valve annuloplastyit depends upon the cause of tricuspid regurgitation specific therapy is directed towards the particular cause
q haemodynamics of tricuspid regurgitationright atrial pressure tracing shows a prominent lsquov wave and these cannot be appreciated in a patient