Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
three ways in which food might become contaminated by harmful bacteriafood may become contaminated-i from the unwashed hands of a food-handlerii by
a give two examples of diseases which can be spread by contaminated drinking water b how can the spread of such diseases be prevented a typhoid
q a in droplet infection i where do the droplets come from ii what infective agents might they contain b give two examples of diseases normally
a what is the distinction among breathing and respiration b what part do ventilation and gaseous exchange play in these processes a breathing
which two gases are exchanged when living organisms breatheoxygen and carbon dioxide are the gases exchanged when living organisms
in what ways might a clothing b housing c writing have contributed to the survival of human beings a clothing and b housing provide warmth and
state two characteristics of humans which distinguish them from other primates two features which differentiate humans from other primates are their
which types of mammal are included in the primate group the primate group containsa lemursb monkeysc apes and
state the ways in which a all plant cells b some plant cells vary from animal cells a all plant cells have a cellulose cell wall b some
which invertebrate groups possess one three four or all of the features below segmented bodies hard exoskeleton jointed legs compound eyes three
which of the vertebrate classes a are warm-blooded b reproduce by laying eggs a birds and mammals are warm-bloodedb fish amphibia reptiles and
list the five kingdoms into which most living organisms can be classifiedmost living organisms can be classified asa bacteriab protozoac fungid
name three diseases caused by virusesthere are many diseases caused by virusvirus diseases include colds influenza herpes mumps measles chicken pox
give three examples of diseases caused by bacteriadiseases caused by bacteria contain tonsillitis blood poisoning scarlet fever tuberculosis typhoid
give one example in each case of the usefulness of bacteria in a a natural environment b an industrial process a in a natural environment bacteria
state three conditions in a society which could contribute to a reduction in the birth ratebirth rate might be decreased byi later marriages as
state the changes in society which could contribute to a falling death ratethe changes in society which could contribute to a falling death rate
what is meant by the expression infant mortality infant mortality refers to the number of babies in a population who die at the age of 1 year or less
what are likely to be the limiting factors in a population of a green plants b birds a in green plants the limiting factors are likely to be light
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