K.C.S.E Biology Q & A - MODEL 2011PP1QN21
What is meant by convergent evolution?
answer
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K.C.S.E Biology Q & A - MODEL 2010PP1QN24
Why is Lamark’s theory not acceptable?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN24
State two ideas proposed by Lamark in his theory of evolution.
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Explain why certain drugs become ineffective in curing a disease after many years of use.
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Give an example of a vestigial structure in human
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
How does convergent evolution occur
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
what is fossil
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN21
Give a reason why organisms become resistant to drugs
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN21
What is adaptive radiation
ANSWER
K.C.S.E Biology Q & A - MODEL 2006PP1QN15
Explain continental drift as an evidence of evolution.
answers
​Current continents existed as one large land mass/ Pingea/ Laureshia Guondaland; the present continent drifted leading to isolation of organisms; organism in each continent evolved along different lines hence emergence of new species,
K.C.S.E Biology Q & A - MODEL 2005PP1QN04
What is meant by
a) Organic evolution b) Continental drift?
ABSWERS
​a)It is the process through which ancient simpler forms of life under went gradual series of small changes for many million years, to give rise to the modern species of life // accepts as a theory formed one large single land mass, which later broke up into parts which drifted from one another forming the present day continents.
K.C.S.E Biology Q & A - MODEL 2004PP1QN14
What is meant by the following terms? Give an example in each case.
i) Homologous structures ii) Example iii) Vestigial structures Example
answers
​(i) Have a common ( embryonic) origin modified to perform different functions; vertebrae for limb/ pentadactyl limb
Example Vertebrate fore limb/ pretadactyl limb; acc beaks of birds ( fee of birds/ mouthparts in insects. (ii) Have different (embryonic) origins ( but have evolved) to perform similar functions. (iii) Are greatly reduced in size and therefore caused to function Acc. Third digit of wing of bird Halteres in flies Presence of hind limb ( buds) in python Human ear muscles Example Human appendix / kiwi ( flightless bird) with reduced wings/ vestigial wings in flies human hair/ presence of hind limbs in python; reduced pelvic girdle of whale.
K.C.S.E Biology Q & A - MODEL 2004PP1QN14
What is the difference between Darwinian and Lamarckian theories of evolution?
answers
Lamarckian
Inheritance of acquired characteristics/ Environment induces production of inheritable character which is then inherited.while Darwinian Inheritance of genetically acquired characteristics/ character happens to appear spontaneously which then gives advantage to organisms therefore better- adaptable characters are then inherited by natural selection.
K.C.S.E Biology Q & A - MODEL 2003PP1QN06.
Distinguish between analogous and homologous structures.
answers
​Analogous structures – structures which (appear similar and ) perform similar functions but have different origins.
Homologous structures – structures which have a common origin but (have evolved to ) perform different functions.
K.C.S.E Biology Q & A - MODEL 2002PP1QN14
Distinguish between divergent and convergent evolution giving example in each case.
answers
​Divergent basic structural form is modified to serve different functions; e.g. vertebrate forelimbs, break structure in birds/ feet in birds’ convergent different structures are modified to pass or similar functions e.g. wings and birds and insects/ eye of human and octopus, vertebrates for humans e.g. squeal, legs of vertebrae and insects .
K.C.S.E Biology Q & A - MODEL 2002PP1QN14
State two ways in which Home sapiens differs from Homo habilis
answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN14
What is organic evolution
answers
K.C.S.E Biology Q & A - MODEL 2000PP1QN07
Give reason why each of the following is important in the study of evolution:
a) Fossils records b) Comparative anatomy.
answers
(a) Fossils records
Gives evidence of types of plants/ animals/ organism that exist at a certain geological age. Long ago Gives evidence of morphological/ anatomical. Structure/ changes that have occurred over a long period of time. (b) Comparative anatomy. Gives evidence of relationship among organisms Gives evidence of common ancestry of a group of organisms; e.g. structural/ functional relationship among organization
K.C.S.E Biology Q & A - MODEL 1999PP1QN04
State two advantages of natural selection to organisms
answers
K.C.S.E Biology Q & A - MODEL 1998PP1QN19
Discuss the various evidences, which show that evolution has taken place.
answers
​Comparative anatomy/taxonomy.
K.C.S.E Biology Q & A - MODEL 1997PP1QN09.
State three pieces of evidence that support the theory of evolution
ANSWERS
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