K.C.S.E Biology Q & A - MODEL 2015PP1QN02
During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolutionary relationship.
(a) State the name given to the structure of the limbs observed by the students. (b) Name the type of evolution illustrated by the structure of the limbs observed. (c) What evidence of evolution is illustrated by the limbs? (d) State the significance of the type of evolution illustrated by the limbs.
answers
​(a) The pentadacty/ limb/homologous structures;
(b) Divergent evolution/adaptive radiation; (c) Comparative anatomy; (d) It allows the organisms to exploit different habitats to reduce competition;
K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Why are some bacteria able to resist the effect of antibiotics?
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Name two vestigial structures in human beings.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2013PP1QN21
What is meant by the term organic evolution?
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN21
Explain the role of continental drift in evolution.
answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN20
Explain the theory of evolution by natural selection.
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN26
(a) State the theories of evolution proposed by the following scientists.
(i) cell organelles (ii) fossils
answers
​(a) Theory of natural selection;
Theory of environmental influence on inherited characteristics; (b) (i) Similar organelles performing similar functions in different organisms suggest a common ancestry/cell biology; (ii) Fossil records/palaeontology/by comparing fossils to show phyllogenetic relationship between organisms/common ancestry;
K.C.S.E Biology Q & A - MODEL 2012PP1QN22
State the importance of divergent evolution to organisms.
answer
K.C.S.E Biology Q & A - MODEL 2011PP2QN02
Explain how comparative embryology is an evidence for organic evolution.
answer
K.C.S.E Biology Q & A - MODEL 2011PP1QN21
State two limitations of fossils as an evidence of evolution.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN21
What is meant by convergent evolution?
answer
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
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