Biology Topical Questions
EVOLUTION
1. 1989 Q7 P1 State the difference between Lamarckian and Darwinian theories of evolution. 2. 1991 Q17 P1 (a) What is meant by natural selection (b) Describe the natural selection brings about adaptation of a species to its Environment 3. 1992 Q5 P1 Two populations of the same species of birds were separated over a long period of time by an ocean. Both populations initially fed on insects only. Later it was observed that one population fed entirely on fruits and seeds, although insects were available.
K.C.S.E Biology Q & A - MODEL 2019PP1QN24
Explain the evolutionary basis for the ever changing drugs for malaria treatment.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN17
Below are photographs of two dogs.
​Explain the possible reason for the difference in the length of their fur.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN14
Name the evidence of organic evolution exhibited by occurrence of similar amino acid molecules in a range of organisms.
answers
(b) comparative physiology/ biochemistry/cell biology;
Acc. Serology /comparative serology.
K.C.S.E Biology Q & A - MODEL 2019PP1QN14
Explain why fossil records as evidence of organic evolution are usually incomplete.
answers
(a) partial/ entire decomposition of dead organisms/ organic matter;
Some parts of or entire dead organisms are eaten by scavengers; Soft bodied organisms do not fertilize; Destruction of parts due to natural disasters, like earthquakes/earth movements like, faulting /folding/ volcanicity/ mass movement; Distortion of parts of an organism due to sedimentary/ faulting/folding/volcanic
K.C.S.E Biology Q & A - MODEL 2018PP1QN22
What does the term evolution mean?
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN20
Give two illustrations of analogous structures in mammals.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN20
Define the term analogous structures.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN19
The diagrams below illustrate some forms of beaks in birds.
​(a) Which diagram represents the beak from which the others are likely to have evolved?
(b) Explain your answer in (a) above.
answers
​ (a) Beak M
(b) Beak M is simple/basic; original beak; the birds separated to occupy different niches; and specialized for different diets; leading to more complex/developed beaks over time;
K.C.S.E Biology Q & A - MODEL 2017PP1QN20
State three methods of fossil formation.
answers
​i. Petrification/change into rock;
ii. Entire organism or parts preserved; iii. Impressions (e.g. casts/moulds); K.C.S.E Biology Q & A - MODEL 2017PP1QN18
Below are diagrams representing developmental stages of three different vertebrates.
​(a) State the evidence of evolution illustrated by the vertebrates in the diagram.
(b) Suggest why the structure labelled J has been retained throughout the evolution of fish. (c) State two major advantages evolution has given humans Over most of the other animals.
answers
K.C.S.E Biology Q & A - MODEL 2016PP1QN06
Explain continental drift as an evidence of evolution.
answer
K.C.S.E Biology Q & A - MODEL 2015PP1QN10
The diagram below illustrates the skulls of adult human and chimpanzee.
​(a) State one difference between the two skulls in the following structures:
​(b) State the significance of the evolution observed on the parietal bone in the chimpanzee and human skulls.
answers
(b) Accommodate large sized brain in humans;
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
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