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Questions and Answers
1.Why has antibiotic resistance evolved in bacteria? (1mark)
a) All bacteria reproduce very quickly
b) Bacteria exposed to antibiotics developed a resistance to them
c) Varieties of bacteria resistance to antibiotics reproduce faster than non
resistant varieties
d) Bacteria showing resistance to antibiotics survive after antibiotics are
used.
2. Which of the following will promote variations in a species? (1mark)
a) Meiosis
b) Fertilization
c) Meiosis and Fertilization
d) Meiosis, Fertilization and Natural Selection
3.What is the mechanism of natural selection? (1mark)
a) Any individuals in a population can be selected entirely by change
b) After a change in the environment a species will evolve adaptation to the
new conditions
c) if an adaption to the environment it useful, an individual will develop it and
pass it on to its offspring
d) Variations amongst individuals of a population are selected by a changing
environment.
4.
5. What is Natural Selection. (2 marks)
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6. Explain the Theory of Evolution. (6 marks)
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7. Explain how natural selection can lead to evolution using antibiotic resistance
in bacteria as an example. (9marks)
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8. Explain How natural selection leads to evolution (8 marks)
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Answers
1.
2.
3.
4.
D
C
D
Database question
5. The Greater survival and reproduction success of individuals with
favorable heritable variations can lead to change in the characteristics of a
population.
6. Explaining Natural Selection:
1. Species tend to produce more offspring than the environment can
support.
2. There is a struggle for existence in which some individuals survive
and some die
3. In natural populations there is variation between individuals.
4. Some individuals are better adapted than other. An adaption is a
characteristic that makes an individual suited to its environment
and way of life.
5. Individuals that are better adapted tend to survive and produce
more offspring, while less well-adapted individuals tend to die or
produce fewer offspring so each generation contains more
offspring of better adapted than less well adapted individuals.
6. Individuals that reproduce pass on characteristic to their offspring.
7. The frequency of characteristics that make individuals betteradapted increases and the frequencies of other characteristics
decreases so species change and become better adapted.
7.
Long Answer Question
8.
Long Answer Question