CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 14
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Name Date
End-of-chapter 14 test
1 Scientists in Russia have been successful in germinating and growing a seed of a plant
called Silene that had been buried deep in Siberian permafrost. The seed had been buried
by animals and had been frozen in underground ice for over 30 000 years.
a Suggest two reasons why the seed did not germinate during the 30 000 years.
i _________________________________________________________________________
_________________________________________________________________________
ii _________________________________________________________________________
_________________________________________________________________________ [2]
b Figure 14.1 shows the structure of the flowers of (a) modern and (b) ancient Silene.
Figure 14.1
i Silene produces large white flowers that are pollinated by insects. Identify which
row shows other characteristics of insect-pollinated flowers.
Strong scent Number of pollen grains produced Surface of pollen grains Surface of stigma
A yes moderate spiky sticky
B no moderate smooth feathery
C yes very high spiky sticky
D no very high smooth feathery
____ [1]
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CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 14
ii Modern and ancient Silene plants may not be able to reproduce together. Suggest why.
_________________________________________________________________________
_________________________________________________________________________ [1]
iii Most of the flowers produced on the ancient Silene plant were female. Identify
two flower structures that are absent in a female flower.
1 _____________________________________________________________________
2 _____________________________________________________________________ [2]
[Total: 6]
2 a In the box below, make a large drawing of the modern Silene flower as it appears in
Figure 14.1 (a). Label a stamen on your drawing.
[5]
b i Draw a straight line between the lines labelled P and Q on the diagram in Figure 14.1 (a).
Measure and record the length of your line.
Measurement: _______________ mm
[1]
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CAMBRIDGE IGCSE™ BIOLOGY: END-OF-CHAPTER TEST 14
ii Draw a straight line in a similar position on your drawing. Measure and record
the length of your line.
Measurement: _______________ mm
[1]
iii Calculate the magnification of your drawing. Show your working.
Magnification = ____________
[2]
c Like most plants, Silene can reproduce both sexually and asexually.
Outline the advantages and disadvantages of asexual reproduction for a population of plants.
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________ [5]
[Total: 14]
[Test total: 20]
END OF TEST
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