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biology 0610printed 253 · PDF 253
328 pagesrevision 46933
printed 253 · PDF 253
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33 Which statement is correct?
A
B
c
D
Discontinuous variation is mainly caused by environmental factors.
lonising radiation and some chemicals decrease the rate of mutation.
A gene mutation is a change in the base sequence of a DNA molecule.
Small variations in height within a human population are an example of discontinuous
variation.
34 Which adaptation may be present in a xerophyte?
A
B
leaves with small surface area and large numbers of stomata
little or no xylem tissue and leaves with large surface area
stomatal hairs and rolled leaves
thin or no cuticle and deep roots
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