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biology 0610printed 254 · PDF 254
328 pagesrevision 46933
printed 254 · PDF 254
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Aitchison College Academic Resources.
Answers:
1.
D: The answer is D because blood groups and seed color are both
examples of discontinuous variation while body mass is an example
of continuous variation. So, D is the only right answer.
. B: We know that humans have nothing to do with natural selection,
so option 3 is incorrect. So the only correct answer can be B.
. D: Here, option D is correct as a wavy cuticle is a feature of a
xerophyte and thus hydrophytes do not contain them whereas options
A,B and C are all adaptive features that increase conservation of
water and are thus wrong.
. A: The first two options here are correct as in both natural and
artificial selection specific individuals reproduce and then give alleles
to their offspring but in artificial selection, organisms do not compete
with each other as humans select and breed them. So option 3 is
incorrect and the answer is A.
. ©: Cis the correct answer because a thick waxy cuticle and leaves
shrunken to spines are both adaptive features of xerophytes reducing
water loss, while stomata and green color of chlorophyll causing
increased photosynthesis cause increased water loss and are thus
not part if their adaptive features.
. D: Here, D is the correct answer because selective breeding is done
between two desirable parents and involves no competition and
human involvement.
. ©: Option C is the only correct answer because discontinuous
variation is caused mainly by genetic factors, radiation increases the
rate of mutation and variation in height is an example of continuous
variation.
. C: Xerophytes contain stomatal hair to trap moisture and reduce
water loss by diffusion, and rolled leaves to reduce surface area for
water loss by photosynthesis so option C is correct.
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