The following effects are associated with deforestation except
A
gully erosion
B
extinction of plant species
C
migration of wildlife
D
increase in rainfall
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43
The main reason for the conservation of wildlife is to
A
create national parks for recreation
B
maintain ecological balance in communities
C
prevent hunters from being 'cruel to animals
D
save some species from extinction.
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44
Which of the following is an example of variation?
A
Blood
B
Tongue rolling
C
Reproduction
D
Growth
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45
The parameters of size, height, weight and colour in a population of living things are examples of
A
environmental variation
B
non-heritable variations
C
continuous variations
D
discontinuous variations
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46
Fingerprints are useful in crime detection because
A
the police have sophisticated fingerprint machines
B
thieves may leave their prints at the scene of a crime
C
no two people have the same fingerprint
D
fingerprints are easy to make
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47
A person with blood group, O can be given blood from persons who have blood belonging to
A
group O only
B
group A only
C
groups A and O
D
groups A, B and O
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48
A man heterozygous for albino gene marries a woman who is also heterozygous for the gene. Both have normal skin colour. The probability that they will have an albino child is
A
1/3
B
1/4
C
4/4
D
2/4
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49
Which of the following statements about heredity is not true? In heredity the traits are
A
carried by genes
B
contained in the ovum and sperm
C
always transmitted by one parent
D
transmitted from parents to offspring
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50
An example of a saprophytic relationship is a / an
