Biology 2010 | Study Mode

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Question 31

The vector for yellow fever is

Aedes mosquito

Anopheles mosquito

tsetse fly

blackfly

Explanation

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Correct option: A

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Question 32

The loss of soil through erosion can be reduced by

watering

crop rotation

manuring

irrigation

Explanation

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Correct option: B

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Question 33

The protozoan plasmodium falciparum is transmitted by

female Anopheles mosquitoes

female Aedes mosquitoes

female Culex mosquitoes

Female blackfly

Explanation

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Correct option: A

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Question 34

A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of

taste bud variation

discontinuous variation

morphological variation

continuous variation

Explanation

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Correct option: B

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Question 35

Thyroxine and adrenalin are examples of hormones which control

blood grouping

tongue rolling

behavioural patterns

colour variation

Explanation

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Correct option: C

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Question 36

A pair of genes that control a trait is referred to as

an allele

recessive

dominant

a hybird

Explanation

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Correct option: A

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Question 37

The chromosome number of a cell before and after the process of meiosis is conventionally represented as

2n 2n

n n

n 2n

2n n

Explanation

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Correct option: D

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Question 38

At what stage in the life history of a mammal is the sex of an individual set?

at adolescence

at puberty

at birth

at conception

Explanation

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Correct option: D

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Question 39

The main distinguishing features between the soldier termite and other members of the caste are the

presence of wings, possession of a small head and large thorax

presence of wings, possession of a large thorax and a small head

absence of wings, possession of strong mandibles and a large head

absence of wings,possession of big head and the absence of mandible

Explanation

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Correct option: C

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Question 40

The flippers of a whale and the fins of a fish are examples of

divergent evolution

coevolution

continous variation

convergent evolution

Explanation

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Correct option: D

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