Pond weeds normally lack thick layers of cuticle because
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2008
Which of the following statements about the transfer of energy in the ecosystem is correct?
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2008
What would be the effect of taking the lion out of the web?
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2008
Tertiary consumers within the web are
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2008
Which of the following activities constitutes biological control?
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2008
The following observations concerning succession are true except that the
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2008
The effects of environmental degradation caused by human activities can be controlled by e following measures except
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2008
The speed of the flow of water in a river is faster in the middle than along the banks due to
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2008
Which of the following statements about phenylthiocarbamide (PTC) is not correct?
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2008
Which of the following substances is not recycled in an ecosystem?
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2008
Conservation may be promote by
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2008
To avoid over fishing in a lake, the following measures may be helpful except
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2008
Many diseases caused by bacteria can be treated and cured by using
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2008
The effective cells involved in sickle-cell anaemia disease are
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2008
The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as
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2008
The observable characteristics of an individual usually resulting from the interaction between the gene composition and the environment is referred to as
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2008
Which of the following human traits in a class of school children may give an approximate normal distribution curve when the variation is plotted?
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2008
Which of the following characters is not an example of discontinuous variation?
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2008
If red is dominant to white and homozygous red pea-plants are crossed with homozygous white pea-plants, the first filial generation will have
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2008
The resemblance of a palatable insect to a poisonous insect is an example of