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The
acidity/alkalinity of the solutions did affect the survival and
growth of the tadpoles. Out of 65 tadpoles, 46 (or 70.77%) died
and 19 (or 29.23%) lived, over a span of 28 days. |
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The
average increase in growth for the control tadpoles is 77.67% of
the original average length of the tadpoles. The average increase
in growth for the other tadpoles range from 42.86% - 100%. |
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In
our experiment, the extremities of pH values may not cause stunted
growth in the tadpoles. In the case of the pondwater cum hydrochloric
acid solution (pH 4.0), the average increase in growth of the tadpoles
was 66.67%, while the same solution with the pH value 5.5 had an
average increase in growth of 58.33%. |
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According
to the results of our experiment, the greatest increase in growth
is the tadpoles in the pondwater cum calcium hydoxide solution (pH
8.5), with a percentage increase of 100. The solutions with
the greatest number of deaths are pondwater cum sulphuric acid solution
(pH
5.5), pondwater cum ammonium hydroxide solution
(pH
10.0) and pondwater cum sodium hydroxide solution (pH 8.5), all
of which 100% of the tadpoles died. The solutions with the
greatest number of tadpoles alive are pondwater cum nitric acid
solution (pH 4.0) and pondwater cum sulphuric acid solution (pH
4.0), and the control pondwater (pH 7.0), all of which 60% of the
tadpoles lived. |
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While
the acidity/alkalinity may have affected the survival and growth
of the tadpoles, we are not sure to what extent. The deaths or stunted
growth could have been due to certain chemical properties of the
acids/alkalis. The tadpoles could also have died due to natural
causes. |
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Therefore
we conclude that the American bullfrog tadpoles survive and grow
best in pondwater (pH 7.0), with 60% of the tadpoles living and
an average increase in growth of 77.67%. |
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However
we recognise that our results may be inaccurate, as we did not have
sufficient time and resources, to carry out more experiments over
a longer span of time which would give us more general and accurate
results. |
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