YÖKDİL Fen Bilimleri Testleri - Okuma Parçası 1
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Soru 1 |
Scientists were initially unconvinced that the decrease in the number of amphibians – animals such as frogs that live on land and in water – was real, because amphibian populations are notorious for fluctuating widely. However, after statistical evidence showed that the declines were far more widespread than would reasonably be expected by chance, most researchers agreed that something was seriously wrong. Reports of declines and extinctions accelerated during the 1990s, and the observations indicated that something specific and troubling was happening to amphibians. At one locale in Costa Rica, 40 per cent of the local amphibian species disappeared over a short period. The loss of amphibian species not only contributes to the world’s biodiversity crisis but also has remarkable implications for the ecosystems where the declines occur. Without amphibians, links to food webs are broken, and other organisms suffer in often unpredictable ways. Although some of the earliest amphibian declines were recorded in the US, much of the scientific literature focuses on decreases in tropical countries, where losses have often been more dramatic and have involved a larger number of species. This has led to the curious problem of declines in temperate amphibian species receiving insufficient attention.
It is clearly stated in the passage that the decline in amphibian populations is disturbing because ----.
A | it may cause increases in other animal populations |
B | it is taking place at an alarming rate in the US |
C | amphibians are the only beings that live on land and
in water |
D | all amphibian species are on the verge of extinction |
E | it could lead to the destruction of the ecosystem
where it manifests itself |
Soru 2 |
Scientists were initially unconvinced that the decrease in the number of amphibians – animals such as frogs that live on land and in water – was real, because amphibian populations are notorious for fluctuating widely. However, after statistical evidence showed that the declines were far more widespread than would reasonably be expected by chance, most researchers agreed that something was seriously wrong. Reports of declines and extinctions accelerated during the 1990s, and the observations indicated that something specific and troubling was happening to amphibians. At one locale in Costa Rica, 40 per cent of the local amphibian species disappeared over a short period. The loss of amphibian species not only contributes to the world’s biodiversity crisis but also has remarkable implications for the ecosystems where the declines occur. Without amphibians, links to food webs are broken, and other organisms suffer in often unpredictable ways. Although some of the earliest amphibian declines were recorded in the US, much of the scientific literature focuses on decreases in tropical countries, where losses have often been more dramatic and have involved a larger number of species. This has led to the curious problem of declines in temperate amphibian species receiving insufficient attention.
According to the passage, the disappearance of amphibians was not taken seriously at first, because ----.
A | amphibians had never been on the endangered
species list
|
B | fluctuations in amphibian populations were on a very
small scale
|
C | changes in the numbers of amphibians were often
unstable
|
D | the initial declines had not been properly researched
|
E | statistical evidence did not point to such a decline |
Soru 3 |
Scientists were initially unconvinced that the decrease in the number of amphibians – animals such as frogs that live on land and in water – was real, because amphibian populations are notorious for fluctuating widely. However, after statistical evidence showed that the declines were far more widespread than would reasonably be expected by chance, most researchers agreed that something was seriously wrong. Reports of declines and extinctions accelerated during the 1990s, and the observations indicated that something specific and troubling was happening to amphibians. At one locale in Costa Rica, 40 per cent of the local amphibian species disappeared over a short period. The loss of amphibian species not only contributes to the world’s biodiversity crisis but also has remarkable implications for the ecosystems where the declines occur. Without amphibians, links to food webs are broken, and other organisms suffer in often unpredictable ways. Although some of the earliest amphibian declines were recorded in the US, much of the scientific literature focuses on decreases in tropical countries, where losses have often been more dramatic and have involved a larger number of species. This has led to the curious problem of declines in temperate amphibian species receiving insufficient attention.
It is mentioned in the passage that ----.
A | the US has the most varied amphibian species |
B | the first reports of amphibian declines only dealt with
frogs |
C | the increase of amphibians can cause other species
to become extinct |
D | amphibian populations are an important part of the
food chain in many ecosystems |
E | the decrease in the number of amphibians was
exaggerated |
Soru 4 |
Scientists were initially unconvinced that the decrease in the number of amphibians – animals such as frogs that live on land and in water – was real, because amphibian populations are notorious for fluctuating widely. However, after statistical evidence showed that the declines were far more widespread than would reasonably be expected by chance, most researchers agreed that something was seriously wrong. Reports of declines and extinctions accelerated during the 1990s, and the observations indicated that something specific and troubling was happening to amphibians. At one locale in Costa Rica, 40 per cent of the local amphibian species disappeared over a short period. The loss of amphibian species not only contributes to the world’s biodiversity crisis but also has remarkable implications for the ecosystems where the declines occur. Without amphibians, links to food webs are broken, and other organisms suffer in often unpredictable ways. Although some of the earliest amphibian declines were recorded in the US, much of the scientific literature focuses on decreases in tropical countries, where losses have often been more dramatic and have involved a larger number of species. This has led to the curious problem of declines in temperate amphibian species receiving insufficient attention.
Following the focus on the decline of amphibian species in tropical countries, ----.
A | no information is available on what caused the
earliest amphibian declines |
B | dramatic amphibian declines are becoming less of a
problem in these areas |
C | efforts are now being directed to declining
amphibians in temperate areas |
D | little attention has been paid to amphibians in Costa
Rica |
E | scientists are able to understand what is happening
to amphibians worldwide
|
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