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 is taking place at an alarming rate in the US |
B | all amphibian species are on the verge of extinction |
C | amphibians are the only beings that live on land and
in water |
D | it could lead to the destruction of the ecosystem
where it manifests itself |
E | it may cause increases in other animal populations |
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 | changes in the numbers of amphibians were often
unstable
|
B | fluctuations in amphibian populations were on a very
small scale
|
C | amphibians had never been on the endangered
species list
|
D | statistical evidence did not point to such a decline |
E | the initial declines had not been properly researched
|
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 | amphibian populations are an important part of the
food chain in many ecosystems |
B | the increase of amphibians can cause other species
to become extinct |
C | the decrease in the number of amphibians was
exaggerated |
D | the US has the most varied amphibian species |
E | the first reports of amphibian declines only dealt with
frogs |
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 | little attention has been paid to amphibians in Costa
Rica |
B | no information is available on what caused the
earliest amphibian declines |
C | scientists are able to understand what is happening
to amphibians worldwide
|
D | efforts are now being directed to declining
amphibians in temperate areas |
E | dramatic amphibian declines are becoming less of a
problem in these areas |
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