Seeds kept in a refrigerator do not germinate because

they become very cold.

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they lose viability.

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refrigerator doesn't provide optimum temperature.

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it does not get sunlight.

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Solution

The correct option is C refrigerator doesn't provide optimum temperature.
Seed germination requires a suitable warm temperature. Both very low and very high temperatures are unsuitable for germination. The temperature inside a refrigerator varies between 5 $^{\circ}$ C to 20 $^{\circ}$ C and this is certainly very low temperature. Therefore, the seeds kept in refrigerator do not germinate.

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