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Tulips close at night , because when sun rises in the morning temperature of the atmosphere rises and rate of transpiration increases with the increase of temperature. so tulips cells loses water potential and become lose and become open. when day passed on and temperature become low than water potential increases and become tight so tulips close at night.

Flowers also close their petals to keep out 'the wrong type' of insect. Flowers that close their petals at night are called 'photonastic'.

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16y ago

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