I came across VERY interesting article which I would like to share with you :

Plants do complex arithmetic calculations to make sure they have enough food to prevent starvation at night, a new study has found. The research shows that to get through the night, plants perform accurate arithmetic division. The calculation allows them to use up their starch reserves at a constant rate so that they run out of it almost precisely at dawn.

Plants feed themselves during the day by using energy from the sun to convert carbon dioxide into sugars and starch. Once the sun has set, they must depend on a store of starch to prevent starvation. Scientists at the John Innes Centre showed that plants make precise adjustments to their rate of starch consumption. These adjustments ensure that the starch store lasts until dawn even if the night comes unexpectedly early.

During the night, mechanisms inside the leaf measure the size of the starch store and estimate the length of time until dawn. Information about time comes from an internal clock, similar to our own body clock. The size of the starch store is then divided by the length of time until dawn to set the correct rate of starch consumption, so that, by dawn, around 95% of starch is used up.

The calculations are precise so that plants not only prevent starvation but also make the most efficient use of their food. If the starch store is used too fast, plants will starve and stop growing during the night. If the store is used too slowly, some of it will be wasted.

How amazing!