What's the secret of tulips?

Miss Qi, a TV actress, hid her jewels at the bottom of a pot of plants on the windowsill of her bedroom during a photo trip. Because, if you put it in the safe, it is easier to attract attention.

However, one spring night, when Miss Qi was traveling, the female thief Meggie sneaked in and shone through the window from the yard with a flashlight in her hand.

"Ah, that tulip is a bit strange. This is a fake flower. There must be valuables in it. "

After sneaking into the house, I really found a lot of jewelry from the bottom of the basin.

Guess, what is the difference between that tulip and other tulips?

Answer:

Potted plants.

A's tulips are in bud, and B's tulip petals are open. Maggie saw it and knew that B was a fake flower.

Why? Because tulips close their petals when the temperature drops at night, this is called "sleep exercise". Flowers and leaves will open or close due to light, temperature or external stimuli.

But when tulips bloom too big and start to wither, even at night, the petals will not close.