Why do morning glory flowers bloom at the morning and close at night? is there somebody helps it to close?....

It all boils down to genes. There are genes in the flower that tell it to close with a certain level of sunlight.


Just like certain plants which follow the sun - sunflowers. others whose leaves close at night - mimosa trees, others whose leaves close at touch - "mori/vivi" (I only know the Spanish name as I have only seen this small plant in Puerto Rico), other plants close their leaves with loud noise.


It all depends on genetics and gene expression: Some outside stimulus telling the organism what to do.

Why do morning glory flowers bloom at the morning and close at night? is there somebody helps it to close?....
SUNRAYS
Reply:It is plant genetics.
Reply:Yes, little fairies fly into them at night and close them. The next day the fairies have to squeeze out of the closed petals. They really make a good protected bed for the fairies as no fairy predators suspect that they're inside the flower.


I don't know how they bloom in the morning, I suspect that Mother Nature tells them to.
Reply:during the day it spreads out so it can take in more sunlight. The reason why it closes at night so the stomata cells close and thus the leaves hold up. I hope I made this simple enough. I hate the long drawn out answers.
Reply:The short answer is that it opens in the morning because its preferred pollinators operate in the morning. Like, if a flower wanted a moth pollinator, it might be white, open at night, and emit a moth-attracting fragrance (like a yucca flower.) Most flowers in the morning glory family open in the morning, but there are also four-o'-clocks (open in the afternoon) and moonflowers (open at dusk, or when it's dark.)





The long answer is, plants have cells that respond to different stimuli. So morning glory buds get light on them in the morning and then the cells stretch themselves and wake up and the flower unfurls. Or some plants just grow and grow and when it's time, they open up because they're too big to be folded up. Most flowers close when they've been properly pollinated, but morning glories just close because their day is done and more buds get a chance the next day.