2006-07-13 16:18:13 · 4 answers · asked by annu 1 in Science & Mathematics ➔ Botany
Flowers open at times convenient to pollination and close when it is not convenient. Hence some flowers open at sunrise ready for bees and other insects to pollinate them. Some cactus flowers open only at night to allow pollination by moths and are closed during the day.
2006-07-18 22:15:32 · answer #1 · answered by uselessadvice 4 · 0⤊ 0⤋
Because the flower needs the sun for a process called
photocyncisis
2006-07-13 16:23:23 · answer #2 · answered by clcalifornia 7 · 0⤊ 0⤋
flowers can open at different times, mostly depending on pollinator activity. lots of white trumpet-shaped flowers open at night for moths to visit; other plants open late in the afternoon (eg Evening Primrose); others open at day-break (eg Morning Glory).
"morning glory flowers, which are saucer-shaped, open at morning time, allowing them to be pollinated by hummingbirds, butterflies, bees and other daytime insects and birds. The flower lasts for a single morning and dies in the afternoon. New flowers bloom each day." (Wikipedia)
2006-07-13 21:30:10 · answer #3 · answered by myrtguy 5 · 0⤊ 0⤋
because the flower can use the sun to create energy. but when the sun goes down it can not make any more energy. but it takes more energy to keep the buds open than it is to close them at night and open them in the mouring. it is all about energy conservation.
and that process she is refering to is called photosynthesis.
2006-07-13 16:25:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋