If flowers have adapted to nocturnal pollinators, would they be more likely to stay open during the day or during the night?

during the night

Explanation:

the word "nocturnal" gives it away. most owls are nocturnal, and they stay out during the night and sleep during the day. same thing with bats, racoons, and other animals. a nocturnal plant must be out at night because there are nocturnal (night time) pollinators.

compost can be added to topsoil as a:

pesticide