"Step on them." Bumble bees are basically harmless. They are incredibly docile and very rarely respond aggressively to disturbance. I can't imagine any real need to destroy such an animal, especially one whose populations are currently in decline and who's abundance we do and will in the future rely on to pollinate most of the food we eat. If you really need a hive removed you should talk to some one like myself about it because such colonies are useful for research.
Yes, wasp and hornet sprays will also kill bumblebees. You can find wasp and hornet spray at retail stores such as Walmart or Target.
Yes, hornets are known to prey on bumblebees. They can capture and kill bumblebees to feed on their bodies or even bring them back to their nests to feed their young. This behavior is more common in certain hornet species, such as the Asian giant hornet.
They will kill your pet! Get him out of there! Then get rid of the bees
Most bumblebees hate water.
When bumblebees wake up from hibernation they usually reproduce.
No
That should be "Do bumblebees have a defence?". I'm pretty sure you realize that bees have stingers.
Snapdragons attract bumblebees by olfactory signals (scent). It is also known that bumblebees are attracted to certain colors of plants
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in there hive
in the hive
Water.