If you mean "Holland tulips", it means tulips from Holland.
There are no specific collective noun for tulips. I have seen suggested, an explosion of tulips and a tiptoe of tulips. However, any noun suitable for the situation can be used, for example, a field of tulips, a bouquet of tulips, a bunch of tulips, etc.
If you are saying that "1 in 4" of the tulips are red, the answer would be 4 of the tulips are red.
No, tulips are multicellular organisms.
Tulips
Tulips are angiosperms.
Tulips Tulips
Tulips are bulbs
Tulips are a spring bulb.
Yes. Tulips are endangered. Especially the Cyprus tulips and Motley tulips. Mostly all the species of tulips are endangered,depending on what type they are and what they produce. Lots of tulips like the Motley,Cyprus,etc.,hold benefits and look great in your garden but that might not be for long.
tulips are grown from bulbs
are tulips in the rain forest