Tulips belong to the Liliaceae family, which is commonly known as the lily family.
Holland. Also known as the Netherlands.
Paris
The Netherlands, once known as Holland.
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.
No
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.
The Netherlands are very famous for their tulips.
Tulips are angiosperms.
Tulips