I'd say to help the reader quickly locate geographic regions.
It's a ! cnidocytes help in defence and also in capturing prey ! so answer is A !!
This sounds like a test cross. Because P is dominant, the purple flower could have a genotype of Pp or PP. If all of the offspring of the test cross are purple, then the purple flower has genotype PP. If half of the offspring of the test cross have purple and half have white, then the purple parental flower's genotype is Pp.