Challenge #18 Question 1. Some plants contain substances that cause moderate to severe reactions when eaten by humans. Which of the following plants has a part (flower, berry, leaf, root, bulb, etc.) that is "poisonous" to humans? a) Rhubarb, b) oleander, c) daffodil, Answer: ALL THREE have poisonous parts: a) Rhubarb leaves contain cyanogenetic glycosides b) Oleander - all parts contain cardiac glycosides c) Daffodil bulbs contain toxic alkaloids. Correct answer received from: Daniel M. (youth), Jason Coffer