Context: Pesticides can be classified based upon their biological mechanism function or application method. Most pesticides work by poisoning pests. A systemic pesticide moves inside a plant following absorption by the plant. With insecticides and most fungicides, this movement is usually upward (through the xylem) and outward. Increased efficiency may be a result. Systemic insecticides, which poison pollen and nectar in the flowers[citation needed], may kill bees and other needed pollinators[citation needed].

Question: What is one way you could group pesticides?
Answer: application method

Question: What is the main way that peticides perform their function?
Answer: by poisoning pests

Question: In which direction do systemic pesticide generally travel through a plant?
Answer: movement is usually upward

Question: Which parts of a plant do systemic pesticides generally attack?
Answer: pollen and nectar in the flowers

Question: What traits are used to classify types of flower nectar?
Answer: Unanswerable

Question: How does nectar move up through a plant?
Answer: Unanswerable

Question: Why does a plant move nectar through the xylem?
Answer: Unanswerable

Question: How do some flowers protect themselves from harm?
Answer: Unanswerable

Question: What does a plant use to attract pollinators?
Answer: Unanswerable