Multiple choice

An insecticide made from the dried flower heads of Chrysanthemum cinerarifolium is

  1. santonin

  2. pyrethrum

  3. ephedrine

  4. primaquin
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B Correct answer
Explanation

Pyrethrum is a natural insecticide extracted from dried flower heads of Chrysanthemum cinerariifolium (now classified as Tanacetum cinerariifolium). It contains pyrethrins which are neurotoxic to insects. Santonin is from Artemisia, ephedrine from Ephedra, and primaquine is synthetic.

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