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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
The plant pesticide pyrethrum is obtained from:
  • A
    Cinchona officinalis
  • B
    Chrysanthemum  cinerariifolium
  • C
    Chrysophyllum cainito
  • D
    Cannabis sativa
✓

Answer

  1. Chrysanthemum  cinerariifolium

Explanation:

Pyrethrum is a genus of plants which are cultivated as ornamentals. It is a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium. Pyrethroids are synthetic insecticides derived from natural Pyrethrum (pyrethrins). The compound enhances the effect of toxicity to insects. These compounds target the nervous system of the insects. They are commonly used as insect repellants.

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