Civil Services Prep

Prelims 2021 · Science and Technology · Question 21

Which one of the following is used in preparing a natural mosquito repellent?

  1. Congress grass
  2. Elephant grass
  3. Lemongrass
  4. Nut grass

Answer

Lemongrass

  • (a) Congress grass: Parthenium hysterophorus is an invasive weed and a known allergen; it is not used for making natural mosquito repellents. Verdict: Incorrect.
  • (b) Elephant grass: Mainly used as fodder and for biomass; it has no standard use as a natural mosquito repellent. Verdict: Incorrect.
  • (c) Lemongrass: Lemongrass oil contains citral/citronella-type compounds and is commonly used in natural mosquito repellents. Verdict: Correct.
  • (d) Nut grass: Cyperus rotundus is known more as a weed/medicinal plant, not a standard source for mosquito repellent preparation. Verdict: Incorrect.
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