Pyrethrum is a natural insecticide derived from the flowers of Chrysanthemum cinerariifolium.
It is the source of pyrethrins, which are neurotoxins for insects.
Others like permethrin and cypermethrin are synthetic pyrethroids, and imidacloprid is a neonicotinoid.
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120 Mins English English100 Questions100 Marks120 Mins English English60 Questions60 Marks45 Mins EnglishFor restoration of highly degraded areas, plantation of which is recommended?
The equation to estimate soil loss by wind erosion is , in which K stands for
| Set A |
Set B |
| [i] Robinson |
[a] Pipette method |
| [ii] Yoder |
[b] Wet sieving |
| [iii] Munsell |
[c] Colour chart |
| [iv] Atterberg |
[d] Consistency limits |
| Set A (Scientist) |
Set B (Contribution) |
| [i] Thomas Way |
[a] Borax |
| [ii] Thomas Graham |
[b] Ammonium molybdate |
| [iii] Sorenson |
[c] Copper sulphate |
| [iv] Schofield |
[d] Zinc sulphate |
Which one of the following is the active factor of soil formation?
The process of enrichment of surface water bodies with nutrients is called
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