Insecticides Solved Questions

Insecticides Solved Questions With Explanations

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Table 01: MCQ on Insecticide

1.C6.D
2.D7.A
3.A8.B
4.D9.C
5.C10.B
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Table 02: Quiz on Insecticide

11.C16.B
12.B17.A
13.D18.B
14.A19.A
15.D20.D
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Table 03

21.A26.C
22.C27.A
23.A28.A
24.A29.B
25.C30.D
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Explanation 01

Stomach poision

  • Examples of inorganic compounds: Lead arsenate, sodium fluosilicate, zinc phosphide, Paris green, etc.
  • Examples of organic compounds: Pyrethrum, nicotine, rotenone, etc.
  • Examples of elemental compounds: Sulfur, phosphorus, thallium, mercury, etc.
  • Examples of synthetic organic compounds: DDT, malathion, carbaryl, etc.
  • Examples of poisonous gases: Hydrogen cyanide, ethylene dichloride, methyl bromide, phosphine, etc.

Explanation 02

Stomach poisons are generally used against insects with chewing type of mouthparts, and under certain conditions against those with sponging, lapping or sucking mouthparts.

Explanation 03

Systemic insecticides are applied to seeds, roots, stems or leaves of plants, and after the absorption they are translocated to various parts of the plant in amounts lethal to insects which feed on them.

Explanation 04

Contact poisons are very common type of Insecticides. They are very efficive against the soft bodied insects. Examples of some contact poisons are as follows:

  • Carbaryl.
  • Aldicarb.
  • Carbofuran.
  • DDT.
  • Aldrin.
  • HCH.

Explanation 05

Fumigants are very effective in store houses. In a partial vacuum, longer exposure is necessary at a lower temperature than 21-37°C.

Explanation 06

The following factors affect the effectiveness of insecticide:

  • Physical properties.
  • Penetration of insecticide through the cuticle.
  • Weather conditions.
  • Conditions in the field.
  • Compatibility.
  • Application of pesticides.

Explanation 07

Oral LD50 (mg/kg) of some insecticides are as follows:

  • DDT: 113.
  • Monocrotophos: 21.
  • Parathion: 13.
  • Aldrin: 39.
  • Pyrethrum: 470.

Explanation 08

Dermal LD50 (mg/kg) of some insecticides are as follows:

  • DDT: 2510.
  • Monocrotophos: 112.
  • Parathion: 21.
  • Aldrin: 98.
  • Pyrethrum: 1880.

Explanation 09

  • Endrin: 17.8.
  • Mephosfolan: 14.
  • Mevinphos: 6.1.
  • Monocrotophos: 21

Explanation 10

  • Dicofol: 1100.
  • Methoxychlor: 5000.
  • Bromophos: 3750.
  • MMenazon: 1200.

Explanation 11

  • Carbaryl: 4000.
  • Phorate: 6.2.
  • Carbocxin: 8000.
  • DNOC: 600.

Explanation 12

  • Ethyl mercuric salt: 30.
  • TEPP: 2.
  • Carbofuran: 8.
  • Schradan: 5.

Explanation 14

Insecticide formulation is the commercial form of any insecticide.

Some formulations are as follows:

  • WP or wettable powder.
  • EC or Emulsifiable concentrate.
  • Dust.
  • Granules, etc.

Explanation 15

  • Nicotine sulphate: Source is tobacco.
  • Pyrethrum: Source is chrysanthemum.
  • Rotenone: Source is derris plant.

Explanation 17

Endosulfan is off patent insecticide. DDT is banned in India.

Explanation 18

Due to its highly toxic nature, it has been banned in mid-2012 in more than 80 countries. Endosulfan is banned in India.

Explanation 19

In agriculture in India , chlorpyriphos is one of the most widely used organophosphate.