Fundamentals of Agrochemistry — DU B.Sc. (Prog.) Applied Life Sciences with Agrochemicals and Pest Management pertaining to Chemistry Previous Year Question Papers

6. Discuss the following type of formulations in brief: (Any five) (a) Suspension Concentrate (d) Wettable powders (g) Poison baits Nane of the Paper Nane of the Course AGROCHEMICAI AND PEST MANAGEMENT Elm-e:2Hours 1. (a) Explain herbicides with suitable examples. (b) Write a short note on fungicides. 3 (c) What are chemosterilants? Explain their 3 role in pest control. (d) Write a short note on molluscicides. 3 (e) Write a brief account of plant growth 3 regulators as pesticides. 2. (a) Discuss the structure, mode of action and uses of the following: (Any three) (b) Aryl alkanoic acids: 2, 4-D (c) Uracils: Bromacil (e) Dinitro phenols: 2, 4-Dinitro 3. (a) What are rodenticids? Comment how aluminium phosphide acts as a rodenticide? (b) What do you mean by LDso Explain. 3 kg respectively. Arrange them in decreasing order of toxicity giving suitable 4. Draw the structure of any three of the follow-ing pesticides. Give the chemical class to which these belong and indicate the main functional group present: 5+5+5=15 (ill) Parathion 5. What happen when? (a) Cantact herbicides are used as foliar spray. (b) Paraquat type herbicides are used in soil. (c) Glyphosate used in soil containing heavy metals. 3 (d) Chlorosulfuron is used in soil with low pH.