Agrochemicals & Pest Management — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

Pest Management 2. Attempt five questions in all. 1. (a) Define the following : (6) (ii) Perennial pests (ili) Fumigation (b) Differentiate between the following : (10) (i) Hypognathous head and opisthognathous head (ii) Diptera and Hemiptera (iii) Stomach poison and contact poison (iv) Parasite and parasitoid (v) Naiad and nymph (i) Khapra beetle (ii) Sand fly (iv) Wood termite (v) Human louse (d) Match the following : (4) (iv) Cypermethrin (d) Carbamate (e) Give the scientific names of following insects: (5) (i) Rice bug (ii) Lemon butterfly (iii) Red pumpkin beetle (iv) Spotted boll worm 2. (a) Define pest surveillance. What are the basic components of pest surveillance? (5) (b) Determination of Economic threshold level is a pre-requisite to the development of any pest management strategy. Justify the statement with example. (5) (c) How can agro-ecosystem be planned to reduce pest population? (5) 3. (a) Enumerate the different types of leg modifications in insects with the help of suitable examples and diagrams. (9) (b) Provide a detailed account on biting and chewing type of mouth parts of insects. (6) (a) Define IPM. Describe principal strategies and tactics of it. Discuss its holistic approach. (10) (b) What are the major constraints in the implementation and success of IPM? (5) (a) Enlist mechanical methods of pest control. Discuss these methods with suitable examples. (9) (b) Discuss merits and constraints in adaptation of biological control. (6) (a) Explain the bionomics of American cockroach, Periplaneta americana. Discuss different approaches for prevention and control of cockroach infestation. (b) Discuss the pest status and damages caused by Callosobruchus chinensis. Add note on its control measures. (6) 7. Write short notes on any three of the following : (1) Types of antennae in insects. (ii) Role of insects in the ecosystem. (iii) Bionomics of rat flea. (iv) Insect metamorphosis.