a) Insects which occur on a crop almost throughout the year are i) Occasional pests ii) Seasonal pests iii) Persistent pests iv) Sporadic pest b) Study of insects which are various... a) Insects which occur on a crop almost throughout the year are i) Occasional pests ii) Seasonal pests iii) Persistent pests iv) Sporadic pest b) Study of insects which are variously related to the welfare of mankind is referred i) Insect toxicology ii) Insect Physiology iii) Economic entomology iv) Medical entomology c) The Insecticide act passed during the year i) 1972 ii) 1968 iii) 1989 iv) 2010 d) Alternate wetting and drying of rice field is a cultural method of control adopted for i) Rice stem borer ii) Rice leaf folder iii) Brown plant hopper iv) Rice Gundhi bug e) The most commonly used commercial insect virus against lepidopteran pests is i) NPV ii) CPV iii) GV iv) Polydna virus f) Best method to control entry of foreign pests into the country is i) Biological method ii) Legal method iii) Chemical method iv) Physical method g) Crop rotation is a __________ method of control i) Mechanical ii) Cultural iii) Physical iv) None h) Chemical substances which elicit oriented movement of insects towards their sources are i) Repellents ii) Chemosterillants iii) Attractants iv) Antifeedents i) Zygogramma bicolorata is used as a biocontrol agent of i) Salvinia molesta ii) Eichornia crassipes iii) Parthenium hysterophorus iv) Chromolaena odorata j) Cryptolaemus montrouzieri is a i) Predator ii) Pathogen iii) Parasite iv) Pest Q. II. State the following statements are true or false. Read more