denuded areas on which ccologic Succession is initiated, e.g., 

 Erosion, Deposition. 



Innate Releasing Mechanism 



A device (postulated) in the nervous system which 

 initiates a certain reaction when an animal receives a par- 

 ticular stimulus. 



Inoculate 



To introduce a microorganism, virus, serum, etc., into 

 an organism. 



Insecticide 



A material used for destroying insects, e.g., DDT, rote- 

 none. cf. Herbicide, Fungicide. 



Insectivore 



An animal in the order Insectivora, a primitive Insecti- 

 vorous group in the class Mammalia, e.g., mole, shrew. 



Insectivorous 



Refers to an organism that eats insects. 



Insect Vector 



An insect by which a disease-producing organism or a 

 parasite is disseminated, e.g., aphids and leafhoppers trans- 

 mitting plant diseases. 



Insolation 



Solar radiation received by the earth or other planets 

 from the sun, or exposure to rays of the sun. 



Instar 



A form in the larval development of insects between 

 two moults. 



Instinct 



An inherited and adapted system of co-ordination within 

 the nervous system as a whole, which when activated finds 

 expression in behaviour culminating in a fixed action pattern. 



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