The principal characteristics are: 1. Reservoir of Genetic Information. 2. Inherited along with coded information through generations. 3. Metabolic activities of the organisms are performed by translating its code. 4. Highly stable.
Mutation is a change in the nucleotide sequence of genetic materials whether by substitution, duplication, insertion, deletion, or inversion. Mutations provide genetic variations which are the raw materials of evolution. Mutations are of two type: 1. Spontaneous mutation: Usual mutation under natural conditions. 2. Induced mutation: Artificially induced mutation by mutagens.
Repeated cultivation of the same crop like paddy results in a huge food reserve to a given pest, which encourages a rapid growth of the pest population. Any change in the crop would create a deficit in its food supply which results in a considerable mortality. Sometime a given pest population may be wiped out [...]
Systemic Insecticide: Insecticides that get into the body with food and affect different systems. e.g., Lead Arsenate, NaF. Contact Insecticide: Insecticides that kill the insect on contact through toxic effects. e.g., BHC, DDT, Aldrin.
Insecticide: Chemical agents used for destroying insects. eg. DDT. Pesticide: Chemicals meant for destruction of pests of any kind. e.g., Endrine, Drimecron etc. Fumigation: The method of pests control through fume of some specific pesticides. Fumigants. e.g., Methyl Bromide.
