Modification and adjustment of an organism to local environment is called acclimatization. The newly developed varieties of crops are acclimatized in different environmental condition before releasing to farmers for raising crops.

Plant hybridization is also done to increase in nutritive value of crop plants. Wheat variety Atlas 66 has high protein value that is used as donor for high protein variety.

Disease free plants can be obtained by the tissue culture of meristematic tissues present at shoot tips. The newly formed cells are generally disease free and plants obtained from this are also disease free.

The consequences of plant disease are reduced yield, lower quality of produce, increased cost of production and sometimes poisonous produce. It do not produce variation in the genome.

Gene banks comprise Seed banks, orchards, tissue culture and cryopreservation. Genomes of different plants are preserved for used in genetic program like plant breeding.

Mushrooms are eaten by many people and large scale mushroom culture is a growing industry. It is a rich source of protein and other micronutrients.

Anther can yield a completely haploid plant because anther is produced by meiosis cell division contain half the number of chromosome their normal cells have.

Procedure between formation of plantlets in culture and establishment of seedlings in the field is called hardening. Hardening is induced by keeping plantlets under low light intensity and high humidity.

Single cell protein (SCP) is biomass got from microorganisms. Single cell proteins are alternate source of protein in much concentrated form.

Multiple shoots are produced in meristem culture because culture media contains cytokines for overcoming apical dominance.

Out-breeding is the breeding of the unrelated animal which may be of same breed without common ancestors or cross breeding or inter-specific hybridization.

Heavy mortality of fishes within a few days in lake is due to spraying of DDT on large scale. Excessive water and heavy rain as well as change in temperature do not cause large scale death of fishes in a lake.

Honey is the food of high nutritive value and finds use in Indigenous system of medicine. Beeswax is used in preparation of cosmetic and polishes.

Fisheries has important place in Indian economy. It provides income and employment to millions of farmers and fishermen particularly in coastal states. It is an only source of income for many persons living near coastal areas.

All the individuals related by common descent and having a similar genotype constitute a line. Pure line is obtained by successive breeding.