CBSE Class 12 Biology Chapter 9 Strategies For Enhancement In Food Production Notes

One of the major concerns in recent times has been the issue of population explosion which in turn has necessitated the enhancement of food production. For this reason, different biological techniques and principles are being developed.

These techniques are applied to animal husbandry and plant breeding which has a major role in our efforts to increase food production. Some new techniques such as embryo transfer and the tissue culture techniques are ought to play a vital role in enhancing the food production furthermore. Explore more through strategies of enhancement in food production notes provided here.

Topics Covered in Chapter 9 Strategies For Enhancement In Food Production

Animal Husbandry

Plant Breeding

Single Cell Proteins

Tissue Culture

Animal Husbandry

It is the agricultural practice of breeding and raising livestock. It deals with the care and breeding of livestock such as cows, horses, cattle, sheep, camel etc that are useful to humans as they provide milk, eggs, honey, silk, meat, fibre etc. It also includes fisheries and poultry farming. The management of farms and farm animals involves the following procedures:

  • Dairy farm management – it is the management of animals for milk and its products
  • Poultry farm management – Poultry is the class of domesticated birds used for food or for their eggs which typically includes ducks and chicken
  • Animal breeding –¬†Breeding between animals of the same breed is referred to as inbreeding whereas crossing between different breeds is known as outbreeding. The process of inbreeding causes a rise in the homozygosity hence it is essential to evolve a pure line in any animal. Some other aspects of animal breeding are – outbreeding, out-crossing, cross-breeding, interspecific hybridization. In order to improve the herd, some programmes are also adapted such as – Multiple Ovulation Embryo Transfer Technology(MOET).
  • Bee-keeping or apiculture – it is the maintenance of hives of honeybees for the production of honey.
  • Fisheries – it deals with catching, processing or selling fish, shellfish or other aquatic animals

See More: Important Questions for Class 12 Chapter 9: Strategies for Enhancement in Food Production

Plant Breeding

It is a technology that has helped increase yields to a large extent. Green revolution was dependant to a large extent on plant breeding techniques for the development of high-yielding and disease-resistant varieties in rice, wheat, maize etc. Plant breeding is the purposeful manipulation of plant species in order to create desired plant types that are better suited for cultivation, give better yields and are disease resistant.

Listed below are the steps in breeding a new genetic variety of a crop:

  • Collection of variability
  • Evaluation and selection of parents
  • Cross hybridization among the selected parents
  • Selection and testing of superior recombinants
  • Testing, release and commercialization of new cultivators

The most common methods of plant breeding are listed below:

  • Hybridization
  • Tissue culture
  • Biofortification
  • Mutation breeding
  • Somatic hybridization
  • Plant breeding for improved food quality and developing resistance to insect and pests

Plant Breeding For Diseases Resistance

The resistance of the host plant is the capability to prevent the pathogens from causing any disease. This is determined by the genetic composition of the host. Plant breeding and development in cases of crop losses helps enhance the production of food. It can also help to reduce the dependence on the use of bacteriocides and fungicides. Tobacco mosaic and turnip mosaic by viruses are examples.

Some of the methods of breeding for disease resistance conventionally are selection and hybridization whereas different sequential steps are – screening germplasm(resistance sources), hybridization(selected parents), evaluation and selection of hybrids, the release of new varieties after testing.

Single Cell Protein

Single cell protein(SCP) is one of the alternate sources of proteins for animals and human nutrition. Microbes are cultivated on an industrial scale as a source of good protein. Spirulina(blue-green algae) can be grown on materials like wastewater from potato processing plants, molasses, straw, sewage to produce large quantities and can serve as food rich in protein, fats, minerals etc. This also helps to reduce environmental pollution.

Tissue Culture

In tissue culture, any plant part can be taken out and cultivated in a test tube in sterile conditions in a special nutrient media(providing a carbon source such as sucrose and also inorganic salts, vitamins, amino acids and growth regulators). This process of generating a whole plant from any cell/plant is called totipotency. The method of producing thousands of plants through tissue culture is called micropropagation and these plants are genetically identical to the original plant from which they are grown.

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