These are the CBSE class 9 biology notes on chapter Improvement in food resources Topics covered in this page are
For their existence, all living organisms essentially require the food. Food is required to perform various life activities. It is required for growth, development and body repair.
The two major sources of food are the plants and the animals.
With the increase in human population there is a growing demand for food resources. It is necessary to increase production of both, plant and animals. Earlier also to meet the demand of Indian population our scientists put efforts to increase food production. This resulted in a variety of ‘revolutions’ which made India self-reliant.
These revolutions include green revolution (bumper production of food grains), blue revolution (enhanced fish production), white revolution (increased milk production) and yellow revolution (increased oil production). But it is important that we should increase in food production without degrading our environment and disturbing the natural balance (soil erosion, silting of rivers, floods, droughts, ozone depletion etc).
Hence, the need is develop an agricultural system that aims to meet the needs of present generation without endangering the resources of future generation and without causing degradation in the present environment.
Currently, there is a need of adoption of technique sustainable agriculture and organic farming.
Sustainability means keeping an effort going continuously. So, sustainable agriculture means successful management of resources for agriculture to satisfy the changing human needs, while maintaining or enhancing the quality of environment and conserving natural resources.
Sustainable agriculture can be achieved by adopting;
Advantages of Sustainable agriculture:
It is practice of raising unpolluted crops through the use of manures, biofertilizers and biopesticides with healthy cropping systems that provide optimum nutrients to plants and keep the pests as well as weeds under control.
In organic farming:
Organic farming methods are studied in the field of agro ecology.