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CBSE Guide Improvement in Food Resources class 9 Notes

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9 Science notes Chapter 15 Improvement in Food Resources

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CBSE Class 9 Science
Revision Notes
CHAPTER – 15
Improvement in food resources

1. Food Resources: Cereals (Wheat, rice, maize, millets and sorghum) provide us carbohydrates; Pulses (Grams, pea and lentil) provide us proteins; Oil seeds (Soya bean, ground nut, sesame, and castor) provide us fats; Vegetables, spices and fruits provide us a range of minerals, nucleic acids and vitamins.

In addition to these food crops, fodder crops like berseem, oats or sudan grass are raised as food for the livestock are called as fodder crops.

2. The Kharif crops: The crops grown in rainy season are called as Kharif crops (Paddy, Soya bean, pigeon pea and maize). They are grown from June to October.

3. The Rabi crops: The crops grown in winter season are called Rabi crops (Wheat, gram, peas, and mustard). They are grown November to April.

Compare Kharif crops and Rabi crops:

SN	Crop	Season	Example
1.	Kharif crops	June to October ( Rainy Season)	Paddy, Soya bean, and maize
2.	Rabi crops	Nov. to April ( winter season)	Wheat, gram, peas, and mustard

4. The Green Revolution: Food supplies are generally as proteins, carbohydrates, fats, minerals, nucleic acids and vitamins in all living organisms. Indian population is growing enormously. Green Revolution is the need of the hour to increase food-grain production.

5. Sustainable Practices: For sustained livelihood, one should undertake mixed farming, inter cropping, and integrated farming practices, for example, combining agriculture with livestock/ poultry/ fisheries/bee-keeping. The major group of activities for improving crop yield can be classified as: Crop varietal improvement, Crop production improvement, Crop protection improvement

6. The Crop varietal improvement:

a) Hybridization: It refers to crossing between genetically dissimilar plants;It is all to get higher yield, improved quality, biotic and abiotic resistance, change in maturity duration, wider adaptability and desirable agronomic characteristics.

SN	Type	Context
1	Inter varietal Hybridization	between different varieties
2	Inter specific Hybridization	between different species
3	Inter generic Hybridization	between different genera
4	Genetically Modified Crops (GMC).	Another way of improving the crop is by introducing a gene that would provide desired characteristic.

7. The Crop production improvement: They include” no cost production”,” low cost production” or “high cost production” practices.

1. Nutrients (Sixteen elements are required for growth are called as essential elements Carbon, oxygen, hydrogen+ Macro nutrients & Micronutrients. They increase the yield)

SNo.	Macro nutrient	Micro nutrient
1.	Six elements are required in larger quantity	Other seven elements are required in small quantity
2.	Ex.Nitrogen, phosphorus, calcium, Potassium, magnesium, sulphur	Ex. Iron, manganese, boron, zink, copper, molybdinum, chlorine

1. Manure & Fertilizers:

SNo.	Manure	Fertilizers
1	Manure is prepared by the decomposition of animal excreta and plant waste is called as Humus. It decides the texture of the soil. Compost: Farm waste, cow dung etc. Vermi compost: Compost prepared by using earthworms.	Fertilizers are commercially produced plant nutrients. Excess fertilizers destroy the soil fertility. Organic farming: No use of chemicals fertilizers, herbicides, pesticides etc. Culturing blue green algae, neem leaves, healthy cropping systems.
2	It is cheap and prepared in rural homes and fields	It is costly and is prepared in factories
3	It is voluminous and bulky	It is compact and concentrated
4	It is inconvenient to store, transport, handle.	It is easy to store, transport, handle.
5	It is not nutrient specific.	It is nutrient specific and can provide specifically nitrogen, phosphorus etc.
6	Add great humus to the soil	Does not add humus to the soil.

3. Irrigation: India has variety of water resources: Wells, canals, river lift system, tanks, rainwater harvesting, water shedding management to increase in ground water levels and to check the water flowing away to the sea. Planning to reduce soil erosion.

4. Cropping patterns:

S N.	Mixed cropping	Inter-cropping	Crop rotation
1	Two or more crops Grown simultaneously on the same piece of land	Two or more crops grown simultaneously on the same piece >of land in a definite pattern	Growing different crops on a piece of land in a pre-planned succession
2	Ex. Wheat+ Gram Wheat+ Mustard; Wheat+ gram; Groundnut+sunflower.	Soyabean + maize/bajra + Cowpea	Two or three crops can be grown in a year depending upon the duration.
3	A type of insurance against failure of one of the crops.	A few rows of one crop alternate with a few rows of a second crop. Crops are selected such that their nutrient requirements are different. This ensures the maximum utilization of the nutrients supplied and prevents pests and diseases spreading in the crop field	The availability of moisture and Irrigation facilities decides the choice of the crop to be cultivated.

8. Crop protection improvement/ management: Field crops are infested by large number of weeds, insects pests, diseases & storage of grains

SN.	Weeds	Insect pests	Diseases	Storage of grains
1	Weeds are unwanted plants in the crop field	Insect pest is nuisance in the crop field	Disease is caused by pathogens in the field	Different factors are responsible.
2	Weeds take up nutrients and reduce the growth	Insect pest affect the health of crop and reduce the yield.	Diseases alter the physiology of crops and reduce the yield	Different factors reduce the quality of stored grains
3	Ex. Xanthium, Parthenium	Ex. Caterpillars, dragonfly	Ex. Bacteria, Virus	Botic factors: insects, rodents, fungi Abiotic factors: moisture & temperature
4	Removal of weeds at an early stage is recommended. Spray weedicides	Spread of chemicals such as pesticides	Spread of chemicals to kill pathogens	Systematic management of ware house.

9. Animal Husbandry: It is a scientific management of animal livestock, includes feeding, breeding and diseases control. Animal-based farming includes cattle farming, Poultry farming, fish farming, and bee Keeping.

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