How will you improve the resources of food and why do improvement in food resources is important for us
Answers
Facts that Matter
• Food supplies proteins, carbohydrates, fats, vitamins and minerals, all of which we require for body development, growth and health.
• Different crops require different climatic conditions, temperature and photoperiods for their growth and completion of their life cycle. Photoperiods are related to the duration of sunlight. Growth of plants and flowers are dependent on sunlight.
• Successful crop production depends upon many factors such as: (i) Understanding how crops grow and develop. (ii) Effect of various nutrients, climate, water on the growth of the plant. (iii) Modification and management of each factor for increasing the yield of the crop.
• The crops which are grown in rainy season (the kharif season, from June to October) are called as kharif crops. Example: Paddy, soyabean, pigeon pea, maize, cotton, green gram and black gram are kharif crops.
• The crops which are grown in winter season (the rabi season, from November to April) are called rabi crops. Example: Wheat grain, peas, mustard and linseed are rabi crops.
• Crop variety improvement: It can be done either by hybridisation or by introducing a gene. (i) Crop improvement by hybridisation: Hybridisation refers to crossing between genetically dissimilar plants. This crossing may be intervarietal (between different varieties), interspecific (between two different species of the same genus) or intergeneric (between different genera). (ii) Crop improvement by introducing a gene: This provides the desired characteristics and results in genetically modified crops.
• Cultivation practices and crop yield are related to weather, soil quality and availability of water. Since weather conditions such as drought and flood situations are unpredictable, varieties that can be grown in diverse climatic conditions are useful.
• The factors for which variety improvement is done are: (i) Higher yield: To increase productivity of the crop per acre. (ii) Improved quality: The quality of crop products vary from crop to crop. E.g., protein quality is important in pulses, oil quality in oilseeds, preserving quality in fruits and vegetables. (iii) Biotic and abiotic resistance: Biotic factors are the diseases, insects and nematodes while abiotic factors are the drought, salinity, water logging, heat, cold and frost which affect the crop productivity. Varieties resistant to these factors (stresses) can be improved to increase crop production. (iv) Change in maturity duration: Shorter maturity period of crop reduces the cost of crop production and makes the variety economical. Uniform maturity makes the harvesting process easy and reduces losses during harvesting. (v) Wider adaptability: It allows the crops to be grown under different climatic conditions in different areas. (vi) Desirable agronomic characteristics: It increases productivity, for example, tallness and profuse branching are desirable characters for fodder crops; while dwarfness is desired in cereals, so that less nutrients are consumed by these crops.
• Plant nutrients: Nutrients are supplied to plants by air, water and soil. There are sixteen nutrients which are essential for plants. Air supplies carbon and oxygen; hydrogen comes from water and soil supplies the other thirteen nutrients to plants. Amongst these thirteen nutrients, six are required in large quantities and are therefore called macro-nutrients. The other seven nutrients are used by plants in small quantities and are therefore called micro
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Your Answer is : To achieve high productivity , we should develop plant varieties with desirable agronomic traits . The desirable agronomic characters for crop improvement are :
- The food Crops Should be dwarf , so that they consume less nutrients and become more stronger as well as withstand strong winds.
- The fodder crops should be tall and have profuse branching.
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