NCERT Solutions for Class 9 Science Chapter 15
Important NCERT Questions
Improvements in Food Resources
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-204
Questions No-2
What are the desirable agronomic characteristics for crop improvements?
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The desirable agronomic characteristics for crop improvements are:
(i) Tallness and profuse branching in any fodder crop.
(ii) Dwarfness in cereals. These desirable agronomic characteristic help in increasing crop productivity.
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If we develop those varieties of- crops which contain desired agronomic traits (e.g., high yield, dwarfness, early maturing, etc.) then it will help in setting higher production, Thus, tallness and profuse branching are desirable characters for fodder crops. Dwarfness is desired in cereals, so that less nutrient, are consumed by these crops. Dwarf varieties of cereals also provide protection from lodging.
Desirable agronomic characteristics for crop improvements are traits that contribute to the overall productivity, resilience, and sustainability of crops. These characteristics can vary depending on the specific crop and the environmental conditions in which it is grown. Here are some key agronomic characteristics that are often targeted for improvement:
1 Yield Potential:
Desired Trait: High-yielding crops that produce more harvestable biomass or grain.
Importance: Increased yield is essential for meeting global food demands and improving food security.
2 Disease Resistance:
Desired Trait: Resistance to common pests, pathogens, and diseases.
Importance: Disease-resistant crops reduce the need for chemical inputs and contribute to more sustainable and environmentally friendly agriculture.
3 Pest Resistance:
Desired Trait: Resistance to insect pests, nematodes, and other herbivores.
Importance: Pest-resistant crops can reduce the need for pesticides and minimize crop losses due to insect damage.
4 Drought Tolerance:
Desired Trait: Ability to withstand periods of water scarcity and maintain productivity.
Importance: Drought-tolerant crops are crucial for adapting to changing climate conditions and ensuring stable yields in water-limited environments.
5 Heat Tolerance:
Desired Trait: Ability to withstand high temperatures and heat stress.
Importance: With the increasing frequency of heatwaves, crops that can tolerate elevated temperatures are essential for maintaining productivity.
6 Nutrient Use Efficiency:
Desired Trait: Efficient use of nutrients, including nitrogen, phosphorus, and potassium.
Importance: Improving nutrient use efficiency minimizes environmental impact and reduces the cost of fertilizers.
7 Adaptability to Varied Environments:
Desired Trait: Wide adaptability to different soil types, climates, and agro-ecological zones.
Importance: Crops that can thrive in diverse conditions provide flexibility to farmers and enhance food security.
8 Uniform Maturity:
Desired Trait: Simultaneous or uniform maturation of crops for easier harvesting.
Importance: Uniform maturity facilitates efficient and cost-effective harvesting.
9 Resilience to Abiotic Stresses:
Desired Trait: Tolerance to abiotic stresses such as salinity, flooding, and soil acidity.
Importance: Crops that can withstand adverse environmental conditions contribute to overall farm resilience.
10 Shelf Life and Post-Harvest Quality:
Desired Trait: Longer shelf life, improved post-harvest quality, and reduced susceptibility to spoilage.
Importance: Enhanced post-harvest characteristics contribute to reduced food waste and better marketability.
Advancements in biotechnology, breeding techniques, and genetic engineering are often employed to develop crops with these desirable agronomic characteristics. It’s important to balance these improvements with considerations for environmental sustainability, ethical concerns, and the nutritional needs of the human population.