Q1
Fertilisers help crops mainly by:
Aproviding essential nutrients
Bproviding water only
Cremoving pests
Dchanging crop colour
CBSEClass 9 (CBSE)ScienceCh 12 · Topic 1
Improving Crop Yields
Learning methods used to increase agricultural crop production.
Core concept
High-yielding varieties (HYVs), central to the Green Revolution in India during the 1960s-70s, are bred to produce more grain, resist certain diseases, or mature faster than traditional varieties, dramatically increasing India's food production. However, HYVs often require more water and fertiliser than traditional varieties, meaning proper irrigation and nutrient management are essential companions to seed improvement, and modern approaches also emphasise sustainable farming to avoid soil degradation from overuse of chemical fertilisers.
Exam highlight
Key diagram
Keywords worth remembering
Trending
improving crop yieldscbse class 9
Most searched
CBSE class 9 improving crop yields
Quick revision
Study resources
Notes & downloads
Quick notes
• Crop yield improvement methods: HYV seeds, proper irrigation, fertilisers/manure, pest and weed management.
• HYV seeds were central to India's Green Revolution (1960s-70s), boosting food production.
• HYVs often require more water and fertiliser than traditional crop varieties.
• Sustainable farming practices help avoid soil degradation from overuse of chemical fertilisers.