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Revision Notes
Crop Improvement / Plant Breeding — Revision Notes
Telangana Open School (TOSS) · Class 12 · Biology
Crop Improvement / Plant Breeding revision notes for Telangana Open School (TOSS) Class 12 Biology: 4 topics in quick points.
44 questions30 flashcards4 concepts
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Key Topics to Revise
1
Objectives of Plant Breeding
- To develop crop varieties with desirable traits such as high yield, good quality, disease resistance, and drought tolerance.
- To create useful genetic variations through recombination of characters.
- To exploit hybrid vigour (heterosis) in crop plants.
2
Methods of Plant Breeding
- There are five main methods: Introduction, Selection, Hybridization, Mutation Breeding, and Polyploidy Breeding.
- Each method is chosen based on the plant's reproductive system and desired outcome.
3
Selection Methods
- Selection is the oldest method of plant breeding.
- Three types: Mass Selection, Pure Line Selection, and Clonal Selection.
- Mass selection is used for cross-pollinated crops; pure line for self-pollinated; clonal for vegetatively propagated plants.
4
Hybridization
- Involves crossing two genetically different parents to produce superior offspring.
- Steps: Selection of parents, emasculation, bagging, artificial pollination.
- Results in hybrid vigour or heterosis — F₁ hybrids outperform parents.
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Full NotesKey Concepts
Plant breeding is the applicationHybridization involves crossing two genetically differentMutation breeding uses physical or chemicalPolyploidy breeding involves increasing the number
Frequently Asked Questions
What are the important topics in Crop Improvement / Plant Breeding for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Crop Improvement / Plant Breeding include Objectives of Plant Breeding, Methods of Plant Breeding, Selection Methods, Hybridization. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Crop Improvement / Plant Breeding for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Crop Improvement / Plant Breeding. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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