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Crop Improvement / Plant Breeding

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Crop Improvement / Plant Breeding — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Crop Improvement / Plant Breeding covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Crop Improvement / Plant Breeding — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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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