Quick Summary
Breeding improves useful traits in plants and animals. Biotechnology uses living systems to produce useful products and solve problems in agriculture, medicine, and industry.
Key Definitions
- Breeding: Producing improved organisms with desired traits.
- Hybridisation: Crossing two genetically different individuals.
- Selection: Choosing organisms with desirable characters.
- Biotechnology: Use of living organisms or biological processes for useful products.
- Genetic engineering: Direct modification of genetic material.
- Tissue culture: Growing plants from tissue in sterile nutrient medium.
Plant Breeding
Plant breeding aims to improve yield, disease resistance, quality, and adaptability. Selection and hybridisation are common methods.
Animal Breeding
Animal breeding improves milk yield, meat quality, disease resistance, and working ability. Controlled breeding helps preserve useful traits.
Biotechnology Applications
| Field | Application |
|---|---|
| Agriculture | Improved crops, tissue culture |
| Medicine | Vaccines, insulin production |
| Industry | Enzymes and fermentation products |
| Environment | Waste treatment and bioremediation |
Plant Breeding Methods (deeper)
Green Revolution in India used improved high-yielding, disease-resistant wheat and rice varieties.
Tissue Culture
Tissue culture can produce many identical plants quickly. It is useful for disease-free plants, rare plants, and commercial propagation.
Tissue Culture — steps
Because all plants come from one parent tissue, they are genetically identical clones (micropropagation).
Genetic Engineering — the idea
A desired gene is cut from one organism and inserted into another using enzymes, creating a genetically modified / recombinant organism. Examples: bacteria engineered to produce human insulin, and Bt crops with built-in pest resistance.
Textbook Solution Strategy
1. Separate breeding and biotechnology in long answers. 2. Use examples for plant and animal breeding. 3. For tissue culture, write sterile conditions and nutrient medium. 4. Mention both benefits and responsible use. 5. Use tables for application questions.
Important Questions
One Mark
- Define biotechnology.
- What is hybridisation?
- What is tissue culture?
Two Marks
- Write two aims of plant breeding.
- What are the benefits of animal breeding?
- Give two applications of biotechnology.
Five Marks
- Explain plant breeding methods and uses.
- Describe tissue culture and its importance.
- Explain applications of biotechnology in different fields.
Common Mistakes
- Treating breeding and biotechnology as the same term.
- Forgetting sterile conditions in tissue culture.
- Writing only agriculture applications for biotechnology.
- Missing examples in breeding answers.
Revision Checklist
- Breeding definitions revised
- Hybridisation and selection understood
- Tissue culture steps memorised
- Biotechnology applications listed
- Plant and animal breeding aims compared