Hybridisation and Mutation Breeding - Unsolved Practice Set
Chapter: Strategies for Enhancement in Food Production | Topic: Hybridisation and Mutation Breeding
HYBRIDISATION AND MUTATION BREEDING - UNSOLVED PRACTICE SET
Topic: Hybridisation and Mutation Breeding
Multiple Choice Questions
Q1. Hybridisation in plant breeding refers to:
- Exposing seeds to radiation
- Crossing two genetically dissimilar plants to combine desirable traits
- Growing plants in tissue culture
- Adding vitamins to seeds
Q2. Crossing two different varieties of the same species is known as:
- Interspecific hybridisation
- Intervarietal (intraspecific) hybridisation
- Intergeneric hybridisation
- Mutation breeding
Q3. Mutation breeding involves the use of:
- Only cross-pollination between varieties
- Physical or chemical mutagens to induce genetic variation
- Only tissue culture techniques
- Grafting methods
Q4. Which of the following is commonly used as a physical mutagen in mutation breeding?
- Gamma radiation
- Colchicine
- EMS (ethyl methanesulfonate)
- Fertiliser
Q5. A key advantage of mutation breeding is that it can:
- Only reduce genetic variation
- Introduce new, useful genetic variations that may not exist naturally in a species
- Replace the need for any selection process
- Guarantee 100% success in every attempt
Short Answer Questions
Q6. Differentiate between intervarietal and interspecific hybridisation.
Q7. What is mutation breeding, and what role do mutagens play in this process?
Q8. Name any two physical or chemical mutagens used in mutation breeding.
Q9. Give one advantage of using hybridisation as a plant breeding technique.
Long Answer Questions
Q10. Explain hybridisation as a plant breeding technique, describing its different types and how it helps combine desirable traits from two parent plants.
Q11. Discuss mutation breeding, explaining how mutagens are used to create genetic variation and how useful mutants are identified and selected for crop improvement.
APPLICATION / ANALYSIS
Q12. A plant breeder wants to combine the high yield of one wheat variety with the disease resistance of another closely related wheat variety. Suggest which breeding technique (hybridisation or mutation breeding) would be more suitable for this specific goal, and explain your reasoning.
Q13. A research team exposes a batch of seeds to controlled doses of gamma radiation, hoping to produce a new crop variety with a desirable trait not found in the existing gene pool. Explain, using your understanding of mutation breeding, why this approach might succeed where simple hybridisation would not.