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Chapters
2: Classical Genetics
3: Chromosomal Basis of Inheritance
4: Principles and Processes of Biotechnology
5: Plant Tissue Culture
6: Principles of Ecology
7: Ecosystem
8: Environmental Issues
▶ 9: Plant Breeding
10: Economically Useful Plants and Entrepreneurial Botany
![Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 9 - Plant Breeding - Shaalaa.com](/images/biology-botany-english-class-12-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 9 - Plant Breeding")
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Solutions for Chapter 9: Plant Breeding
Below listed, you can find solutions for Chapter 9 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Biology (Botany) [English] Class 12 TN Board.
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board 9 Plant Breeding Evaluation [Pages 181 - 182]
Assertion: Genetic variation provides the raw material for selection
Reason: Genetic variations are differences in genotypes of individuals.
Assertion is right and reason is wrong.
Assertion is wrong and reason is right.
Both reason and assertion is right.
Both reason and assertion is wrong.
While studying the history of the domestication of various cultivated plants _______ were recognized earlier.
Centres of origin
Centres of domestication
Centres of hybrid
Centres of variation
Pick out the odd pair.
Mass selection - Morphological characters
Purline selection - Repeated self pollination
Clonal selection - Sexually propagated
Natural selection - Involves nature
Match Column I with Column II
| Column I | Column II | ||
| i) | William S. Gaud | I) | Heterosis |
| ii) | Shull | II) | Mutation breeding |
| iii) | Cotton Mather | III) | Green revolution |
| iv) | Muller and Stadler | IV) | Natural hybridization |
i – I, ii – II, iii – III, iv – IV
i – III, ii – I, iii – IV, iv – II
i – IV, ii – II, iii – I, iv – IV
i – II, ii – IV, iii – III, iv – I
The quickest method of plant breeding is
Introduction
Selection
Hybridization
Mutation breeding
Desired improved variety of economically useful crops are raised by
Natural Selection
hybridization
mutation
biofertilisers
Plants having similar genotypes produced by plant breeding are called
clone
haploid
autopolyploid
genome
Importing better varieties and plants from outside and acclimatizing them to the local environment is called
cloning
heterosis
selection
introduction
Dwarfing gene of wheat is
pal 1
Atomita 1
Norin 10
pelita 2
Crosses between the plants of the same variety are called
interspecific
inter varietal
intra varietal
inter generic
Progeny obtained as a result of repeat self-pollination a cross-pollinated crop to called
pure line
pedigree line
inbreed line
heterosis
Jaya and Ratna are the semi dwarf varieties of
wheat
rice
cowpea
mustard
Which one of the following are the species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems, and the ability to grow in the sugarcane belt of North India?
Saccharum robustum and Saccharum officinarum
Saccharum barberi and Saccharum officinarum
Saccharum sinense and Saccharum officinarum
Saccharum barberi and Saccharum robustum
Match column I (crop) with column II (Corresponding disease-resistant variety) and select the correct option from the given codes.
| Column I | Column II | ||
| I) | Cowpea | i) | Himgiri |
| II) | Wheat | ii) | Pusa Komal |
| III) | Chilli | iii) | Pusa Sadabahar |
| IV) | Brassica | iv) | Pusa Swarnim |
I - iv, II - iii, III - ii, IV - i
I - ii, II - i, III - iii, IV - iv
I - ii, II - iv, III - i, IV - iii
I - i, II - iii, III - iv, IV - ii
A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in
iron
carbohydrates
proteins
vitamins
Which one of the following crop varieties correct matches with its resistance to disease?
| Variety | Resistance to disease |
| a) Pusa Komal | Bacterial blight |
| b) Pusa Sadabahar | White rust |
| c) Pusa Shubhra | Chilli mosaic virus |
| d) Brassica | Pusa swarnim |
Which of the following is incorrectly paired?
Wheat - Himgiri
Milch breed - Sahiwal
Rice - Ratna
Pusa Komal - Brassica
Match List I with List II
| List I | List II | ||
| Biofertilizer | Organisms | ||
| i) | Free-living N2 | a) | Aspergillus |
| ii) | Symbiotic N2 | b) | Amanita |
| iii) | P Solubilizing | c) | Anabaena azollae |
| iv) | P Mobilizing | d) | Azotobactor |
i - c, ii - a, iii - b, iv - d
i - d, ii - c, iii - a, iv - b
i - a, ii - c, iii - b, iv - d
i - b, ii - a, iii - d, iv - c
Differentiate primary introduction from secondary introduction.
How are microbial innoculants used to increase soil fertility?
What are the different types of hybridization?
Explain the best-suited type followed by plant breeders at present?
Write a note on heterosis.
List out the new breeding techniques involved in developing new traits in plant breeding.
Solutions for 9: Plant Breeding
Samacheer Kalvi solutions for Biology (Botany) [English] Class 12 TN Board chapter 9 - Plant Breeding
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Concepts covered in Biology (Botany) [English] Class 12 TN Board chapter 9 Plant Breeding are Origin of Agriculture, History of Agriculture, Organic Agriculture, Conventional Plant Breeding Methods, Modern Plant Breeding, Relationship Between Humans and Plants, Domestication of Plants, Plant Breeding.
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