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Published on: 09/09/2019
Botany - Plant Breeding
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Which one of the following crop varieties correct matches with its resistance to a disease?
| Variety | Resistance to disease |
| Pusa Komal | Bacterial blight |
| Variety | Resistance to disease |
| Pusa Sadabahar | White rust |
| Variety | Resistance to disease |
| Pusa Shubhra | Chilli mosaic virus |
| Variety | Resistance to disease |
| Brassica | Pusa swarnim |
2.
A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in ______.
iron
carbohydrates
proteins
vitamins
3.
Which one of the following are the species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems and 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
4.
Progeny obtained as a result of repeat self pollination a cross pollinated crop to called
pure line
pedigree line
inbreed line
heterosis
5.
6.
Plants having similar genotypes produced by plant breeding are called _____.
clone
haploid
autopolyploid
genome
7.
Desired improved variety of economically useful crops are raised by _______.
Natural Selection
hybridization
mutation
biofertilisers
8.
The quickest method of plant breeding is _______.
Introduction
Selection
Hybridization
Mutation breeding
9.
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 | ii | iii | iv |
| I | II | III | IV |
| i | ii | iii | iv |
| III | I | IV | II |
| i | ii | iii | iv |
| IV | II | I | IV |
| i | ii | iii | iv |
| II | IV | III | I |
10.
Pick out the odd pair
Mass selection - Morphological characters
Pureline selection - Repeated self pollination
Clonal selection - Sexually propagated
Natural selection - Involves nature
11.
Explain the best suited type followed by plant breeders at present?
12.
How are microbial inoculants used to increase the soil fertility?
13.
14.
List out the new breeding techniques involved in developing new traits in plant breeding.
15.
16.
1.
(a)
| Variety | Resistance to disease |
| Pusa Komal | Bacterial blight |
2.
(c)
proteins
3.
(a)
Saccharum robustum and Saccharum officinarum
4.
(a)
pure line
5.
(d)
6.
(a)
clone
7.
(b)
hybridization
8.
(d)
Mutation breeding
9.
(b)
| i | ii | iii | iv |
| III | I | IV | II |
10.
(c)
Clonal selection - Sexually propagated
11.
(i) Vegetative propagation is the best suited measure for maintaining hybrid vigour, since the desired characters are not lost and can persist over a Period of time.
(ii) Many breeders believe that its magnitude of heterosis is directly related to the degree of genetic diversity between the two parents.
12.
Micro organisms are efficient in fixing nitrogen, solubilizing phosphate and decomposing cellulose. They improve soil fertility, plant growth. They are ecofriendly and cost-effective than chemical fertilizers. Example. Azospirillum.
13.
14.
(i) Hybridization, Mutation breeding, Polyploid breeding, Breeding for developing resistance to diseases, Biofortification, Breeding for resistance to insect pests, New Breeding Techniques (NBT) such as.
(ii) CRISPR/ Cas (Cutting and modifying the genome during the repair process by tool).
(iii) ODM: Oligonucleotide - directed mutagenesis
(iv) Transferring a gene from an identical or closely related species (Cisgenesis).
(v) Organising processes that alter gene activity without altering the DNA itself (Epigenetic methods).
15.
16.
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History
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Biology
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Computer Science
Business Maths and Statistics
Commerce
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Maths
Chemistry
Physics
Computer Technology
History
Accountancy
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