Plus One / 12th Botany - Book Back Answers - Chapter 9 - English Medium
Tamil Nadu Board 12th Standard Botany - Chapter 9: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 9 – Botany from the Tamil Nadu State Board 12th Standard Botany textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Botany Chapter 9 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
Unit 9 - Plant Breeding
I. Multiple Choice Questions
1. Assertion: Genetic variation provides the raw material for selection
Reason: Genetic variations are differences in genotypes of the individuals.
a) Assertion is right and reason is wrong.
b) Assertion is wrong and reason is right.
c) Both reason and assertion is right.
d) Both reason and assertion is wrong.
Answer Key:
b) Assertion is wrong and reason is right.
2. While studying the history of domestication of various cultivated plants _______ were recognized earlier
a) Centres of origin
b) Centres of domestication
c) Centres of hybrid
d) Centres of variation
Answer Key:
a) Centres of origin
3. Pick out the odd pair.
a) Mass selection - Morphological characters
b) Purline selection - Repeated self pollination
c) Clonal selection - Sexually propagated
d) Natural selection - Involves nature
Answer Key:
c) Clonal selection - Sexually propagated
4. 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
a) i – I, ii – II, iii – III, iv – IV
b) i – III, ii – I, iii – IV, iv – II
c) i – IV, ii – II, iii – I, iv – IV
d) i – II, ii – IV, iii – III, iv – I
Answer Key:
b) i – III, ii – I, iii – IV, iv – II
5. The quickest method of plant breeding is
a) Introduction
b) Selection
c) Hybridization
d) Mutation breeding
Answer Key:
d) Mutation breeding
6. Desired improved variety of economically useful crops are raised by
a) Natural Selection
b) hybridization
c) mutation
d) biofertilisers
Answer Key:
b) hybridization
7. Plants having similar genotypes produced by plant breeding are called
a) clone
b) haploid
c) autopolyploid
d) genome
Answer Key:
a) clone
8. Importing better varieties and plants from outside and acclimatising them to local environment is called
a) cloning
b) heterosis
c) selection
d) introduction
Answer Key:
d) introduction
9. Dwarfing gene of wheat is
a) pal 1
b) Atomita 1
c) Norin 10
d) pelita 2
Answer Key:
c) Norin 10
10. Crosses between the plants of the same variety are called
a) interspecific
b) inter varietal
c) intra varietal
d) inter generic
Answer Key:
c) intra varietal
11. Progeny obtained as a result of repeat self pollination a cross pollinated crop to called
a) pure line
b) pedigree line
c) inbreed line
d) heterosis
Answer Key:
a) pure line
12. Jaya and Ratna are the semi dwarf varieties of
a) wheat
b) rice
c) cowpea
d) mustard
Answer Key:
b) rice
13. 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?
a) Saccharum robustum and Saccharum officinarum
b) Saccharum barberi and Saccharum officinarum
c) Saccharum sinense and Saccharum officinarum
d) Saccharum barberi and Saccharum robustum
Answer Key:
b) Saccharum barberi and Saccharum officinarum
14. 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 II III IV
a) iv iii ii i
b) ii i iii iv
c) ii iv i iii
d) i iii iv ii
Answer Key:
b) ii i iii iv
15. A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in
a) iron
b) carbohydrates
c) proteins
d) vitamins
Answer Key:
c) proteins
16. Which one of the following crop varieties correct matches with its resistance to a disease?
Answer Key:
a) Pusa Komal Bacterial blight
17. Which of the following is incorrectly paired?
a) Wheat - Himgiri
b) Milch breed - Sahiwal
c) Rice - Ratna
d) Pusa Komal – Brassica
Answer Key:
d) Pusa Komal – Brassica
18. Match list I with list II
a. ic, iia, iiib, ivd
b. id, iic, iiia, ivb.
c. ia, iic, iiib, ivd
d. ib, iia, iiid, ivc.
Answer Key:
b. id, iic, iiia, ivb.
Reason: Genetic variations are differences in genotypes of the individuals.
a) Assertion is right and reason is wrong.
b) Assertion is wrong and reason is right.
c) Both reason and assertion is right.
d) Both reason and assertion is wrong.
Answer Key:
b) Assertion is wrong and reason is right.
2. While studying the history of domestication of various cultivated plants _______ were recognized earlier
a) Centres of origin
b) Centres of domestication
c) Centres of hybrid
d) Centres of variation
Answer Key:
a) Centres of origin
3. Pick out the odd pair.
a) Mass selection - Morphological characters
b) Purline selection - Repeated self pollination
c) Clonal selection - Sexually propagated
d) Natural selection - Involves nature
Answer Key:
c) Clonal selection - Sexually propagated
4. 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
a) i – I, ii – II, iii – III, iv – IV
b) i – III, ii – I, iii – IV, iv – II
c) i – IV, ii – II, iii – I, iv – IV
d) i – II, ii – IV, iii – III, iv – I
Answer Key:
b) i – III, ii – I, iii – IV, iv – II
5. The quickest method of plant breeding is
a) Introduction
b) Selection
c) Hybridization
d) Mutation breeding
Answer Key:
d) Mutation breeding
6. Desired improved variety of economically useful crops are raised by
a) Natural Selection
b) hybridization
c) mutation
d) biofertilisers
Answer Key:
b) hybridization
7. Plants having similar genotypes produced by plant breeding are called
a) clone
b) haploid
c) autopolyploid
d) genome
Answer Key:
a) clone
8. Importing better varieties and plants from outside and acclimatising them to local environment is called
a) cloning
b) heterosis
c) selection
d) introduction
Answer Key:
d) introduction
9. Dwarfing gene of wheat is
a) pal 1
b) Atomita 1
c) Norin 10
d) pelita 2
Answer Key:
c) Norin 10
10. Crosses between the plants of the same variety are called
a) interspecific
b) inter varietal
c) intra varietal
d) inter generic
Answer Key:
c) intra varietal
11. Progeny obtained as a result of repeat self pollination a cross pollinated crop to called
a) pure line
b) pedigree line
c) inbreed line
d) heterosis
Answer Key:
a) pure line
12. Jaya and Ratna are the semi dwarf varieties of
a) wheat
b) rice
c) cowpea
d) mustard
Answer Key:
b) rice
13. 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?
a) Saccharum robustum and Saccharum officinarum
b) Saccharum barberi and Saccharum officinarum
c) Saccharum sinense and Saccharum officinarum
d) Saccharum barberi and Saccharum robustum
Answer Key:
b) Saccharum barberi and Saccharum officinarum
14. 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 II III IV
a) iv iii ii i
b) ii i iii iv
c) ii iv i iii
d) i iii iv ii
Answer Key:
b) ii i iii iv
15. A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in
a) iron
b) carbohydrates
c) proteins
d) vitamins
Answer Key:
c) proteins
16. Which one of the following crop varieties correct matches with its resistance to a 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
|
a) Pusa Komal Bacterial blight
17. Which of the following is incorrectly paired?
a) Wheat - Himgiri
b) Milch breed - Sahiwal
c) Rice - Ratna
d) Pusa Komal – Brassica
Answer Key:
d) Pusa Komal – Brassica
18. 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
|
b. id, iic, iiia, ivb.
c. ia, iic, iiib, ivd
d. ib, iia, iiid, ivc.
Answer Key:
b. id, iic, iiia, ivb.
II. Short Answer Questions
12th bio botanyIII. Long Answer Questions
12th bio botanyIV. Exercise
12thbio botany
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