12th Bio - Botany - Book Back Answers - Chapter 3 - English Medium Guides

 

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Tamil Nadu Board 12th Standard Bio-Botany - Chapter 3: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Chapter 3 – Bio-Botany from the Tamil Nadu State Board 12th Standard Bio-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 Bio-Botany Chapter 3 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!

I. Multiple Choice Questions

1. An allohexaploidy contains
a) Six different genomes
b) Six copies of three different genomes
c) Two copies of three different genomes
d) Six copies of one genome
Answer Key:
c) Two copies of three different genomes

2. Match list I with list II

List I	List II
A. A pair of chromosomes extra with diploid	i) monosomy
B. One chromosome extra to the diploid	ii) tetrasomy
C. One chromosome loses from diploid	iii) trisomy
D. Two individual chromosomes lose from diploid	iv) double monosomy

a) A-i, B-iii, C-ii, D-iv
b) A-ii, B-iii, C-iv, D-i
c) A-ii, B-iii, C-i, D-iv
d) A-iii, B-ii, C-i, D-iv
Answer Key:
c) A-ii, B-iii, C-i, D-iv

3. Which of the following sentences are correct?
1. The offspring exhibit only parental combinations due to incomplete linkage
2. The linked genes exhibit some crossing over in complete linkage
3. The separation of two linked genes are possible in incomplete linkage
4. Crossing over is absent in complete linkage
a) 1 and 2
b) 2 and 3
c) 3 and 4
d) 1 and 4
Answer Key:
c) 3 and 4

4. Due to incomplete linkage in maize, the ratio of parental and recombinants are
a) 50:50
b) 7:1:1:7
c) 96.4: 3.6
d) 1:7:7:1
Answer Key:

5. The point mutation sequence for transition, transition, transversion and transversion in DNA are
a) A to T, T to A, C to G and G to C
b) A to G, C to T, C to G and T to A
c) C to G, A to G, T to A and G to A
d) G to C, A to T, T to A and C to G
Answer Key:
c) C to G, A to G, T to A and G to A

6. If haploid number in a cell is 18. The double monosomic and trisomic number will be
a) 34 and 37
b) 34 and 35
c) 37 and 35
d) 17 and 19
Answer Key:
b) 34 and 35

7. Changing the codon AGC to AGA represents
a) missense mutation
b) nonsense mutation
c) frameshift mutation
d) deletion mutation
Answer Key:
a) missense

8. Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.
Reason (R): Because they carry lower energy to non-ionize electrons from atom
a) A and R are correct
b) A is correct. R is wrong
c) A is wrong. R is correct
d) A and R are wrong
Answer Key:
b) A is correct. R is

II. Short Answer Questions

12th bio botany

III. Long Answer Questions

12th bio botany

IV. Exercise

12thbio botany