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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard Botany - Chromosomal Basis of Inheritance English Medium Free Online Test One Mark Questions 2020 - 2021

Published on: 05/11/2020

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.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

Statement 1: In transversion mutation, single purine is changed to pyrimidine.
Statement 2: In transition mutation, a purine replaced by another purine.

(a)

Statement 1 is correct and Statement 2 is incorrect

(b)

Statement 1 is incorrect and Statement 2 is correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

Pick out the co-mutagen from the following:

(a)

Eosin

(b)

Mustard gas

(c)

Ascorbic acid

(d)

Nitrous acid

Which is not a non-ionizing radiation?

(a)

X-rays

(b)

Gamma rays

(c)

Alpha rays

(d)

UV rays

Recombination frequency (RF) is equal to

(a)

\(\frac { No.ofoffsprings }{ No.ofrecombinants } \times 100\)

(b)

\(\frac { No.of\ recombinants }{ No.ofparentalstrains } \times 100\)

(c)

\(\frac { No.ofrecombinants }{ No.ofoffsprings } \times 100\)

(d)

\(\frac { No.ofoffsprings }{ No.ofparentalstrains } \times 100\)

Mechanism of crossing over involves the following stages. Select the correct sequence.

(a)

Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over

(b)

Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation

(c)

Terminalisation ~ Tetrad ~ Bivalent ~ Cross over

(d)

Cross over ~ Bivalent ~ Tetrad ~ Terminalisation

Name the scientist(s) who rediscovered the Mendelian work?
(i) Hugo de Vries
(ii) Carl Correns
(iii) Tschermak
(iv) T.H. Morgan

(a)

i and iv

(b)

i, ii and iv

(c)

i, ii and iii

(d)

ii, iii and iv

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

Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is _____.

(a)

GHSL

(b)

SHGL

(c)

SGHL

(d)

HSLG

Accurate mapping of genes can be done by three point test cross because increases _____.

(a)

Possibility of single cross over

(b)