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12th Standard Biology English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020

Published on: 25/08/2020

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

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Questions:

Multiple Choice Question

29 x 1 = 29

Which is not a macrophage?

(a)

Monocyte

(b)

Microglia

(c)

Kupffer cell

(d)

Lymphocyte

Groundnut is native of ____.

(a)

Philippines

(b)

India

(c)

North America

(d)

Brazil

The quickest method of plant breeding is _______.

(a)

Introduction

(b)

Selection

(c)

Hybridization

(d)

Mutation breeding

Deforestation means ______.

(a)

growing plants and trees in an area where there is no forest

(b)

growing plants and trees in an area where the forest is removed

(c)

growing plants and trees in a pond

(d)

Removal of plants and trees

Significance of food web is / are ______.

(a)

it does not maintain stability in nature

(b)

it shows patterns of energy transfer

(c)

it explains species interaction

(d)

b and c

Organisms which can survive a wide range of temperature are called

(a)

Ectotherms

(b)

Eurytherms

(c)

Endotherms

(d)

Stenotherms

Sticky glands of Boerhavia and Cleome support _______.

(a)

Anemochory

(b)

Zoochory

(c)

Autochory

(d)

Hydrochory

Arrange the correct sequence of ecological hierarchy starting from lower to higher level.

(a)

Individual organism → Population Landscape → Ecosystem

(b)

Landscape → Ecosystem → Biome → Biosphere

(c)

community → Ecosystem → Landscape → Biome

(d)

Population → organism → Biome → Landscape

Which among the following awards instituted by the Government of India for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting Wildlife?

(a)

Indira Gandhi Paryavaran Puraskar

(b)

Medini Puruskar Yojana

(c)

Amrita Devi Bishnoi Award

(d)

Pitambar Pant National Award

10.

Dolly, the sheep was obtained by a technique known as

(a)

Cloning by gene transfer

(b)

Cloning without the help of gametes

(c)

Cloning by tissue culture of somatic cells

(d)

Cloning by nuclear transfer

11.

Which of the following pair is correctly matched for the product produced by them?

(a)

Acetobacter aceti - Antibiotics

(b)

Methanobacterium - Lactic acid

(c)

Penicilium notatum - Acetic acid

(d)

Saccharomyces cerevisiae - Ethanol

12.

Which one of the following is not coming under insitu conservation

(a)

Sanctuaries

(b)

Natural parks

(c)

Zoological park

(d)

Biosphere reserve

13.

Micro propagation involves _____.

(a)

vegetative multiplication of plants by using micro-organisms.

(b)

vegetative multiplication of plants by using small explants.

(c)

vegetative multiplication of plants by using microspores.

(d)

Non-vegetative multiplication of plants by using microspores and megaspores.

14.

Which of the following was the contribution of Hugo de Vries?

(a)

Theory of mutation

(b)

Theory of natural Selection

(c)

Theory of inheritance of acquired characters

(d)

Germplasm theory

15.

Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

(a)

Syphilis, gonorrhoea and candidiasis

(b)

Syphilis, chlamydiasis and gonorrhoea

(c)

Syphilis, gonorrhoea and trichomoniasis

(d)

Syphilis, trichomoniasis and pediculosis

16.

Assertion (A): Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the root nodules of all cereals and pulse crops
Reason(R): A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the cross with which bacterium is associated.

(a)

Both assertion and reason are true. But reason is correct explanation of assertion.

(b)

Both assertion and reason are true. But reason is not correct explanation of assertion.

(c)

Assertion is true, but reason is false.

(d)

Assertion is false, but reason is true

(e)

Both assertion and reason are false.

17.

EcoRI cleaves DNA at ____.

(a)

AGGGTT

(b)

GTATATC

(c)

GAATTC

(d)

TATAGC

18.

When lactose is present in the culture medium:

(a)

Transcription of lac y, lac z, lac a genes occurs.

(b)

Repressor is unable to bind to the operator.

(c)

Repressor is able to bind to the operator.

(d)

Both (a) and (b) are correct.

19.

DNA and RNA are similar with respect to _____.

(a)

Thymine as a nitrogen base

(b)

A single-stranded helix shape

(c)

Nucleotide containing sugars, nitrogen bases and phosphates

(d)

The same sequence of nucleotides for the amino acid phenyl alanine

20.

The mature sperms are stored in the ____.

(a)

Seminiferous tubules

(b)

Vas deferens

(c)

Epididymis

(d)

Seminal vesicle

21.

ZW-ZZ system of sex determination occurs in _____.

(a)

Fishes

(b)

Reptiles

(c)

Birds

(d)

All of these

22.

Exo-erythrocytic schizogony of Plasmodium takes place in _______

(a)

RBC

(b)

Leucocytes

(c)

Stomach

(d)

Liver

23.

In which type of parthenogenesis are only males produced?

(a)

Arrhenotoky

(b)

Thelytoky

(c)

Amphitoky

(d)

Both a and b

24.

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 B C D i iii ii iv

(b)

A B C D ii iii iv i

(c)

A B C D ii iii i iv

(d)

A B C D iii ii i iv

25.

Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

(a)

I^A I^B and I^oI^o

(b)

I^A I^o and I^BI^o

(c)

I^B I^B and I^A I^A

(d)

I^A I^A and I^oI^o

26.

Select the period for Mendel’s hybridization experiments.

(a)

1856 - 1863

(b)

1850 - 1870

(c)

1857 - 1869

(d)

1870 - 1877

27.

In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype _____.

(a)

aaBB

(b)

AaBB

(c)

AABB

(d)

aabb

28.

In majority of plants pollen is liberated at _____.

(a)

1 celled stage

(b)

2 celled stage

(c)

3 celled stage

(d)

4 celled stage

29.

An eminent Indian embryologist is ______.

(a)

S.R. Kashyap

(b)

P. Maheswari

(c)

M.S. Swaminathan

(d)

K.C. Mehta

Assertion and reason

1 x 2 = 2

30.

Assertion(A): Ovulation is the release of ovum from the Graafian follicle.
Reason(R): It occurs during the follicular phase of the menstrual cycle.
Codes:
(a) A and R are true, R is the correct explanation of A
(b) A and R are true, R is not the correct explanation of A
(c) A is true, R is false
(d) Both A and R are false

(a)

A and R are true, R is the correct explanation of A

(b)

A and R are true, R is not the correct explanation of A

(c)

A is true, R is false

(d)

Both A and R are false