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

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Questions:

Multiple Choice Question

57 x 1 = 57

Atavism refers to _______.

(a)

Inheritance of trial by mother

(b)

Inheritance of trial by father

(c)

Criss-cross inheritance

(d)

Inheritance of characters not shown by parents

Functional status of an organism in its community is _______________

(a)

Biome

(b)

Niche

(c)

Species

(d)

Population

Statement (1): The intensity of noise is measured in dobson (dB) unit.
Statement (2): Noise provides immense bliss.

(a)

Statement 1 is true, statement 2 is false

(b)

Statement 1 is false, statement 2 is true

(c)

Both Statements 1 and 2 are true

(d)

Both statements 1 and 2 are false

Which is not a method of disposal of radioactive waste.

(a)

Dilute and dispense

(b)

Delay and decay

(c)

Recycle and reuse

(d)

Limit generation

Pick out the incorrect statement

(a)

tRNA acts as an adapter molecule

(b)

Stop codons do not have tRNA's

(c)

Addition of amino acid leads to hydrolysis of tRNA

(d)

tRNA has four major loops

Find the odd sentence out.
(i) Biogas primarily consists of methane with CO₂ and hydrogen
(ii) The greater the BOD of wastewater the more its polluting potential
(iii) World biofuel day is observed on 10th August
(iv) Cyclosporin A is obtained from Trichoderma polysporum.

(a)

i and iii

(b)

ii and iv

(c)

i and iv

(d)

none of the above

Statement 1: Exotic species are the non-native organism.
Statement 2: Sailfin catfish is an exotic species to India

(a)

Statement 1 is correct, statement 2 in incorrect

(b)

Statement 1 is incorrect, statement 2 in correct

(c)

Both the statements are correct

(d)

Both the statements are incorrect

The gene for the formation of factor VIII is located in________

(a)

20^thChromosome

(b)

12^th Chromosome

(c)

X-chromosome

(d)

Y-chromosome

Identify the wrong statement regarding polio disease.

(a)

Polio is caused by a RNA virus

(b)

One of the infection site of polio is intestine

(c)

Culex mosquito acts as a vector for polio.

(d)

Paralysis and respiratory failure are the symptoms.

10.

A colorblind man marries a woman with normal sight who has no history of color blindness in her family. What is the probability of their grandson being colorblind?

(a)

1/4

(b)

3/4

(c)

2/4

(d)

4/4

11.

Statement (1): Siamese twins are conjoined twins who are joined during birth.
Statement (2): Dizygotic twins will be of same sex

(a)

Statement 1 is correct; statement 2 is incorrect.

(b)

Statement 1 is incorrect; statement 2 is correct.

(c)

Both the statements 1 and 2 are correct.

(d)

Both the statements 1 and 2 are incorrect.

12.

Assertion (A): Human ovum is non - cleidoic
Reason (R): Human does not contain yolk.

(a)

R explains A

(b)

A is right, R is wrong

(c)

A and R are right. R does not explain A.

(d)

Both A and R are wrong

13.

Statement 1: Euploidy involves entire sets of chromosomes
Statement 2: Aneuploidy involves individual chromosomes within a diploid net.

(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

14.

RR (Red) flower of Mirabilis is crossed with White (WW) flowers. Resultant offspring are pink RW. This is an example of __________

(a)

Epistasis

(b)

Co-dominance

(c)

Incomplete dominance

(d)

Pleiotropism

15.

In monoecious plants,

(a)

Both autogamy and geitonogamy are prevented

(b)

Both autogamy and geitonogamy are takes place

(c)

Autogamy takes place preventing geitonogamy

(d)

Autogamy is prevented whereas geitonogamy takes place

16.

Gregor Mendel ___________
(i) was born in Czechoslovakia
(ii) did his experiments in Pisum fulvum
(iii) was the first systemic researcher in genetics
(iv) Published his results in the paper "Experiments on Plant Hybrids"

(a)

All are correct

(b)

(ii), (iii), (iv) are correct

(c)

(i), (iii),(iv) are correct

(d)

(i), (iii), (iv) are correct

17.

The white edible part of coconut is __________________

(a)

Epicarp

(b)

Endosperm

(c)

Embryo

(d)

Mesocarp

18.

Assertion (A): Fusion of male and female gametes results in zygote.
Reason (R): Product of triple fusion is PEN.

(a)

A is correct R is incorrect.

(b)

R explains A.

(c)

Both A and R are incorrect.

(d)

Both A and R are correct. R does not explain A.

19.

Statement 1: Holoparasites depend totally on other organisms for nutrition.
Statement 2: Durnta is holoparasite.

(a)

Statement 1 is correct. Statement 2 is incorrect.

(b)

Statement 1 is incorrect. Statement 2 is correct

(c)

Both the statements are correct.

(d)

Both the statements are incorrect

20.

Statement 1: The pollen grains are deposited on the receptive surface of style.
Statement 2: After landing, the first visible change in pollen is hydration.

(a)

Statement 1 is correct and statement 2 is incorrect.

(b)

Statement 1 is incorrect and statement 2 is correct.

(c)

Both the statements 1 and 2 are correct.

(d)

Both the statements 1 and 2 are incorrect

21.

Which of the following characters does not exist in Ornithophilous flowers?

(a)

Huge sized flowers

(b)

Bright coloured

(c)

Scented flowers

(d)

Nectar is secreted in large

22.

Which of the following is abundant in rock deposits and guano?

(a)

Nitrogen

(b)

Phosphorous

(c)

Oxygen

(d)

Calcium

23.

Which group of organism occupies the third tropic level in an ecosystem?

(a)

Primary consumers

(b)

Secondary consumers

(c)

Secondary carnivores

(d)

Omnivores

24.

Dimethyl sulphoxide is a _________.

(a)

Solidifying agent

(b)

Cryoprotectant

(c)

Fusogenic agent

(d)

Stimulant

25.

The first established Atomic Garden in India was _________

(a)

Bhabha Atomic Research Institute

(b)

Indira Gandhi Centre for Atomic Research

(c)

Indian Agricultural Research Institute

(d)

Bose Research Institute

26.

EIA stands for ________________

(a)

Ecological Information Analysis

(b)

Environmental Information Assessment

(c)

Environmental Impact Analysis

(d)

Environmental Impact Assessment

27.

Azolla is best suited biofertilizer for _________

(a)

Sugar cane cultivation

(b)

Paddy cultivation

(c)

Wheat cultivation

(d)

Cotton cultivation

28.

The total ozone layer over the earth surface is ____________________

(a)

30 DU

(b)

300 DU

(c)

3000 DU

(d)

0.3 DU

29.

Pigeon pea is the common name for _______

(a)

Vigna radiata

(b)

Vigna mungo

(c)

Cajanus cajan

(d)

Sorghum vulgare

30.

A river with an inflow of domestic sewage rich in organic waste may result in:

(a)

Drying of the river very soon due to algal bloom

(b)

Increased population of aquatic food web organisms

(c)

An increased production of fish due to biodegradable nutrients

(d)

Death of fish due to lack of oxygen

31.

Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?

(a)

5' - CGTTCG - 3' 3' -ATGGTA -5'

(b)

5'-GATATG -3' 3' CTACTA -5'

(c)

5' -GAATTC - 3' 3' - CTTAAG-5'

(d)

5' -CACGTA -3' 3' -CTCAGT -5'

32.

ABO blood groups in humans are controlled by the gene I, It has three alleles - IA, IB and i. Since there are three different alleles) six different genotypes are possible. How many phenotypes can occur?

(a)

Three

(b)

One

(c)

Four

(d)

Two

33.

Given below, are a few statements related to external fertilization. Choose the correct statements:
i. The male and female gametes are formed and released simultaneously
ii. Only a few gametes are released into the medium
iii. Water is the medium in a majority of organism exhibiting external fertilization
iv. Offspring formed as a result of external fertilization have better chance of survival than those formed inside the organism

(a)

iii and iv

(b)

i and iii

(c)

ii and iv

(d)

i and iv

34.

PCB is a major component of ______________

(a)

e-waste

(b)

Agro waste

(c)

sewage

(d)

Plastics

35.

This is a waveform of selection but leads to formation of two or more different species

(a)

Adaptive radiation

(b)

Directional selection

(c)

Centipetal selection

(d)

Stabilizing selection

36.

____________ is a condition in which there is absence of spermatozoa in the ejaculate serum

(a)

teratozoospermia

(b)

Asthenozoospermia

(c)

Oligozoospermia

(d)

Azoospermia

37.

_____ is an example of a contraceptive pill.

(a)

Alesse

(b)

Ortho Tri-cyclen

(c)

Saheli

(d)

Eryosterol

38.

Origin of fishes occurred in ___________ period

(a)

Devonian

(b)

Silurian

(c)

Cambrian

(d)

Permian

39.

___________ is not a exotic species.

(a)

Amazon sailfin catfish

(b)

Mealy Bug

(c)

Narcondam horn bills

(d)

Achatina fulica

40.

This technique is used to diagnose the chromosomal abnormities.

(a)

Assisted Reproductive Technology (ART)

(b)

Micro Testicular Sperm Extraction

(c)

Amniocentesis

(d)

GIFT

41.

Cryopreservation of embryos are done when _____

(a)

When eggs are not available

(b)

Sperm count is less

(c)

More embryos are available than the required

(d)

there is abnormality in the embryo

42.

_________is used for recycling of PET plastics

(a)

Dechloromonas aromatica

(b)

Phanerochaete chrysosporium

(c)

Ideonella sakaiensis

(d)

Nitrosomonas

43.

1000 fish in the volume of water in the pond indicates _____________________

(a)

Relative abundance

(b)

Ecological density

(c)

Crude density

(d)

Population density

44.

___________among the following will not serve as store house of stem cell.

(a)

Blood

(b)

Bone marrow

(c)

Amniotic fluid

(d)

Placenta

45.

_________is not linked to IPR.

(a)

Patents

(b)

Copy rights

(c)

(d)

trademarks

46.

_____ is a hormone secreted by the placenta and also found in the corpus luteum

(a)

Oxytocin

(b)

Relaxin

(c)

Inhibin

(d)

Testosterone

47.

______ is a hormone produced by sertoli cells.

(a)

Inhibin

(b)

Progesterone

(c)

Testosterone

(d)

Oestrogen

48.

Chromosome __________ has 231 genes only.

(a)

(b)

(c)

(d)

49.

Yellowish eyes is a symptom of_______

(a)

Plague

(b)

Measles

(c)

Hepatitis

(d)

Sleeping sickness

50.

Human Genome was sequenced in ________.

(a)

1979

(b)

2015

(c)

1989

(d)

2001

51.

In honey bees, the mode of reproduction is

(a)

Sexual and Asexual

(b)

Sexual and Parthenogenesis

(c)

Asexual and Parthenogenesis

(d)

All the above

52.

Plasmotomy is observed in ________

(a)

Giant Amoeba

(b)

Hydra

(c)

Plasmodium

(d)

Ceratium

53.

Spermatid \(\overset { A }{ \rightarrow }\) Spermatozoa what does 'A' stands for?

(a)

Spermatogenesis

(b)

Spermiation

(c)

Spermiogenesis

(d)

Gametogenesis

54.

Select the proper harmonal Composition of oral Contraceptive pills

(a)

FSH and Prolactin

(b)

prolactin & TSH

(c)

TSH & FSH

(d)

FSH & LH

55.

Trisomy 21 refers to ___________.

(a)

Patau's syndrome

(b)

Down's syndrome

(c)

Kline filters syndrome

(d)

Turners syndrome

56.

The inheritance of blood group is determined by multiple alleles as discovered by _________.

(a)

Landsteiner

(b)

Bernstein

(c)

Alexander castelle

(d)

lyon

57.

Enhanced attachment is also known as ________

(a)

Opsonisation

(b)

Precipitation

(c)

agglutination

(d)

neutralisation

Assertion and reason

1 x 2 = 2

58.

Assertion (A): IUD's are inserted in the ovary.
Reason (R): IUD's Increases phagocytosis of the sperm.
Codes:
(a) Both A and R are correct
(b) Both A and R are incorrect
(c) A is correct R is incorrect
(d) A is incorrect R is correct

(a)

Both A and R are correct

(b)

Both A and R are incorrect

(c)

A is correct R is incorrect

(d)

A is incorrect R is correct

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Answers Key:

Multiple Choice Question

57 x 1 = 57

(d)
Inheritance of characters not shown by parents

(b)
Niche

(d)
Both statements 1 and 2 are false

(d)
none of the above

10.

(a)
1/4

11.

(a)
Statement 1 is correct; statement 2 is incorrect.

12.

13.

14.

15.

(d)
Autogamy is prevented whereas geitonogamy takes place

16.

17.

(b)
Endosperm

18.

(d)
Both A and R are correct. R does not explain A.

19.

20.

(b)
Statement 1 is incorrect and statement 2 is correct.

21.

22.

(b)
Phosphorous

23.

(b)
Secondary consumers

24.

(b)
Cryoprotectant

25.

(d)
Bose Research Institute

26.

(d)
Environmental Impact Assessment

27.

(b)
Paddy cultivation

28.

(b)
300 DU

29.

30.

(d)
Death of fish due to lack of oxygen

31.

32.

33.

(b)
i and iii

34.

(a)
e-waste

35.

(a)
Adaptive radiation

36.

(d)
Azoospermia

37.

38.

(b)
Silurian

39.

40.

41.

42.

43.

(b)
Ecological density

44.

(a)
Blood

45.

46.

(b)
Relaxin

47.

(a)
Inhibin

48.

49.

50.

(d)
2001

51.

(b)
Sexual and Parthenogenesis

52.

(a)
Giant Amoeba

53.

(a)
Spermatogenesis

54.

(a)
FSH and Prolactin

55.

(b)
Down's syndrome

56.

(b)
Bernstein

57.

(a)
Opsonisation

Assertion and reason

1 x 2 = 2

58.

(d) A is incorrect R is correct

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

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