12th Standard English Medium Biology Reduced Syllabus One mark Important Questions - 2021(Public Exam )

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Questions:

Multiple Choice Question

49 x 1 = 49

What is the role of fimbriae?

(a)

Secretion of oestrogen and prolactin.

(b)

Helps in the collection of the ovum after ovulation

(c)

Attaches the ovary to the abdominal cavity.

(d)

Cormects oviduct with ovary

Statement (1): Human pregnancy lasts for 35 weeks.
Statement (2): During gestation, embryo's heat develops during 12th week

(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 correct

Organ of copulation in human female is __________________

(a)

Cevix

(b)

Fundus

(c)

Vagina

(d)

Uterus

Assertion (A): In scrotum, the temperature is maintained 2 - 3°C lower than body temperature.
Reason (R): Reduced temperature results in efficient sperm production

(a)

R explains A.

(b)

A is right R is wrong.

(c)

A and R are right. R does not explains A

(d)

Both A and R are wrong

Which among the following animal is not a continuous breeder?

(a)

Hen

(b)

Rabbit

(c)

Honey bees

(d)

Frogs

Hormones secreted by placenta to maintain pregnancy are

(a)

hCG, hPL, progesterone, estrogen

(b)

hCG, hPL, estrogen, relaxin, oxytocin

(c)

hCG, hPL, progesterone, prolactin

(d)

hCG, progesterone, estrogen, glucocorticoids

Identify the correct statement on 'inhibition'.

(a)

is produced by granulose cells in ovary and inhibits the secretion of FSH

(b)

is produced by granulose cells in ovary and inhibits the secretion of LH

(c)

is produced by nurse cells in testes and inhibits the secretion of LH

(d)

inhibits the secretion of LH, FSH and prolactin.

The hormone ____ brings about powerful contraction of uterine muscles during child birth.

(a)

Relaxin

(b)

Oestrogen

(c)

Progesterone

(d)

Oxytocin

The _____ prevents poly spermy.

(a)

vitelline membrane

(b)

fertilization membrane

(c)

zona pellucida

(d)

corona radiata

10.

The _____ are modified sweat gland seen in both sexes

(a)

Skene's glands

(b)

Bartholin's glands

(c)

Mammary gland

(d)

Cowper's gland

11.

Bulbourethral glands are also called ______

(a)

prostate gland

(b)

Cowper's gland

(c)

Skene's glands

(d)

Bartholin's glands

12.

Attachment of blastocyst to the uterine wall is called ______

(a)

Implantation

(b)

Parturition

(c)

Insemination

(d)

gastrulation

13.

______ refers to the fusion of small sized, morphologically different gametes.

(a)

Isogamy

(b)

Hologamy

(c)

Paedogamy

(d)

Merogamy

14.

Paramecium and planaria show _____ types of division during asexual reproduction

(a)

Transverse binary fission

(b)

Longitudinal binary fission

(c)

Simple binary fission

(d)

Oblique binary fission

15.

Multiple fission is seen in _______

(a)

Vorticella and ceratium

(b)

Plasmodium and paramecium

(c)

Amoeba and cyanobacteria

(d)

Vorticella and plasmodium

16.

Assertion (A): The acrosome of the Sperm cell contains Sperm lysin.
Reason (R): Sperm lysin destroys the deformed Sperm cells.

(a)

R explains A

(b)

A is right R is wrong

(c)

A an R are right R does not explains A

(d)

Both A and R are wrong

17.

New world species of cotton _____.

(a)

Gossypium arboretum

(b)

G. herbaceum

(c)

Both a and b

(d)

Gossypium barbadense

18.

Jaya and Ratna are the semi dwarf varieties of ______.

(a)

wheat

(b)

rice

(c)

cowpea

(d)

mustard

19.

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

20.

With respect to Eichhornia
Statement A: It drains off oxygen from water and is seen growing in standing water.
Statement B: It is an indigenous species of our country.

(a)

Statement A is correct and Statement B is wrong

(b)

Both Statements A and B are correct

(c)

Statement A is correct and Statement B is wrong.

(d)

Both statements A and B are wrong

21.

Solar energy used by green plants for photosynthesis is only ______.

(a)

2 – 8%

(b)

2 – 10%

(c)

3 – 10%

(d)

2 – 9%

22.

Animals that can move from fresh water to sea called as______

(a)

Stenothermal

(b)

Eurythermal

(c)

Catadromous

(d)

Anadromous

23.

Predation and parasitism are which type of interactions?

(a)

(+,+)

(b)

(+, O)

(c)

(--, --)

(d)

(+, --)

24.

Strong, sharp spines that get attached to animal’s feet are found in the fruits of ______.

(a)

Argemone

(b)

Ecballium

(c)

Heritier

(d)

Crossandra

25.

The plant of this group are adapted to live partly in water and partly above substratum and free from water ______.

(a)

Xerophytes

(b)

Mesophytes

(c)

Hydrophytes

(d)

Halophytes

26.

Which of the given plant produces cardiac glycosides?

(a)

Calotropis

(b)

Acacia

(c)

Nepenthes

(d)

Utricularia

27.

In the E- waste generated by the Mobile Phones, which among the following metal is most abundant?

(a)

Copper

(b)

Silver

(c)

Palladium

(d)

Gold

28.

With which of the following, the Agenda 21’ of Rio Summit, 1992 is related to?

(a)

Sustainable development

(b)

Combating the consequences of population

(c)

Mitigation norms of Green House Gases (GHGs) emission

(d)

Technology transfer mechanism to developing countries for ‘clean-energy’ production

29.

Which one of the following statements is true regarding DNA polymerase used in PCR?

(a)

It is used to ligate introduced DNA in recipient cells

(b)

It serves as a selectable marker

(c)

It is isolated from a Virus

(d)

It remains active at a high temperature

30.

Cyclosporin – A is an immunosuppressive drug produced from _______

(a)

Aspergillus niger

(b)

Manascus purpureus

(c)

Penicillium notatum

(d)

Trichoderma polysporum

31.

Who introduced the term biodiversity?

(a)

Edward Wilson

(b)

Walter Rosen

(c)

Norman Myers

(d)

Alice Norman

32.

Cryopreservation means it is a process to preserve plant cells, tissues or organs _____.

(a)

at very low temperature by using ether.

(b)

at very high temperature by using liquid nitrogen

(c)

at very low temperature of -196°C by using liquid nitrogen

(d)

at very low temperature by using liquid nitrogen

33.

Totipotency refers to _____.

(a)

capacity to generate genetically identical plants.

(b)

capacity to generate a whole plant from any plant cell / explant.

(c)

capacity to generate hybrid protoplasts.

(d)

recovery of healthy plants from diseased plants.

34.

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

35.

Read the given statements and select the correct option.
Statement 1: Diaphragms, cervical caps and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
Statement 2: They are chemical barriers of conception and are reusable.

(a)

Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

(b)

Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

(c)

Statement 1 is correct but statement 2 is incorrect

(d)

Both statements 1 and 2 are incorrect

36.

pBR 322, BR stands for ______.

(a)

Plasmid Bacterial Recombination

(b)

Plasmid Bacterial Replication

(c)

Plasmid Bolivar and Rodriguez

(d)

Plasmid Baltimore and Rodriguez

37.

Plasmids are ______.

(a)

circular protein molecules

(b)

required by bacteria

(c)

tiny bacteria

(d)

confer resistance to antibiotics

38.

A mRNA molecule is produced by _____.

(a)

Replication

(b)

Transcription

(c)

Duplication

(d)

Translation

39.

The glandular accessory organ which produces the largest proportion of semen is ______.

(a)

Seminal vesicle

(b)

Bulbourethral gland

(c)

Prostate gland

(d)

Mucous gland

40.

Pataus syndrome is also referred to as ______.

(a)

13-Trisomy

(b)

18-Trisormy

(c)

21-Trisormy

(d)

None of these

41.

Exo-erythrocytic schizogony of Plasmodium takes place in _______

(a)

RBC

(b)

Leucocytes

(c)

Stomach

(d)

Liver

42.

The mode of sexual reproduction in bacteria is by ______.

(a)

Formation of gametes

(b)

Endospore formation

(c)

Conjugation

(d)

Zoospore formation

43.

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

(a)

Possibility of single cross over

(b)

Possibility of double cross over

(c)

Possibility of multiple cross over

(d)

Possibility of recombination frequency

44.

Which of the following phenotypes is not possible in the progeny of the parental genotypic combination I^AI^O x I^AI^B?

(a)

(b)

(c)

(d)

45.

The dominant epistasis ratio is ______.

(a)

9:3:3:1

(b)

12:3:1

(c)

9:3:4

(d)

9:6:1

46.

Fruit colour in squash is an example of ______.

(a)

Recessive epistasis

(b)

Dominant epistasis

(c)

Complementary genes

(d)

Inhibitory genes

47.

Extra nuclear inheritance is a consequence of presence of genes in _____.

(a)

Mitrochondria and chloroplasts

(b)

Endoplasmic reticulum and mitrochondria

(c)

Ribosomes and chloroplast

(d)

Lysososmes and ribosomes

48.

In Haplopappus gracilis, number of chromosomes in cells of nucellus is 4. What will be the chromosome number in Primary endosperm cell?

(a)

(b)

(c)

(d)

49.

First cell of male gametophyte in angiosperm is ______.

(a)

Microspore

(b)

megaspore

(c)

Nucleus

(d)

Primary Endosperm Nucleus

Assertion and reason

1 x 2 = 2

50.

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

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Answers Key:

Multiple Choice Question

49 x 1 = 49

(b)
Helps in the collection of the ovum after ovulation

(d)
Both the statements 1 and 2 are correct

(a)
R explains A.

(d)
Frogs

(b)
hCG, hPL, estrogen, relaxin, oxytocin

(a)
is produced by granulose cells in ovary and inhibits the secretion of FSH

(d)
Oxytocin

(b)
fertilization membrane

10.

11.

(b)
Cowper's gland

12.

(a)
Implantation

13.

(d)
Merogamy

14.

(a)
Transverse binary fission

15.

(d)
Vorticella and plasmodium

16.

(b)
A is right R is wrong

17.

(d)
Gossypium barbadense

18.

(b)
rice

19.

(a)
Centres of origin

20.

(a)
Statement A is correct and Statement B is wrong

21.

(b)
2 – 10%

22.

23.

(d)
(+, --)

24.

(a)
Argemone

25.

26.

(a)
Calotropis

27.

(a)
Copper

28.

(b)
Combating the consequences of population

29.

(d)
It remains active at a high temperature

30.

(d)
Trichoderma polysporum

31.

(b)
Walter Rosen

32.

33.

34.

(a)
Theory of mutation

35.

36.

37.

(d)
confer resistance to antibiotics

38.

(b)
Transcription

39.

(a)
Seminal vesicle

40.

(a)
13-Trisomy

41.

(d)
Liver

42.

43.

(d)
Possibility of recombination frequency

44.

(b)
O

45.

(b)
12:3:1

46.

(b)
Dominant epistasis

47.

(a)
Mitrochondria and chloroplasts

48.

49.

(a)
Microspore

Assertion and reason

1 x 2 = 2

50.

12th Standard English Medium Biology Reduced Syllabus One mark Important Questions - 2021(Public Exam )

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