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Biology (NCERT) - Class XII > Incorrect Practice Questions > Flashcards

Incorrect Practice Questions Flashcards

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1
Q

Which of the following secretes relaxin during the later stages of pregnancy?
corpus luteum - foetus - uterus - Graafian follicle

A

corpus luteum

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2
Q

Which of the following are correct regarding linked genes?
I. located next to each other on the same chromosome
II. violate the law of independent assortment
III. segregate together during meiosis

A

I, II & III

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3
Q

Down Syndrome was first described in the year

A

1866

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4
Q

Blood group antigens are ________

A

carbohydrates present on surface of RBCs

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5
Q

Find the incorrect match:
pedigree analysis - Mendelian trait
Henking’s X body - one each in sperm
Pleiotropy - Single gene multiple phenotype
Polygenic inheritance - across a gradient

A

Henking’s X body - one each in sperm

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6
Q

Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
Dominance, Co-dominance, Multiple dominance, Polygenic Inheritance, Incomplete dominance

A

Dominance, Co-dominance, Multiple dominance

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6
Q

The process of splicing in eukaryotes:

a) is reminiscent of antiquity
b) represents the dominance of RNA-world
c) is an indicator of the complexity of the human genome
d) is a legacy of organic evolution

A

b) represents the dominance of RNA-world

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7
Q

Which enzyme polymerizes RNA with defined sequences in a template independent manner?

A

Polynucleotide phosphorylase

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8
Q

The core RNA polymerase is capable of catalyzing which steps of transcription?
Initiation - Elongation - Termination - Al of these

A

Elongation only

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9
Q

Polymerisation of which of the following produces nucleic acids?
nucleosides - nucleotides - DNA and RNA - Both 1 and 2

A

nucleotides

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10
Q

In lac operon, repressor is inactivated by interaction with ________
carbohydrate - protein - nucleic acid - enzyme

A

carbohydrate

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11
Q

Hashish causes altered thought perceptions and hallucinations? T or F?

A

True

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12
Q

Opium stimulates the nervous system and causes hallucinations. T or F?

A

False

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13
Q

Barbiturates cause relaxation and temporary euphoria. T or F?

A

False

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14
Q

Which of the following sets of diseases is caused by bacteria?

a) Cholera and tetanus
b) Typhoid and smallpox
c) Tetanus and mumps
d) Herpes and influenza

A

a) Cholera and tetanus

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15
Q

As the housefly is related with Entamoeba histolytica, Aedes mosquito is related with _______

A

Virus

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16
Q

Cells of immune system that do not provide innate immunity:

T-lymphocytes - Neutrophils - NK cells - Macrophages

A

T-lymphocytes

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17
Q

Alpha-interferons can:

a) suppress the immune system
b) activate the immune system
c) destroy a tumor
d) both #2 and #3

A

d) both #2 and #3

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18
Q

Mast cells secrete ________

A

histamine

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19
Q

Vaccines are available for which of these diseases:

polio - diptheria - pneumonia - tetanus

A

all of them

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20
Q

Which is the most common mechanism of genetic variation in a population that reproduces asexually?

a) Transduction
b) Chromosomal aberrations
c) Genetic drift
d) Recombination

A

d) Recombination

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21
Q

Process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental change is:

a) adaptive radiation
b) non-random evolution
c) convergent evolution
d) natural selection

A

c) convergent evolution

22
Q

Which of the following are analogous structures?

a) Wings of bat and wings of pigeon
b) Gills of Prawn and Lungs of Man
c) Thorns of Bougainvillea and Tendrils of Cucurbita
d) Flippers of Dolphin and Legs of Horse

A

b) Gills of Prawn and Lungs of Man

23
Q

Hysterectomy is surgical removal of _____

A

uterus

24
Q

Assisted reproductive technology involves the transfer of:

a. ovum into fallopian tube
b. zygote into fallopian tube
c. zygote into uterus
d. embryo (up to 16 blastomeres) into fallopian tube

A

b. zygote into fallopian tube

25
Q

Cu ions released from IUDs:

a. make uterus unsuitable for implantation
b. increase phagocytosis of sperms
c. suppress sperm motility
d. prevent ovulation

A

c. suppress sperm motility (and fertilizing capacity)

26
Q

Which of the following is incorrect wrt vasectomy?

a) No sperm occurs in seminal fluid
b) No sperm occurs in vasa efferentia
c) Vasa deferentia is cut and tied
d) Irreversible sterility

A

b) No sperm occurs in vasa efferentia

27
Q

Which of the following is checked by amniocentesis?

a) Biochemical abnormalities in the foetus
b) Errors of metabolism in the foetus
c) Chromosomal abnormalities in the foetus
d) All of the above

A

c) Chromosomal abnormalities in the foetus

28
Q

The most important component of oral contraceptive pills is progesterone. T or F?

A

True

29
Q

Oral contraceptives do not work by:

a) inhibition of ovulation
b) changing the consistency of cervical mucus
c) antagonistic action on gonadotropins
d) spermicidal action

A

d) spermicidal action

30
Q

Saheli contains a steroidal preparation. True or False?

A

False, non-steroidal

31
Q

Pill is to be taken daily for ________

A

21 days beginning within first 5 days of menstruation

32
Q

In lactational amenorrhea, there is no ovulation or menstruation during period of intense lactation following parturition due to high level of prolactin which inhibits the release of _______

A

gonadotropins

33
Q

Several South Indian states yield 2-3 crops of rice annually. The agronomic feature that makes this possible is:

a) shorter rice plant
b) better irrigation facilities
c) early yielding rice variety
d) disease-resistant rice variety

A

c) early yielding rice variety

34
Q

Lysine and tryptophan are:

a) proteins
b) non-essential amino acids
c) essential amino acids
d) aromatic amino

A

c) essential amino acids

35
Q

Protoplast is:

a) another name for protoplasm
b) animal cell
c) plant cell without cell wall
d) plant cell

A

c) plant cell without cell wall

36
Q

The crops engineered for glyphosate are resistant/tolerant to _______

A

herbicides

37
Q

Bioethanol can be produced using which of the following plants:

a) Brassica
b) Zea maize
c) Jatropha
d) Pongamia

A

b) Zea maize

38
Q

Mutations can be induced with gamma or infrared radiations?

A

Gamma

39
Q

A system of rotating crops with legume or grass pasture to improve soil structure is called _______

A

ley farming

40
Q

NOT a step in MOET?

a) Cow is fertilized by artificial insemination
b) Fertilized eggs are transferred to surrogates at 8-32 cell stage
c) Cow is administered hormone that has LH-type activity for super ovulation
d) Cow yields about 6-8 eggs at a time

A

c) Cow is administered hormone that has LH-type activity for super ovulation

IT’S FSH!!!

41
Q

Himgiri, a disease-resistant plant variety is not associated with:

a) wheat
b) hill bunt
c) white rust
d) leaf and stripe rust

A

c) white rust

42
Q

Which of the following is not an insect pest resistant variety?

a) Pusa Gaurav
b) Pusa Sawani
c) Pusa A-4
d) Karan Rai

A

d) Karan Rai

43
Q

BOD of waste water is estimated by measuring the amount of:

a) total inorganic matter
b) biodegradable organic matter
c) oxygen evolution
d) oxygen consumption

A

d) oxygen consumption

44
Q

Methanogenic bacteria are not found in:

a) rumen of cattle
b) gobar gas plant
c) bottom of water-logged paddy fields
d) activated sludge

A

d) activated sludge

45
Q

Methane is the preferred carbon source of methanogens. True or False?

A

False

46
Q

Methane are archaebacteria. T or F?

A

True

47
Q

Trichoderma harzianum is a useful micro-organism for biological control of soil-borne plant pathogens. T or F?

A

True

48
Q

Baculoviruses are pathogens of anthropods used as biocontrol agents. T or F?

A

T

49
Q

Common biocontrol agent for plant disease is:

a) Bt
b) Glomus
c) Trichoderma
d) Baculovirus

A

c) Trichoderma

50
Q

Which of these is not a biofertilizer?

Rhizobium - Nostoc - Mycorrhiza - Agrobacterium

A

Agrobacterium

51
Q

Which helps in absorption of phosporus from soil by plants? Glomus or Rhizobium or Anabaena

A

Glomus

52
Q

Which of the following is not an example of a biopesticide:

a. Bt corn
b. Bt cotton
c. Bt soyabean
d. chili

A

d. chili

Biology (NCERT) - Class XII (18 decks)

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