Question Set D

CBSE 12th Standard Biology Ecosystem HOT Questions Study Material - QB365

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Questions:

Multiple Choice Question

59 x 1 = 59

Match list I with List II and choose the correct answer

List I	List II
A. Hypothalamus	1. Sprem lysins
B. Acrosome	2. Estrogen
C. Graafian follicle	3. Relaxin
D. Leydig cells	4. Gn RH
E. Parturition	5.Testosterone

(a)

A-4, B-1, C-2, D-3, E-5

(b)

A-2, B-1, C-4, D-3, E-5

(c)

A-2, B-1, C-5, D-4, E-3

(d)

A-4, B-1, C-2, D-5, E-3

(e)

A-5, B-1, C-3, D-2, E-4

Sweet potato is homologous to

(a)

potato

(b)

colocasia

(c)

ginger

(d)

turnip

Cause of speciation is

(a)

Random mating

(b)

Hybridization

(c)

Isolation

(d)

Migration

SWan-necked flask experiment was done by

(a)

Aristotle

(b)

Francisco Redi

(c)

Louis Pasteur

(d)

Robert Koch

Restriction endonucleases are enzymes which

(a)

Remove nucleotides from ends of DNA molecule

(b)

make cuts at specific positions within the DNA molecule

(c)

recognise a specific nucleotide sequence for binding of DNA ligase

(d)

restrict the action of enzyme DNA polymerase

The embryo at 16 celled stage is known as

(a)

morula

(b)

gastrula

(c)

blastula

(d)

blastomere

Which one of the following events is correctly matched with the time period in a normal menstrual cycle?

(a)

Release of egg: 5-10 days

(b)

Endometrium regenerates: 5-10 days

(c)

Endometrium secretes nutrients for implantation: 11-18 days

(d)

Rise in progesterone level: 1-15 days

Nuisance growth of aquatic plants and bloom-forming algae in natural waters is generally due to high concentration of:

(a)

carbon

(b)

sulphur

(c)

calcium

(d)

phosphorus

Which one of the following diseases is not due to contamination of water?

(a)

Hepatitis-B

(b)

Jaundice

(c)

Cholera

(d)

Typhoid

10.

The finches of Galapagos islands provide an evidence in favour of

(a)

evolution due to mutation

(b)

retrogressive evolution

(c)

biogeographical evolution

(d)

special creation

11.

If the base sequence of a codon in mRNA is 5' - AUG-3', the sequence of tRNA pairing with it must be:

(a)

5' - UAC -3'

(b)

5' - CAU -3'

(c)

5' - AUG -3'

(d)

5' - GUA -3'

12.

Xenograft means

(a)

A graft between two genetically identical individuals

(b)

A graft in which a tissue is grafted from one individual to another individuals of the same species

(c)

A graft between individuals of different species

(d)

Tissue grafted from one area to another of the same individual

13.

India's share in the global species diversity is about

(a)

(b)

(c)

(d)

14.

The final stable community in ecological succession is

(a)

pioneers

(b)

sere

(c)

climax

(d)

carnivores

15.

Which of the ecological pyramid is always straight?

(a)

pyramid of numbers

(b)

pyramid of biomass

(c)

pyramid of energy

(d)

none of these

16.

Ultra violet radiations from sunlight causes a reaction that produces

(a)

fluorides

(b)

carbon monoxide

(c)

sulphur dioxide

(d)

ozone

17.

Term ecosystem was given by

(a)

Odum

(b)

Haeckel

(c)

Tansley

(d)

Mobius and Forbes

18.

The world biodiversity day is celebrated annually on

(a)

5th June

(b)

29th December

(c)

22nd April

(d)

16th September

19.

If the Bengal tiger becomes extinct

(a)

Hyaenas and Wolves will become scarce

(b)

The wild areas will be safe for man and domestic animals

(c)

its gene pool will be lost forever

(d)

The population of beautiful animals like deers will get stabilized

20.

Xerophytes are mostly

(a)

succulents

(b)

water related

(c)

mesophytes

(d)

none of these

21.

Even in absence of pollinating agents, seed setting is assured in

(a)

Commelina

(b)

Zostera

(c)

Salvia

(d)

Fig

22.

scion grafted to a stock. The quality of fruits produced will be determined by the genotype of

(a)

Stock

(b)

Scion

(c)

Both stock and scion

(d)

Neither stock or scion

23.

Which one single organism or the pair of organisms is correctly assigned of its of their named taxonomic group

(a)

Paramecium and Plasmodium belong to the same kingdom as that of Penicillium

(b)

Lichen is a composite organism formed from the symbiotic association of an algae and a protozoan

(c)

yeast used in making bread and beer is a fungus

(d)

Nostoc and Anabaena are examples of protista

24.

Which one of the following is a case of wrong matching?

(a)

Somantic hybridization - Fusion of two diverse cells

(b)

Vector DNA-Site for t-RNA synthesis

(c)

Micropropagation - In vitro production of plants in large numbers

(d)

Callus - Unorganised mass of cell produced in tissue culture

25.

Consider the following four (1-4) statements about certain desert animals such as kangaroo rat
1. They have dark colour and high rate of reproduction and excrete solid urine.
2. They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
3. They feed on dry seeds and do not require drinking water.
4. They excrete very concentrated urine and do not use water to regulate body temperature.
Which of the above statements for such animals are true?

(a)

3 and 1

(b)

1 and 2

(c)

3 and 4

(d)

2 and 3

26.

Which of the following is a free living nitrogen fixing bacteria present in soil?

(a)

Azotobacter

(b)

Nitrosomonas

(c)

Rhizobium

(d)

Pseudomonas

27.

Keystone species deserve protection because these

(a)

are capable of surviving in harsh environmental conditions

(b)

indicate presence of certain minerals in the soil

(c)

have become rare due to overexploitation

(d)

play an important role in supporting other species.

28.

The figure below shows three steps (A, B, C) of polymerase Chain Reaction (PCR). Select the option giving correct identification together with what it represents?

(a)

B-denaturation at a temperature of about 98\(^{o}\)C separating the two DNA strands

(b)

A-denaturation at a temperature of about 50\(^{o}\)C

(c)

C-extension in the presence of heat stable DNA polymerase

(d)

A-annealing with two sets of primers

29.

Which one of the following symbols and its representation, used in human pedigree analysis is correct.

(a)

(b)

(c)

(d)

30.

Annual migration does not occur in case of

(a)

arctic tern

(b)

salmon

(c)

Siberian crane

(d)

salamander

31.

Agarose extracted from sea weeds is used in

(a)

spectrophotometry

(b)

tissue culture

(c)

PCR

(d)

gel electrophoresis

32.

In RNAi, genes are silenced using:

(a)

aa DNA

(b)

ds DNA

(c)

ds RNA

(d)

ss RNA

33.

DNA gyrase, the enzyme that participates in the process of DNA replication, is a type of

(a)

DNA ligase

(b)

DNA polymerase

(c)

DNA topiosomerase

(d)

Reverse transcriptase

34.

Mother and father of a person with 'O' blood group have "A" and 'B' blood group respectively. What would be the genotype of both mother and father?

(a)

Mother is homozygous for "A" blood group and father is heterozygous for 'B'

(b)

Mother is heterozygous for 'A' blood group and father is homozygous for 'B'

(c)

Both mother and father are heterozygous for 'A' and 'B' blood group, respectively

(d)

Both mother and father are homozygous for "A" and 'B' blood group, respectively

35.

Rejection of tissue or organ transplants is brought about mainly by

(a)

Cytotoxic T cells

(b)

NK cells

(c)

Suppressor T cells

(d)

B cells

36.

Choose the mismatched option

(a)

Wind - Cannabis: Anemophily

(b)

Water - Zostera: Hydrophily

(c)

Insects - Salvia: Entomophily

(d)

Birds - Adansonia: Ornithophily

(e)

Bats - Kigelia: Chiropterophily

37.

Match List I with List II and select the correct option

List I	List II
Bacillus thuringiensis	Production of chitinases
Rhizobium meliloti	Scavenging of oil spills
Escherichia coli	Incorporation of 'nif' gene
Pseudomonas putida	production of Bt toxin
Trichoderma	Productiion of human insulin

(a)

a-2,b-4,c-1,d-5,e-3

(b)

a-2,b-4,c-5,d-1,e-3

(c)

a-4,b-3,c-5,d-2,e-1

(d)

a-3,b-4,c-5,d-1,e-2

(e)

a-4,b-2,c-5,d-3,e-1

38.

Lysine and tryptophan are :

(a)

proteins

(b)

non-essential amino acids

(c)

essential amino acids

(d)

aromatic and no acids

39.

The common nitrogen fixer in paddy fields is

(a)

Frankia

(b)

Rhizobium

(c)

Azospirillum

(d)

Oscillatoria

40.

The cancer of the epithelial cells is called

(a)

Leukemia

(b)

Lipoma

(c)

Sarcoma

(d)

Emphysema

(e)

Carcinoma

41.

Double fertilization is the process in plants that includes

(a)

Syngamy and triple fusion

(b)

only triple fusion

(c)

Development of antipodal cells

(d)

Name of the above

42.

Which of the following conditions is related to haemophilia

(a)

A recessive gene responsible present in the X chromosome

(b)

A dominant gene responsible present in the X chromosome

(c)

A responsible dominant gene present in the Y chromosome

(d)

A responsible dominant gene present in the autosomal chromosome

43.

Oral contraceptive pills helps in birth control by

(a)

killing sperms

(b)

killing ova

(c)

preventing ovulation

(d)

forming barrier between sperms and ova

44.

Which of the following is important for transcriptiom?

(a)

DNA methylase

(b)

CAAT box

(c)

Promoter

(d)

DNA polymerase

45.

Which of the following malarial parasites has the longest inculation period?

(a)

Plasmodium vivax

(b)

Plasmodium falciparum

(c)

Plasmodium ovale

(d)

Plasmodium malariae

46.

Choose the correct answer regarding the ZIFT procedure?

(a)

Ova collected from a female donor are transferred to the fallopian tube to facilitate zygote formation.

(b)

Zygote is collected from a female donor and transferred to the fallopian tube.

(c)

Zygote is collected from a female donor and transferred to the uterus

(d)

Ova collected from a female donor and transferred to the uterus

47.

In the hexaploid wheat, the haploid (n) and basic (x) number of chromosomes are

(a)

n=2 and x=21

(b)

n=21 and x=14

(c)

n=21 and x=7

(d)

n=7 and x=21

48.

Which of the following is dipteran?

(a)

Tobacco budworm

(b)

Armyworm

(c)

Beetle

(d)

Mosquito

49.

Out of 64 codons how many codons do not code for any amino acid?

(a)

(b)

(c)

(d)

50.

Which one of the following is not used as a biopesticide?

(a)

Trichoderma harzianum

(b)

Nuclear polyhedrosis virus (NPV)

(c)

Xanthomonas campestris

(d)

Bacillus thuringiensis

51.

Which of the following birth control measures can be considered as the safest?

(a)

the rhythm method

(b)

the use of physical barriers

(c)

termination of unwanted pregnancy

(d)

sterilization techniques

52.

The plant part which consists of two generations one within the other is

(a)

Germinated pollen grain

(b)

seed

(c)

Unfertilized ovule

(d)

Embryo

53.

Female heterogamy is found in

(a)

Birds

(b)

Grasshopper

(c)

Both a and b

(d)

Drosophila

54.

Insect resistance trangenic cotton has been produced by inserting a piece of DNA from

(a)

an insect

(b)

a bacterium

(c)

a wild relative of cotton

(d)

a virus

55.

Two microbes found to be very useful in genetic engineering are

(a)

Crown gall bacterium and Coenorhabdities elegans

(b)

Escherichia coli and Agrobacterium tumefaciens

(c)

Vibria cholerae and a tailed bacteriophage

(d)

Diplococcus sp. and Pseudomonas sp.

56.

Who gave the idea that every plant cell is totipotent

(a)

P.R White

(b)

E.C Cocking

(c)

F.C Staward

(d)

G.Haberlandt

57.

Which one of the following is not s secondary metabolite?

(a)

Resins

(b)

Essential oils

(c)

Amino acids

(d)

Tannins

58.

Which of the following statement is true of Hydra?

(a)

It produces asexual gemmules

(b)

It produces unicellular bud

(c)

It produces multicellular bud.

59.

Which of the following statements is true of yeast?

(a)

The cell divides by binary fission. One of them develops into a bud.

(b)

The cell divides unequally. The smaller cell develops into a bud.

(c)

The cell produces conidia, which develop into a bud.

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Answers Key:

Multiple Choice Question

59 x 1 = 59

(a)
A-4, B-1, C-2, D-3, E-5

(d)
turnip

(b)
make cuts at specific positions within the DNA molecule

(b)
Endometrium regenerates: 5-10 days

(d)
phosphorus

(a)
Hepatitis-B

10.

11.

(b)
5' - CAU -3'

12.

13.

(d)
8%

14.

15.

16.

(d)
ozone

17.

18.

(b)
29th December

19.

20.

(a)
succulents

21.

(a)
Commelina

22.

(b)
Scion

23.

24.

(b)
Vector DNA-Site for t-RNA synthesis

25.

26.

(a)
Azotobacter

27.

(d)
play an important role in supporting other species.

28.

(a)
B-denaturation at a temperature of about 98\(^{o}\)C separating the two DNA strands

29.

30.

(d)
salamander

31.

(d)
gel electrophoresis

32.

33.

(d)
Reverse transcriptase

34.

35.

(a)
Cytotoxic T cells

36.

(d)
Birds - Adansonia: Ornithophily

37.

38.

39.

40.

(e)
Carcinoma

41.

(a)
Syngamy and triple fusion

42.

(a)
A recessive gene responsible present in the X chromosome

43.

44.

45.

(d)
Plasmodium malariae

46.

(b)
Zygote is collected from a female donor and transferred to the fallopian tube.

47.

48.

(d)
Mosquito

49.

50.

51.

(d)
sterilization techniques

52.

(b)
seed

53.

Birds

54.

(b)
a bacterium

55.

(b)
Escherichia coli and Agrobacterium tumefaciens

56.

(a)
P.R White

57.

58.

59.

(b)
The cell divides unequally. The smaller cell develops into a bud.

CBSE 12th Standard Biology Ecosystem HOT Questions Study Material - QB365 Set D

QB365 Student Learing Managemnet System

Std: 12th Standard CBSE - Biology

chapter: Ecosystem - HOT Questions

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