Question Set D

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

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Questions:

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.

Which of the following statement is true of Hydra?

(a)

It produces asexual gemmules

(b)

It produces unicellular bud

(c)

It produces multicellular bud.

Which one of the following is not s secondary metabolite?

(a)

Resins

(b)

Essential oils

(c)

Amino acids

(d)

Tannins

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

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.

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

Female heterogamy is found in

(a)

Birds

(b)

Grasshopper

(c)

Both a and b

(d)

Drosophila

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

(a)

Germinated pollen grain

(b)

seed

(c)

Unfertilized ovule

(d)

Embryo

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

10.

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

11.

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

(a)

(b)

(c)

(d)

12.

Which of the following is dipteran?

(a)

Tobacco budworm

(b)

Armyworm

(c)

Beetle

(d)

Mosquito

13.

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

14.

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

15.

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

(a)

Plasmodium vivax

(b)

Plasmodium falciparum

(c)

Plasmodium ovale

(d)

Plasmodium malariae

16.

Which of the following is important for transcriptiom?

(a)

DNA methylase

(b)

CAAT box

(c)

Promoter

(d)

DNA polymerase

17.

Oral contraceptive pills helps in birth control by

(a)

killing sperms

(b)

killing ova

(c)

preventing ovulation

(d)

forming barrier between sperms and ova

18.

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

19.

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

20.

The cancer of the epithelial cells is called

(a)

Leukemia

(b)

Lipoma

(c)

Sarcoma

(d)

Emphysema

(e)

Carcinoma

21.

The common nitrogen fixer in paddy fields is

(a)

Frankia

(b)

Rhizobium

(c)

Azospirillum

(d)

Oscillatoria

22.

Lysine and tryptophan are :

(a)

proteins

(b)

non-essential amino acids

(c)

essential amino acids

(d)

aromatic and no acids

23.

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

24.

Choose the mismatched option

(a)

Wind - Cannabis: Anemophily

(b)

Water - Zostera: Hydrophily

(c)

Insects - Salvia: Entomophily

(d)

Birds - Adansonia: Ornithophily

(e)

Bats - Kigelia: Chiropterophily

25.

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

26.

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

27.

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

28.

In RNAi, genes are silenced using:

(a)

aa DNA

(b)

ds DNA

(c)

ds RNA

(d)

ss RNA

29.

Agarose extracted from sea weeds is used in

(a)

spectrophotometry

(b)

tissue culture

(c)

PCR

(d)

gel electrophoresis

30.

Annual migration does not occur in case of

(a)

arctic tern

(b)

salmon

(c)

Siberian crane

(d)

salamander

31.

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

(a)

(b)

(c)

(d)

32.

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

33.

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.

34.

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

(a)

Azotobacter

(b)

Nitrosomonas

(c)

Rhizobium

(d)

Pseudomonas

35.

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

36.

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

37.

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

38.

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

39.

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

(a)

Commelina

(b)

Zostera

(c)

Salvia

(d)

Fig

40.

Xerophytes are mostly

(a)

succulents

(b)

water related

(c)

mesophytes

(d)

none of these

41.

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

42.

The world biodiversity day is celebrated annually on

(a)

5th June

(b)

29th December

(c)

22nd April

(d)

16th September

43.

Term ecosystem was given by

(a)

Odum

(b)

Haeckel

(c)

Tansley

(d)

Mobius and Forbes

44.

Ultra violet radiations from sunlight causes a reaction that produces

(a)

fluorides

(b)

carbon monoxide

(c)

sulphur dioxide

(d)

ozone

45.

Which of the ecological pyramid is always straight?

(a)

pyramid of numbers

(b)

pyramid of biomass

(c)

pyramid of energy

(d)

none of these

46.

The final stable community in ecological succession is

(a)

pioneers

(b)

sere

(c)

climax

(d)

carnivores

47.

India's share in the global species diversity is about

(a)

(b)

(c)

(d)

48.

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

49.

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'

50.

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

51.

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

(a)

Hepatitis-B

(b)

Jaundice

(c)

Cholera

(d)

Typhoid

52.

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

53.

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

54.

The embryo at 16 celled stage is known as

(a)

morula

(b)

gastrula

(c)

blastula

(d)

blastomere

55.

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

56.

SWan-necked flask experiment was done by

(a)

Aristotle

(b)

Francisco Redi

(c)

Louis Pasteur

(d)

Robert Koch

57.

Cause of speciation is

(a)

Random mating

(b)

Hybridization

(c)

Isolation

(d)

Migration

58.

Sweet potato is homologous to

(a)

potato

(b)

colocasia

(c)

ginger

(d)

turnip

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

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Answers Key:

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

(a)
P.R White

(b)
Escherichia coli and Agrobacterium tumefaciens

(b)
a bacterium

Birds

(b)
seed

(d)
sterilization techniques

10.

11.

12.

(d)
Mosquito

13.

14.

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

15.

(d)
Plasmodium malariae

16.

17.

18.

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

19.

(a)
Syngamy and triple fusion

20.

(e)
Carcinoma

21.

22.

23.

24.

(d)
Birds - Adansonia: Ornithophily

25.

(a)
Cytotoxic T cells

26.

27.

(d)
Reverse transcriptase

28.

29.

(d)
gel electrophoresis

30.

(d)
salamander

31.

32.

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

33.

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

34.

(a)
Azotobacter

35.

36.

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

37.

38.

(b)
Scion

39.

(a)
Commelina

40.

(a)
succulents

41.

42.

(b)
29th December

43.

44.

(d)
ozone

45.

46.

47.

(d)
8%

48.

49.

(b)
5' - CAU -3'

50.

51.

(a)
Hepatitis-B

52.

(d)
phosphorus

53.

(b)
Endometrium regenerates: 5-10 days

54.

55.

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

56.

57.

58.

(d)
turnip

59.

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

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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Questions:

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Answers Key:

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