Select one which is correct reply to the statement Sr. No

Select one which is correct reply to the statement

Sr. No. Statement Answer

1. Radiobiology is study of the effect of ........... on living

organisms

a. Mineral elements

b. Radioactivity

c. Toxic gases

d. Salts

2. Phycology is the study of -------------

a. Bacteria

b. Viruses

c. Algae

d. Fungi

3. Microscope was invented by

a. Anton van Leeuwenhoek

b. Louis Pasteur

c. Robert Koch

d. Edward Jenner

4. One of plants of the pairs produces spores while the other

produces seeds

a. Monocot and dicot

b. Algae and fungi

c. Mosses and ferns

d. Ferns and gymnosperms

5. Nodules fix nitrogen in the crops

a. Wheat and Rice

b. Sesbania and Mungbean

c. Maize and Barley

d. Cotton and Sugarcane

6. -------- are mineral form of nitrogen

a. Amino acid

b. Proteins

c. Nitrates

d. Nitrogen gas

7. ------- are the major nutrient elements for plants

a. NPK

b. ZnNaCl

c. BNaS

d. CoNiS

8. The soil water in plants is taken up and distributed by

a. Stomata

b. Chloroplasts

c. Xylem

d. Phloem

9. Gymnosperms are

a. Naked seed plants

b. Flowering plants

c. Grasses

d. Cereals

10. Molecular Biology deals with the study of

a. Periodic table

b. Nucleic acids

c. Bacteria

d. Viruses

11. The soluble salts of a solution are measured by

a. pH meter,

b. spectrophotometer

c. EC meter,

d. Oxygen meter

12. One mole of the solute dissolved per liter is

a. Molar solution

b. Molal Solution

c. Normal solution

d. Neutral solution

13. Prominent difference between prokaryotes and eukaryotes cell

is -----------

a. Larger size of prokaryotes

b. Lack of pigmentation in eukaryotes

c. Presence of a nucleus in eukaryotes

d. Presence of cell wall in prokaryotes

14. One prokaryote whereas the other is eukaryote

a. Algae & fungi

b. Mosses and ferns

c. Ferns and gymnosperms

d. Cyanobacteria & algae

15. Abio-genesis is ------------

a. Germ theory of disease

b. Spontaneous generation of organisms from non-living

matter

c. Development of life from preexisting life forms

d. Development of aseptic techniques

16. DNA is hereditary molecule composed of -----------

a. Deoxyribose, phosphate and nitrogen bases

b. Deoxyribose, a pentose and nucleic acid

c. Sugar, proteins and thymine

d. Adenine, phosphate and ribose

17. Fusion of two haploid cells results in------

a. A germ cell

b. A diploid zygote

c. Mitosis

d. Meiosis

18. Tonoplast membrane is ------

a. The border between protoplasm and vacuole

b. The outer membrane of nucleus

c. Membrane of Golgi bodies

d. Cellulose membrane

19. Fluid mosaic model describes -----------------

a. The structure of cells

b. Structure of tobacco virus

c. The lipid bi-layer structure of membranes

d. None of the above

20. Louis Pasteur discovered ---------

a. Structure of tartaric acid

b. Pasteurization of milk and wine

c. Anthrax vaccine

d. All of these

21. Koch contributed to the medical microbiology by -------

a. Discovering causative agents of anthrax, cholera,

tuberculosis

b. Establishing Koch’s postulates

c. Developing techniques for microbiology

d. All of these

22. Which of the following is not found in bacterial cells ------

a. Cell membrane

b. A nucleoid

c. Ribosomes

d. Capsule

23. The nutrients essential for the growth of bones are ------

a. Carbohydrates

b. Proteins

c. Fats

d. Minerals

24. The substances animal and human bodies produce to fight

against disease causing agents and germs are -------

a. Vaccines

b. Viruses

c. Antibodies

d. Serums

25. ------------- are the chemical substances produced by ductless

glands

a. Vitamins

b. Hormones

c. Fats

d. Carbohydrates

26. The insect legs and the wings are attached to the -------- part of

the insect body

a. Abdomen

b. Head

c. Thorax

d. Tail

27. Entomology the study of insects constitute a major group of ----

----------- animals

a. Vertebrate

b. Invertebrate

c. Sponge

d. Marines

28. Fish breath through ------------

a. Lungs

b. Gills

c. Skin

d. Nasal

29. Transduction is the process of bacterial ----------

a. Transformation of genetic material

b. Uptake of naked DNA

c. Transfer of genetic material by viruses

d. Unit of DNA

30. A virus is a tiny infectious ---------

a. Cell

b. Living thing

c. Particle

d. Nucleic acid

31. Viruses are known to infect -----------

a. Plants

b. Fungi

c. Bacteria

d. All organisms

32. The nucleic acid of virus is -----------

a. DNA only

b. RNA only

c. Both DNA and RNA

d. Either DNA or RNA

33. Coliphages are the viruses which infect the ----------

a. Animals

b. Plants

c. Protozoa

d. Gut bacteria

34. Phycology is the study of

a. Bacteria

b. Viruses

c. Algae

d. Fungi

35. Flagella and cilia both are found in -----------

a. Algae

b. Multicellular animals

c. Protozoa

d. Fungi

36. Fungi may be divided into two groups pathogenic or -----

a. Photosynthetic

b. sympathetic

c. Saprophytic

d. a & b

37. Yeast plants reproduce by -----------

a. Regeneration

b. Budding

c. Spores

d. Eggs

38. All algae have some types of

a. Spore

b. Chlorophyll

c. Locomotor organelle

d. Toxin

39. A hyphae divided into compartments walls is called -------

a. Non-septate

b. Imperfect

c. Perfect

d. Septate

40. Reproduction by fission occurs in -------------

a. Yeasts

b. Moulds

c. Bacteria

d. Viruses

41. Catabolism is a form of metabolism in which---------molecules

are converted into-------- molecules

a. Large, small

b. Small, large

c. Amino acids, proteins

d. Food, storage

42. A compound synthesize by bacteria or fungi that destroys or

inhibits growth of other microbes a/an ---------

a. Synthetic drug

b. Antibiotic

c. Antimicrobial drug

d. Competitive inhibitor

43. Bioremediation is a microbial process of ---------

a. Biodegradation of organic molecules

b. Detoxification of toxic heavy metals

c. Transformation of inorganic chemicals

d. All of three

44. An organism that can synthesize all its required organic

compounds from CO2 using energy from sun is a ---------

a. Photoautotroph

b. Photoheterotroph

c. Chemoautotroph

d. Chemoheterotroph

45. The flowering plants with their seeds enclosed in an ovary are

called -----------

a. Angiosperms

b. Gymnosperms

c. Bryophytes

d. Ptredophytes

46. Gymnosperm are the plants with ---------

a. Enclosed reproductive part

b. Vessel less vascular bundles

c. Naked flower

d. b & c

47. The part of flower bearing male reproductive organs is ----

a. Calyx

b. Corrola

c. Gynoecium

d. Androecium

48. One produces fruits other does not

a. Cyanobacteria & algae

b. Algae & fungi

c. Mosses and ferns

d. Gymnosperms and angiosperms

49. Products of glycolysis are -------

a. ATP

b. H2O

c. CO2

d. Both a and b

50. The theory of evolution based on study of the structures that

appears during the development of different organisms is called

a. Natural selection

b. Comparative anatomy

c. Comparative embryology

d. Molecular biology

51. Complete oxidation of glucose in aerobic respiration yields a

net --------- ATPs

a. 40

b. 38

c. 6

d. 2

52. The compound that enters the TCA cycle from glycolysis is __

a. Citric acid

b. Pyruvic acid

c. Acetyl CoA

d. Oxaloacetic acid

53. Which of the following is considered a greenhouse gas ---

a. CO2

b. N2O

c. CH4

d. All of these

54. The Calvin cycle operates during which part of photosynthesis-

a. Only the light reaction

b. Only the dark reaction

c. Both light and dark reactions

d. Only photosystem I

55. Root nodules contain ------ which can ---------

a. Azotobacter, fix N2

b. Rhizobia, fix N2

c. Bacillus, denitrify NO3

d. Nitrosomonas, nitrify NH3

56. Photosynthesis is the process of conversion of sun light energy

into -----

a. Organic matter

b. Chemical energy

c. Inorganic elements

d. Hydro energy

57. The free energy per unit volume of water in a solution is --

a. Water potential

b. Osmotic potential

c. Matric potential

d. Pressure potential

58. Water always moves freely from -----------

a. From lower water potential to higher

b. From higher water potential to lower

c. From solution to solvent

d. From solute to solution

59. ETS, the electron transport system is operated on ----------

a. Chloroplast membranes

b. Mitochondrial membrane

c. Golgi apparatus

d. Endoplasmic Reticulum

60. An exorgonic reaction is ----------

a. Energy yielding reaction

b. Energy absorption reaction

c. A neutral reaction

d. Heat consuming reaction

61. Phytohormones are ------------

a. Plant growth regulators

b. Enzymes

c. Toxins

d. Inorganic chemicals

62. Bacillus thuringiensis, Bt is a -------------

a. Bio-pesticide

b. Herbicide

c. Organic compound

d. Xenobiotic

63. ABA, abscisic acid is a -------------

a. Wilting temperature

b. Stress phyto-hormone

c. A plant enzyme

d. An inorganic chemical

64. The water and nutrients conducting tissue in plants are ---

a. Phloem

b. Guard cells

c. Stomata

d. Xylem

65. IAA produces in the plant part --------

a. Roots hairs

b. Older leaves

c. Fruiting buds

d. Shoot apex

66. Phototropism is the growth movement of the plant stimulated

by -------------

a. Darkness

b. Sun light

c. Temperature

d. Heat

67. Halophytes plants require --------- in the medium for growth

a. Sugars

b. Acidic condition

c. Salts

d. Nutrient deficiency

68. Water use efficiency is the plant biomass -----------

a. Consumed per mole of N use

b. Produced per mole of water uptake

c. Produced per mole of carbon uptake

d. Accumulated by foliar parts

69. ELISA is an ---------------

a. Enzyme Less Immune Stability Analysis

b. Enzyme linked Immunosorbent Assay

c. El Nino of South African Ocean

d. Elimination of Intrinsic Salts

70. Nitrate reductase is an ------ which converts NO3 into nitrite

a. Enzyme

b. Drug

c. Antibiotic

d. Antioxidant

71. One plant of the following pairs contains xylem and phloem,

whereas the other does not

a. Gymnosperms and angiosperms

a. Algae and fungi

b. Mosses and ferns

c. Ferns and gymnosperms

72. Cacti are ------- plants

a. Halophytic

b. Glycophytic

c. Hydrophytic

d. Xerophytic

73. Osmosis is the movement of water through ----------

a. Cell walls

b. Plasmodesmata

c. Permeable membranes

d. Soil aggregates

74. The ratio of sand, silt and clay of a soil sample indicates--

a. Soil structure

b. Soil texture

c. Soil organic matter

d. Soil porosity

75. GMOs are the organisms ----

a. Chemically produced

b. Physically modified

c. Genetically altered

d. a & b

76. Hybrid plants and animals are generally -------

a. Weak

b. Vigorous

c. Unhealthy

d. Accidental

77. Citrus fruits and tomatoes are rich in vitamin -----

a. A

b. B

c. C

d. D

78. The element taken up from air by legume plants is ------

a. Nitrogen

b. Potassium

c. Hydrogen

d. Phosphorus

79. The process that allows the higher plants to be autotroph

a. Protein synthesis

b. Digestion

c. Respiration

d. Photosynthesis

80. Sudden and accidental appearance of a new trait in a plant or

animal is called ---------

a. Freak

b. In-breading

c. Hybridization

d. Mutation

81. --------- are the Rabi crops

a. Wheat and Rice

b. Wheat and Mustard

c. Rice and Cotton

d. Cotton and Mustard

82. Ammonia is a compound of ------------ and hydrogen

a. Oxygen

b. Phosphorus

c. Carbon

d. Nitrogen

83. Science which deals with the study of heredity is called ---

a. Genetics

b. Entomology

c. Physiology

d. Otomology

84. One produce seeds other does not ______


b. Algae & fungi

c. Mosses and ferns

d. Ferns and gymnosperms

85. A substance which alters the speed of a chemical reaction is a--

a. Molecule

b. Element

c. Catalyst

d. Compound

86. Starch is digested by -----------

a. Ptyalin

b. Bile

c. Insulin

d. Phosphates

87. The forms of an element differencing in atomic number but

similar in atomic mass are ---------

a. Isotopes

b. Cations

c. Isobars

d. Anions

88. Diamond and graphite are allotropic forms of -----------

a. Fe

b. S

c. Zn

d. C

89. Structure found in plant cells but not in animal cells

a. Nucleus

b. Chloroplast

c. Mitochondria

d. Endoplasmic reticulum

90. Hydrated aluminium Al2Si2O5 (OH)4 is called ----------

a. Feldspar

b. Plaster of paris

c. Gypsum

d. China clay

91. Removal of Oxygen from a chemical process is ----------

a. Reduction

b. Digestion

c. Oxidation


92. The soil formed by decay of living things is -------------

a. Clay

b. Silt

c. Sand

d. Humus

93. Malachite is an ore of -------------

a. Mn

b. Zn

c. Cu

d. Fe and sulpher

94. Deuterium and Tritium are isotopes of -------------

a. P

b. N

c. C

d. H

95. X-rays are the forms of ------------ radiations

a. UV

b. Ionizing

c. Electromagnetic

d. All of them

96. ------- is a liquid metal

a. Tangston

b. Argon

c. Nitrogen

d. Mercury

97. Ananbolism is a form of metabolism in which---------molecules

are converted into-------- molecules

a. Large, small

b. Small, large

c. Amino acids, proteins

d. Food, storage

98. The process that leads to the production of ethyl alcohol or

lactic acid

a. Phosphorylation

b. Digestion

c. Respiration

d. Fermentation

99. Fermentation of a glucose molecule gives off a net number of --

------ ATPs

a. 4

b. 2

c. 40

d. 0

100. ARA is acetylene reductase assay which is used for

determining extent of ----------

a. Biological N fixation

b. Phosphorus availability

c. CO2 fixation

d. N mineralization

101. Humin is the recalcitrant fraction of ------------

a. Humic acid

b. Humus

c. Fulvic acid

d. Soil carbohydrates

102. The alkali extractable fraction of the humic compounds is

a. Fulvic acid

b. Humic acid

c. Humin

d. All three

103. An organism that can synthesize all its required organic

compounds from CO2 using energy from sun is a ---------

a. Photoautotroph

b. Photoheterotroph

c. Chemoautotroph

d. Chemoheterotroph

104. Structure that contains the codes for synthesis of specific

proteins produced by the cell ----------

a. Ribosomes

b. Nucleus

c. Chloroplast

d. Endoplasmic reticulum

105. The process by which both plants and animal cells obtain

energy for cellular functions

a. Digestion

b. Respiration

c. Photosynthesis

d. Fermentation

106. Which of the groups below represent the correct relationship in

order from smallest to largest _____

a. Matter- element-compound-atom-electron

b. Electron-element-atom-compound-matter

c. Element-atom- electron –matter-compound

d. Compound-electron-element-atom- -matter

107. A human cell that contains 22 autosome and a Y chromosome

must be a

a. Zygote

b. A somatic cell of female

c. A sperm cell

d. An egg cell

108. One has vascular tissue whereas other does not

a. Ferns and gymnosperms

b. Cyanobacteria & algae

c. Algae & fungi

d. Mosses and ferns

109. The organ systems that forms a communication and

coordination network throughout all parts of animal body is

known as _______

a. Digestive system

b. Respiratory system

c. Circulatory system

d. Nervous system

110. The organ system that functions in exchanging gases with the

environment is known as

a. Respiratory

b. circulatory system

c. Endocrine system

d. Nervous system

111. Which structure develop in to seed after fertilization has

occurred _______

a. Cotyledon

b. Ovule

c. Overt

d. Endosperm

112. The system that takes in food, breakdown it in to smaller

chemical units and absorbs the nutrient molecules is known as--

a. Circulatory

b. Endocrine

c. Digestive

d. Respiratory

113. One photosynthesizes whereas other does not

a. Ferns and gymnosperms ______

b. Cyanobacteria & algae

c. Algae & fungi

d. Mosses and ferns

114. One produces naked seeds whereas other produces seeds

enclosed in maternally derived tissue ______


b. Algae & fungi

c. Mosses and ferns


115. The plant cells Responsible for secondary growth in plants---_

a. Xylem

b. Phloem,

c. Vascular cambium

d. Mesophyll

116. The plant tissue responsible for conducting water and minerals

throughout the plant _____

a. Vascular cambium

b. Mesophyll

c. Xylem

d. Pith

117. Transporting food synthesize during photosynthesis throughout

the plant body ________

a. Phloem

b. Vascular cambium

c. Mesophyll

d. Pith

118. Structure develop in to fruit once fertilization has occurred

a. Integumentary

b. Cotyledon

c. Overt

d. Endosperm

119. The theory of evolution based on study of local, regional and

global distribution of species is ______


b. Comparative embryology

c. Molecular biology

d. Biogeography

120. Study of the genetic makeup of the species at the DNA level is

known as ---


b. Comparative embryology

c. Molecular biology

d. Biogeography

121. A tetralpoid organism would have ----

a. One copy of each

b. Two copies

c. Four copies of each chromosome

d. Two copies of a single

122. Which of the following organisms is not considered as primary

producer-----

a. Phytoplankton

b. Algae

c. Fungi

d. Cyanobacteria

123. The two fundamental processes that govern

the dynamics of an ecosystem are---

a. Solar radiation and the carbon cycle

b. Photosynthesis and respiration

c. Energy flow and chemical/nutrient cycling

d. Nitrogen and the phosphorous cycles

124. A cooperative unit of many cells with

similar form and function is known as a(n)-----

a. Tissue

b. Organ system

c. Organ

d. Cell system

125. One of plants among the following pairs is photosynthetic

while other is Saprophytic _______


e. Algae and fungi

f. Mosses and ferns

g. Ferns and gymnosperms

126. The plant tissue responsible for primary growth (growth in

length) of the plant body ______

a. Vascular cambium

b. Ground tissue

c. Apical meristem

d. Xylem

127. The plant organs responsible for the movement of sugars

made in the leaves downward through the plant _____

a. Vascular cambium

b. Ground tissue

c. Apical meristem

d. Phloem

128. The primary building blocks of a DNA molecule are ___

a. Nitrogenous bases, phosphates, and ribose sugar

b. Nitrogenous bases, phosphates, and deoxyribose sugar

c. Phosphorous bases, nitrogen, and ribose sugar

d. Phosphorous bases, nitrogen, and deoxyribose sugar

129. The cell wall is found in which Eukaryotes _____

a. Fungi

b. Algae

c. Protozoa

d. a & b

130. Ecology deals with the study of _____

a. Living beings

b. Living and non living components

c. Reciprocal relationship between living and non living

components

d. Environment

131. Autoecology deals with _____

a. Ecology of species

b. Ecology of many species

c. Ecology of community

d. All the above

132. Synecology deals with ______

a. Ecology of many species

b. Ecology of many populations

c. Ecology of community


133. Ecotype is a type of species in which environmentally induced

variations are ______

a. Temporary

b. Genetically fixed

c. Genetically not related


134. The pyramid of energy flow in any ecosystem is _____

a. Always upright

b. May be upright or invented

c. Always inverted


135. An ecosystem must have continuous external source of

a. Minerals

b. Energy

c. Food

d. All of the above

136. The source of energy for an ecosystem is ______

a. ATP

b. Sunlight

c. D.N.A

d. R.N.A

137. Trophic levels are formed by ____

a. Only plants

b. Only animals

c. Only carnivorous

d. Organisms linked in food chain

138. Biotic potential is counteracted by ____

a. Competition with other organisms

b. Producer is the largest

c. Limitation of food supply


139. Definition of ecosystem is ____

a. The community of organisms together with the

environment in which they live

b. The abiotic component of a habitat

c. The part of the earth and its atmosphere which inhibits

living organisms

d. A community of organisms interacting with one another

140. In a food chain of grassland ecosystem the top consumers are

_____

a. Herbivorous

b. Carnivorous

c. Bacteria

d. Either carnivorous or herbivorous

141. Paper chromotography is most often associated with the

separation of _____.

a. Nutritional elements

b. DNA

c. Proteins

d. Plant pigments

142. Which of the following is/are properties of water? ____

a. High specific heat

b. Strong ionic bonds

c. High freezing point

d. All of the above

143. Negatively charged particles that circle the nucleus of an atom

are called _____

a. Neutrons

b. Neutrinos

c. Electrons

d. Protons

144. A type of molecule not found in the membrane of an animal

cell is ______

a. Phospholipid

b. Protein

c. Cellulose

d. Cholesterol

145. Viruses are made of _____

a. A protein coat surrounding a nucleic acid

b. DNA, RNA, and a cell wall

c. A nucleic acid surrounding a protein coat

d. Protein surrounded by DNA

146. Which of the follow is not true of both chloroplasts and

mitochondria? ____

a. Use of the inner membrane for most of it's activity

b. Converts energy from one form to another

c. Uses an electron transport chain

d. Is an important part of the carbon cycle

147. The Law of Segregation defined by Mendel states _____

a. When sex cells form, the two alleles that determine a

trait will end up on different gametes

b. Only one of two alleles is expressed in a heterozygous

organism

c. The allele expressed is the dominant allele

d. Alleles of one trait do not affect the inheritance of

alleles on another chromosome

148. Which of the following is not a factor that effects the rate of

both photosynthesis and respiration in plants? ____

a. The concentration of NADP and FAD

b. The temperature

c. The structure of the plants

d. The availability of the different substrates

149. The process in which pollen grains are released from the

anthers is called: _____

a. Pollination

b. Fertilization

c. Blooming

d. Dispersal

150. Oxygen is given off in the: _____

a. Light reactions of photosynthesis

b. Dark reactions of photosynthesis

c. Krebs cycle

d. Reduction of NAD+ to NADH

151. Which of the following is not an abiotic factor? ____

a. Temperature

b. Rainfall

c. Soil quality

d. Bacteria

152. Which biogeochemical cycle plays the least part in

photosynthesis or cellular respiration? ____

a. Hydrogen Cycle

b. Phosphorous Cycle

c. Sulphur Cycle

d. Nitrogen Cycle

153. Genetic engineering has benefited agriculture in many ways.

Which of the following is not one of them? ___

a. Developing a bovine growth hormone to increase milk

production

b. Strains of crops have been developed to resist herbicides

c. The development of microorganisms to breakdown

toxic substances into harmless compounds

d. Genetically vaccinating plants against viral attack

154. The plant hormone responsible for fruit ripening is ____

a. Auxin.

b. Cytokinin.

c. Ethylene.

d. Gibberellin.

155. In flowering plants, sperm are produced by the ____

a. Ovary

b. Anther

c. Microsporangium

d. Generative nucleus

156. 5. Which of the following is not a type of plant stem? ____

a. Corm

b. Node

c. Rhizome

d. Tendril

157. Molecular technique PCR is meant for ---------

a. Profit to cast ratio

b. Polymerase chain reaction

c. Phosphorus to carbon ratio

d. Particulate carbon reaction

158. Which of the following is radially symmetrical and possesses

nematocysts?

a. Porifera

b. Coelenterates

c. Mollusca

d. Amphibians

159. Which of the following enzymes acts on protein?

a. Pepsin

b. Amylase

c. Maltase

d. sucrase

160. Endocrine glands

a. Secrete vitamins

b. Begin functioning in adolescence

c. Have ducts.

d. Have no ducts

161. Chemical digestion begins in the

a. Mouth.

b. Esophagus.

c. Stomach.

d. Gall bladder.

162. Lacking a digestive system, tapeworms live in the intestines of

their host is a type of relationship

a. Predator-prey

b. Commensalism

c. Mutualism

d. Parasitism

163. A cow produces milk daily after grazing in a large pasture

owned and maintained by the farmer the relationship is

a. Commensalism

b. Mutualism

c. Camouflage

d. Predator-prey

164. Which of the following organisms in the food chain has the

largest biomass?

a. Plants

b. Grasshopper

c. Mouse

d. Owl

165. Evidence validating the theory of evolution based on

Study of similarities and differences in body structures of

various species is known as

a. Biogeography

b. Natural selection

c. Comparative anatomy

d. Comparative embryology

166. The uptake of naked DNA from solution by

bacterial cells is known as

a. Transpiration

b. Translation

c. Transduction

d. Transformation

167. The conditions for sterilization in an autoclave are--

a. 110 °C for 25 minutes at 15 Ib/in2

b. 131°C for 15 minutes at 20 Ib/in2

c. 121°C for 15 minutes at 15 Ib/in2

d. 121°C for 10 minutes at 35 Ib/in2

168. Heat labile solutions such as serum and antibiotic solutions are

sterilized by --------------

a. Membrane filtration

b. HEPA filtration

c. Autoclave

d. Pasteurization

169. The time required for a cell to divide and its population to

double is called the ----------------

a. Counting time

b. Division time

c. Reproduction time

d. Generation time

170. The traditional methods of bacterial identification are based on -

----------------

a. Morphology of bacterial colony

b. Gram staining

c. Biochemical characteristics

d. All of the above

171. Transduction in bacteria was first reported by----------------

a. Zinger and Griffith, 1950

b. Zinger and Lederberg, 1952

c. Lederberg and Tatum, 1946

d. Griffith, 1928

172. Yeast are -------------- fungi a. Multicellular b. Bi-cellular c. Acellular d. Unicellular

173. Psychrophiles would be expected to grow ------------------- a) In hot springs b) On human body c) At low pH d) At refrigerated temperature

174. Heterotrophs acquire carbon from ------------- a) CO2 b) Organic compounds c) CH4 d) Carbonates

175. The mixed bacterial culture is purified to a single colony by ----

------- plate method

a. Streak

b. Pour

c. Spread

d. spot

176. Coliphages are the viruses which infect the ----------

a. Animals

b. Plants

c. Protozoa

d. Gut bacteria

177. A fertile agriculture soil may contain ------------ number of

bacteria per gram

a. 10-5

b. 10-3

c. 108

d. 10-7

178. Primary mode of action of UV radiation is to ---------

a. Produce supeoxide ions

b. Denature proteins

c. Make pyrimidine diamers

d. Break disulphide bonds

179. 60

Co is used as source of -------------------------- for sterilization

of biological materials

a. X-rays

b. Cathod rays

c. Gamma rays

d. UV rays

180. Ethylene oxide is a ----------- sterilizing agent

a. Alcoholic

b. Phenolic

c. Gaseous

d. Metallic

181. Denitrification is ------ process

a. Microaerophilic

b. Aerobic

c. Oxic

d. anoxic

182. The element taken up from air by legume plants is ------

a. Nitrogen

b. Potassium

c. Hydrogen

d. Phosphorus

183. Nitrate reductase is an ------ which converts NO3 into nitrite

a. Enzyme

b. Drug

c. Antibiotic

d. Antioxidant

184. Most bacteria produce by -------------

a. Sexual reproduction

b. Binary fission

c. Conjugation

d. Transformation

185. Viruses cannot be cultured in --------------

a. Tissue culture

b. Bird embryos

c. Live mammals

d. Tryptic soy agar

186. Substances given off by yeasts during fermentation are ---

a. Alcohol

b. Organic acids

c. Carbon dioxide

d. All of these

187. Yeast plants reproduce by -----------

a. Regeneration

b. Budding

c. Spores

d. Eggs

188. Which of the following is not a microorganism------------

a. Algae

b. Bacterium

c. Protozoan

d. Mushroom

189. Anthrax vaccine for animal disease was developed by -----

a. Loius Pasteur

b. Robert Hook

c. Edward Jenner

d. Josph Lister

190. First antibiotic Penicillin was discovered by ----------------

a. Jones Salk

b. Seleman Walksman

c. Alexander Fleming

d. R. Ross

191. A food maintenance temperature that generally will prevent

food poisoning is ------

a. Below 4 oC

b. Above 60 oC

c. Room temperature

d. Both a & b

192. Detergents are -----------------

a. High level germicides

b. Low level germicides

c. Excellent antiseptics

d. Sporicidal

193. An effective method of sterilizing heat sensitive liquid is ---

a. UV radiation

b. Exposure to ozone

c. Beta-propiolactone

d. Filtration

194. Milk is usually pasteurized by ------------

a. The high-temperature short-time method

b. Ultra-pasteurization

c. Batch method

d. Electric currents

195. Agar is a polysaccharide obtained from cell membrane of

a. Fungi

b. Red algae

c. Bacteria

d. Protozoa

196. Which infection would be categorized as a zoonosis spread by

animals --------

a. Anthrax

b. Gas gangrene

c. Diphtheria

d. Both a & b

197. Independent and one sided microbial interaction is called

a. Synergism

b. Commensalism

c. Symbiosis

d. Mutualism

198. The wastes generated from agriculture and industrial activities

are -------------------- wastes

a. Farm

b. Dairy

c. Domestic

d. Agro-industrial

Documents

Select one which is correct reply to the statement Sr. No