91. Which of the following is a bacterial disease
(1) measles (2) rabies
(3) small Pox (4) tuberculusis
92. Antibiotics arc t}lost}y obtained from
(1) bncteria (2) angiosperms
(3) viruses (4) fungi
93. Antibiotics cure disease by
(1) removing Pain
(2) competitive inhibition
(3) fighting with the disease causing organism
(4) turning the pathogen out of the body
94. A compound which is produced by an organism and inhibits the growth of other organism is called
(1) antiseptics (2) antibiotic (3) anticoagulant (4) antiallergic
95. A free living bacterium capable of fixing atmospheric nitrogen is
(1) Staphylococcus (2) Azotobacter
(3) Streptococcus (4) Rhizopus
96. Bacteria which are smallest in size ore
(1) vibrio (2) spirilli
(3) cocci (4) bacilli
97. Bacteria that are responsible for fermentation of dairy milk and plant products
(1) Chlorobium (2) Rhizobium
(3) Lactobacillus (4) Acetobacter
98. Antibiotics are
(1) plants (2) syrups
(3) drugs (4) toxins
99. We can keep food for longer duration in cold storage than in ordinary cup-board because
(1) insects cannot cause infection
(2) low temperature causes plasmolysis
(3) bacterial multiplication is greatly reduced
(4) bacterial multiplication is completely prevented
100. The hydrogen donor in bacterial photosynthesis is usually
(1) water (2) sulphurous acid
(3) hydrogen sulphide (4) ammonia
101. Scientist who first saw microbes (bacteria, protozoa etc.) was
(1) Louis Pasteur
(2) Edward Jenner
(3) Alexander Flemming
(4) Anton Von Leeuwenhoek
102. Chemosynthetic bacteria are those bacteria
(1) which synthesize food without light
(2) which carry out synthesis in light
(3) which do not carry out photosynthesis
(4) which are unable to carry out chemical reactions
103. Bacteria which directly convert atmospheric nitrogen into nitrogen compound are called
(1) putrifying bacteria (2) nitrifying bacteria
(3) denitrifying bacteria (4) nitrogen fixing bacteria
104. Bacterial cell wall is composed of
(1) cellulose (2) lignin
(3) chitin (4) mucopeptidc
105. In bacteria the nuclear material is
(1) nucleic acid only (2) nucleic acid and cytoplasm
(3) nucleic acid and histone protein (4) all the above
106. Which one of the following fixes CO2 in to carbohydrates
(1) Rhizobium (2) Bacillus
(3) Azotobacter (4) Rhodospirillum
107. Waksman got the noble prize for the discovery of
(1) penicillin (2) streptomycin
(3) Chloromycetin (4) neomycin
108. If a bacterium cell divides in every 20 minutes , how many bacteria will be formed in two hours
(1) 4 (2) 16
(3) 8 (4) 64
109. Plasmids are
(1) viruses
(2) genetic elements of bacteria
(3) new type of microorganisms
(4) extra chromosomal genetic elements of bacteria
110. Bacteria bearing flagella all over the body are called .
(1) atrichous (2) cephalodichous
(3) peritrichous (4) itionorrichous
111. Bacteria are plants because they have
(1) rigid cell wall
(2) ability to synthesize vitamins
(3) both the above
(4) none, of the above
112. Honey, jams, jelly and chatney are free of bacteria because
(1) bacterial cells are plasmolysed in these substrates
(2) these substrates are poisonous
(3) these substrates have a fowl smell
(4) these substrates have complex substances which cannot be Utilized by bacteria for their nutrition
113. Gram positive bacteria have
(1) thick and homogeneous cell wall
(2) as much as 70% peptidoglycan
(3) either no lipids or less than 10% lipids
(4) all the above
114. Which of the following is a symbiotic nitrogen fixing prokaryote
(1) Spirulina (2) Nitrosomonas
(3) Nitrobacter (4) Anabaena
115. Which of the following structures helps in nitrogen fixation
(1) hormogonia (2) akinetes
(3) heterocysts (4) trichome
116. Good yield of rice can be obtained for many years without adding any nitrogenous manure to the fields. This is due to
(1) rice plants do not require any nitrogen
(2) rice plants require very little of nitrogen
(3) roots of rice plants have nitrogen fixing bacteria
(4) rice fields generally have nitrogen fixing blue-green algae
117. The following is an aerobic, free-living nitrogen fixing bacteria found in the soil
(1) Klebsiella (2) Rhizobium
(3) Clostridium (4) Azotobacter
118. In E. coli there is no alternation of generation because
(1) its cells do not exchange genetic material with each other
(2) there is neither syngamy nor reduction division
(3) it does not have chromosomes
(4) the chromosomes do not fuse
119. Nitrosomonas is a
(1) chemoautotroph (2) photoautotroph
(3) photoheterotroph (4) chemoheterotroph
120. An antibiotic streptomycin is produced by
(1) Streptomyces grisnus (2) Stre, nomyces scoleus
Attachment:- PCB Q.rar