101. White rust disease is caused by
(1) Phytophthora
(2) Claviceps
(3) Albugo candida
(4) Alternaria
102. The chemical compounds produced by
the host plants to protect themselves against fungal infection is
(1) phytoalexins
(2) phytotoxin
(3) hormone
(4) pathogen
103. Which of the following is not
correctly matched?
(1) covered smut of barley - Ustilago nuda
(2) root knot disease - Meloidogyne
javanica
(3) late blight of potato - Phytophthora
infestans
(4) smut of bajra - Tolysporium
penicillariae
104. The organism, used for alcoholic
fermentation, is
(1) Aspergillus
(2) Pseudomonas
(3) Saccharomyces
(4) Penicillium
105. Excretion in Amoeba occurs through
(1) plasma membrane
(2) lobopodia
(3) contractile vacuole
(4) uroid portion
106. Interferons are
(1) anticancer proteins
(2) antiviral proteins
(3) complex proteins
(4) antibacterial proteins
107. In bacterial chromosomes, the
nucleic acid polymers are
(1) of two types-DNA and RNA
(2) linear DNA molecule
(3) linear RNA molecule
(4) circular DNA molecule
108. Influenza virus has
(1) both DNA and RNA
(2) DNA
(3) only proteins and no nucleic acids.
(4) RNA
109. Sex factor in bacteria is
(1) RNA
(2) Chromosomal replicon
(3) Sex-pilus
(4) F-replicon
110. Azotobacter and Bacillus polymyxa
are the examples of
(1) ammonifying bacteria
(2) symbiotic nitrogen-fixers
(3) disease-causing bacteria
(4) non-symbiotic nitrogen-fixers
111. Which one of the following
statements about viruses is correct?
(1) Viruses are facultative parasites
(2) Viruses possess their own metabolic
system
(3) Viruses are readily killed by
antibiotics
(4) Viruses contain either DNA or RNA
112. The plasmids pesent in the
bacterial cells are
(1) linear double helical DNA molecules
(2) circular double helical DNA molecules
(3) linear double helical RNA molecules.
(4) circular double helical RNA
molecules
113. The hereditary material present in
the bacterium Escherichia coli is
(1) double stranded DNA
(2) single stranded DNA
(3) single stranded RNA
(4) deoxyribose sugar
114. Mycorrhiza is
(1) a fungus parasitising root system of
higher plants
(2) a symbiotic association of plant roots and certain fungi
(3) an association of Rhizobium with the
roots of lenguminous plants
(4) an association of algae with fungi
115. Which one of the following is not
true about lichens?
(1) Some species can be used as
pollution indicators
(2) Their body is composed of both algal
and fungal cells
(3) These grow very fast at the rate of about 2 cm per year
(4) Some form food for reindeers in
arctic regions
116. Transfer of genetic information
from one bacterium to another in the transduction process is through
(1) Another bacterium
(2) Conjugation
(3) Physical contact between donor and
recipient strain
(4) Bacteriophages released from the donor bacterial strain
117. A few organisms are known to grow
and multiply at temperatures of 100–105ºC. They belong to
(1) hot-spring blue-green algae
(cyanobacteria)
(2) marine archaebacteria
(3) thermophilic, subaerial fungi
(4) thermophilic sulphur bacteria
118. The main role of bacteria in the
carbon cycle involves
(1) digestion or breakdown of organic compounds
(2) photosynthesis
(3) assimilation of nitrogenous
compounds
(4) chemosynthesis
119. Two bacteria found to be very
useful in genetic engineering experiments are
(1) Rhizobium and Diplococcus
(2) Escherichia and Agrobacterium
(3) Nitrosomonas and Klebsiella
(4) Nitrobacter and Azotobacter
120. Most of the Lichens consist of
(1) red algae and ascomycetes
(2) blue-green algae and basidomycetes
(3) brown algae and phycomycetes
(4) blue-green algae and ascomycetes