NEET Biology Previous year MCQ Bank With Answer Key - 06

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