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168. Which one of the following pairs
correctly matches a hormone with a disease resulting from its deficiency
a) Insulin - Diabetes insipidus
b) Thyroxine - Tetany
c) Parathyroid hormone - Diabetes mellitus
d) Luteinizing hormone - Failure of ovulation
Ans:d
169. A major omponent of gobar gas is
a) Methane b) Ethane
c) Butane d) Ammonia
Ans:a
170. A free living nitrogen-fixing cyanobacterium
which can also form symbiotic association with the water fern Azolla is
a) Chlorella b) Nostoc
c) Anabaena d) Tolypothrix
Ans:c
171. In the ABO system of blood groups, if
both antigens are present but no antibody, the blood group of the individual would be
a) O b) AB
c) A d) B
Ans:b
172. Plant adapted to low light intensity have
a) Higher rate of
CO2 fixation than the sun plants
b) More extended root system
c) leaves modified to spines
d) larger photosynthetic unit size than the
sun plants
Ans:d
173. The Ti
plasmid, is often used for
making transgenic plants. This plasmid is found in
a) Rhizobium of the roots of
leguminous plants
b) Agrobacterium
c) Yeast as a 2  m plasmid
d) Azotobacter
Ans:b
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174. During replication of a
bacterial chromosome DNA synthesis starts from a replication origin site and
a) Is facilitated by telomerase
b) Moves in one direction of the site
c) Moves in bi-directional way
d) RNA primers are involved
Ans:c
175. In a plant, red fruit (R) is dominant
over yellow fruit (r) and tallness (T) is
dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is
rrtt,
a) 50% will be tall with red fruit
b) 75 % will be tall with red fruit
c) All the offspring will be tall with red fruit
d) 25 % will be tall with red fruit
Ans:a
176. After a mutation at a genetic locus
the character of an organism changes due to the change in
a) DNA replication
b) Protein synthesis pattern
c) RNA transcription pattern
d) Protein structure
Ans:d
177. According to
Oparin, which one of
the following was not present in the primitive atmosphere of the earth
a) Oxygen b) Hydrogen
c) Water vapour d) Methane
Ans:a
178. When
CO2 concentration in blood increases, breathing becomes
a) There is no effect on breathing
b) Slow and deep
c) Faster and deeper
d) Shallower and slow
Ans:c |
