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131. In a mutational event, when adenine
is replaced by guanine, it is a case of
a) Transcription b) Transition
c) Transversion
d) Frameshift mutation
Ans:b
132. Ovulation in the human female
normally takes place during the menstrual cycle
a) Just before the end of the secretory phase
b) At the beginning of the proliferative phase
c) At the end of the proliferative phase
d) At the mid secretory phase
Ans:c
133. Injury to vagus nerve in humans is not
likely to affect
a) Gastrointestinal movements
b) Pancreatic secretion
c) Cardiac movements
d) Tongue movements
Ans:d
134. Which of the following hormones is not
a secretion product of human placenta
a) Prolactin b) Estrogen
c) Progesterone
d) Human chorionic gonadotropin
Ans:a
135. An ovule which becomes curved so that
the nucellus and embryo sac lie at right angles to the funicle is
a) Campylotropous b) Anatropous
c) Orthotropous d) Hemitropous
Ans:d
136. Angiosperms have dominated the land
flora primarily because of their
a) Property of producing large number
of seeds
b) Nature of self pollination
c) Domestication by man
d) Power of adaptability in diverse habitat
Ans:d
137. Edible part of mango is
a) Receptacle b) Epicarp
c) Mesocarp d) Endocarp
Ans:c
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138. In chloroplasts, chlorophyll is present in the
a) Inner membrane b) Thylakoids
c) Stroma d) Outer membrane
Ans:b
139. In
glycolysis, during oxidation electrons
are removed by
a) Glyceraldehyde - 3 - phosphate
b) NAD+
c) Molecular oxygen
d) ATP
Ans:b
140. Dough kept overnight in warm
weather becomes soft and spongy because of
a) Fermentation b) Cohesion
c) Osmosis
d) Absorption of carbon dioxide
from atmosphere
Ans:a
141. In the somatic cell cycle
a) DNA replication takes place in S-phase
b) A short interphase is followed by a
long mitotic phase
c) G2 phase follows mitotic phase
d) In G1 phase DNA content is double
the amount of DNA present in the original cell
Ans:a
142. A male human is heterozygous
for autosomal genes A and B and is also hemizygous for hemophilic gene h.
What proportion of his sperms will be abh ?
a)  b) 
c)  d) 
Ans:d
143. India's wheat yeild revolution in the
1960s was possible primarily due to
a) Increased chlorophyll content
b) Mutations resulting in plant
height reduction
c) Quantitative trait mutations
d) Hybrid seeds
Ans:c |
