121. Which of the following is not a chromosomal
mechanism for sex determination?
A) Genic balance mechanism
B) Haploid diploid mechanism
C) Metabolic mechanism
D) Single gene mechanism
122. Which assisted reproductive technology has been used
for the longest time period?
A) Intracytoplasmic sperm injection
B) Artificial insemination
C) In vitro
fertilization
D) Gamete intrafallopian transfer
123. Lysosomes
containing inactive enzymes are called
A) Autophagosomes
B) Residual bodies
C) Secondary lysosomes
D) Primary lysosomes
124. Transpiration pull will be maximum under which of
the following conditions ?
A) Open stomata, high humid atmosphere, and well irrigated
soil
B) Open stomata, high humid atmosphere, and dry soil
C) Open stomata, dry atmosphere, and moist soil
D) Closed stomata, low light intensity and humid atmosphere
125. Hepatic portal system starts from
A) Digestive system to liver
B) Kidney to liver
C) Liver to heart
D) Liver to kidney
126. Ivan Pavlov performed experiments on
A) Simple reflexes
B) Conditioned reflexes
C) Cardiac reflexes
D) Origin of life
127. Greenhouse effect is caused by
A) Green plants
B) Infrared rays
C) UV rays
D) X-rays
128. Free living nitrogen fixing bacteria are
A) Nitrosomonas
B) Clostridium
C) Rhizopus
D) Anabaena
129. Eutrophication is caused by excess of ______in
water.
A) Nutrients
B) Heavy metals
C) Pesticides
D) Microbes
130.
Photosynthetic pigment present in plants are
A) Chlorophyll a and b
B) Chlorophyll a and c
C) Chlorophyll a
D) Chlorophyll b
131. In aerobic organisms, glucose is converted into______as
a final product
A) Lactic acid
B) CO2
C) O2
D) Ethanol
132. The role of double fertilization in angiosperms is
to produce
A) Integuments
B) Endosperm
C) Endocarp
D) Cotyledons
133. Natural pacemaker in heart is
A) SA node
B) Purkinje fibers
C) Chordae tendineae
D) Mitral valve
134. The excretory organs in arthropods are
A) Nephron
B) Flame cells
C) Tubefeet
D) Malpighian tubules
135. Which part of the brain in human body controls
temperature?
A) Cerebellum
B) Medulla
C) Hypothalamus
D) Thalamus
136. Addison’s disease is caused by deficiency of a
hormone which is secreted by
A) Pitutiary gland
B) Adrenal cortex
C) Thyroid
D) Thymus
137. Which of the following is a secondary pollutant?
A) Aerosol
B) CO
C) PAN
D) SO2
138. The layer of earth’s atmosphere in which clouds
occur is
A) Stratosphere
B) Troposphere
C) Thermosphere
D) Mesosphere
139. Hybrid vigour is due to
A) Homozygosity of pure characters
B) Superiority of all genes
C) Heterozygosity
D) Mixing up of the cytoplasm of male with that of female
140. Crosses between two plants by the same variety are
called
A) Intravarietal
B) Intervarietal
C) Interspecific
D) Intergenic
