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144. The most likely reason for the
development of resistance against pesticides in
insects damaging a crop is
a) Genetic recombination
b) Directed mutations
c) Acquired heritable changes
d) Random mutations
Ans:d
145. The following ratio is generally constant
for a given species
a) T + C / G + A b) G + C / A + T
c) A + C / T + G d) A + G / C + T
Ans:b
146. A self-fertilizing trihybrid plant forms
a) 4 different gametes and 16
different zygotes
b) 8 different gametes and 16
different zygotes
c) 8 different gametes and 32
different zygotes
d) 8 different gametes and 64
different zygotes
Ans:d
147. Lichens are well known combination of
an alga and a fungus where fungus has
a) An epiphytic relationship with the alga
b) A parasitic relationship with the alga
c) A symbiotic relationship with the alga
d) A saprophytic relationship with the alga
Ans:c
148. Which of the following is expected to
have the highest value (gm/m2/yr) in a
grassland ecosystem
a) Tertiary production
b) Gross production (GP)
c) Net production (NP)
d) Secondary production
Ans:b
149. Lack of independent assortment of
two genes A and B in fruit fly Drosophila is due to
a) Recombination b) Linkage
c) Crossing over d) Repulsion
Ans:b
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150. In your opinion, which is the most
effective way to conserve the plant diversity of an area
a) By creating biosphere reserve
b) By creating botanical garden
c) By developing seed bank
d) By tissue culture method
Ans:a
151. If by radiation all nitrogenase enzymes
are inactivated, then there will be no
a) Fixation of atmospheric nitrogen
b) Conversion from nitrate to nitrite
in legumes
c) Conversion from ammonium to nitrate
in soil
d) Fixation of nitrogen in legumes
Ans:a
152. In 1984, the Bhopal gas tragedy took
place because methyl isocyanate
a) Reacted with ammonia
b) Reacted with
CO2
c) Reacted with water
d) Reacted with DDT
Ans:c
153. Which one of the following is the
correct matching of a vitamin, its nature and its deficiency disease
a) Vitamin K - Fat-soluble - Beri-beri
b) Vitamin A - Fat-soluble - Beri-beri
c) Vitamin K - Water-soluble - Pellagra
d) Vitamin A - Fat-soluble - Night blindness
Ans:d
154. Photosynthetically active radiation
(PAR) represents the following range of wavelength
a) 450 - 950 nm b) 340 - 450 nm
c) 400 - 700 nm d) 500 - 600 nm
Ans:c |
