51. What is the fate
of the male gametes discharged in the synergid?
(1) One fuses with
egg other(s) degenerate (s) in the synergid.
(2) All fuse with the egg.
(3) One fuses with
the egg, other(s) fuse(s) with synergid nucleus.
(4) One fuses with
the egg and other fuses with central cell nuclei.
Answer (4) One fuses with the
egg and other fuses with central cell nuclei.
52. What is the site
of perception of photoperiod necessary for induction of flowering in plants?
(1) Lateral buds (2) Pulvinus (3) Shoot apex (4) Leaves
Answer (4) Leaves
53. Select the
correctly written scientific name of Mango which was first described by Carolus
Linnaeus
(1) Mangifera indica Car. Linn.
(2) Mangifera indica
Linn.
(3) Mangifera indica
(4) Mangifera Indica
Ans: (2) Mangifera indica Linn.
54. Following statements describe the characteristics of the
enzyme Restriction Endonuclease. Identify the incorrect statement.
(1) The enzyme cuts
DNA molecule at identified position within the DNA.
(2) The enzyme binds DNA at specific sites and cuts only one
of the two strands.
(3) The enzyme cuts
the sugar-phosphate backbone at specific sites on each strand.
(4) The enzyme
recognizes a specific palindromic nucleotide sequence in the DNA.
Answer
(2) The enzyme binds DNA at specific sites and cuts only one of the two
strands.
55. From evolutionary
point of view, retention of the female gametophyte with developing young embryo
on the parent sporophyte for some time, is first observed in
(1) Liverworts (2) Mosses (3) Pteridophytes (4) Gymnosperms
Answer: (3) Pteridophytes
56. In Antirrhinum
(Snapdragon), a red flower was crossed with a white flower and in F1 generation
pink flowers were obtained. When pink flowers were selfed, the F2 generation
showed white, red and pink flowers. Choose the incorrect statement from the
following :
(1) This experiment does not follow the Principle of
Dominance.
(2) Pink colour in F1 is due to incomplete dominance.
(3) Ratio of F2 is 1/ 4 (Red) : 2/ 4 (Pink) : 1/ 4 (White)
(4) Law of Segregation does not apply in this experiment
Ans: (4) Law of Segregation does
not apply in this experiment
57. Conversion of
glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis,
is catalyzed by
(1) Aldolase (2)
Hexokinase (3) Enolase (4) Phosphofructokinase
Answer: (2) Hexokinase
58. Drug called
‘Heroin’ is synthesized by
(1) methylation of
morphine (2) acetylation of morphine
(3) glycosylation of morphine (4) nitration of morphine
Answer: (2) acetylation of
morphine
59. Select the
hormone-releasing Intra-Uterine Devices.
(1) Vaults, LNG-20
(2) Multiload 375, Progestasert
(3) Progestasert,
LNG-20
(4) Lippes Loop,
Multiload 375
Answer:(3) Progestasert, LNG-20
60. A gene locus has
two alleles A, a. If the frequency of dominant allele A is 0.4, then what will
be the frequency of homozygous dominant, heterozygous and homozygous recessive
individuals in the population?
(1) 0.36(AA); 0.48(Aa); 0.16(aa)
(2) 0.16(AA); 0.24(Aa); 0.36(aa)
(3) 0.16(AA); 0.48(Aa); 0.36(aa)
(4) 0.16(AA); 0.36(Aa); 0.48(aa)
Answer: (3) 0.16(AA); 0.48(Aa); 0.36(aa)