76
The water potential and osmotic potential of pure water are
1
100 and zero
2
zero and zero
3
100 and 100
4
zero and 100
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77
Rate of transpiration can be measured by
1
Ganong's potometer
2
auxanometcr
3
respirometer
4
porometer
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Answer: Ganong's potometer
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78
Stomata open at night in
1
CAM plants
2
C3 plants
3
C4 plants
4
succulent plants
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79
The most abundant element present in plant is
1
nitrogen
2
manganese
3
carbon
4
iron
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80
In N2-fixation process, nitrite is converted to nitrate by
1
Nitrobacter
2
Azotobacter
3
Nitrosomonas
4
Azospirillum
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81
In photosynthesis, reaction centre of pigment system-I is
1
P680
2
P690
3
P7OO
4
P720
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82
Release of water from plants as water droplet is known as
1
root pressure
2
transpiration
3
osmotic pressure
4
guttation
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83
The end products of aerobic respiration are
1
sugar and oxygen
2
water and energy
3
C02, H20 and energy
4
C02 and energy
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Answer: C02, H20 and energy
84
Apical dominance can be overcome by the application of
1
auxin
2
gibberellin
3
cytokinin
4
florigen
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85
Which of the following is a long-day plant?
1
Glycine max
2
Spinach
3
Mirabilis jalapa
4
Soya bean
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86
Ecological succession on the sandy soil is called
1
psammosere
2
xerosere
3
hydrosere
4
holosere
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87
Mendel's second law is the law of
1
independent assortment
2
segregation
3
dominance
4
polygenic inheritance
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Answer: independent assortment
88
The genotype of a plant showing a dominant phenotype can be determined by
1
backcross
2
testcross
3
dihybrid cross
4
pedigree analysis
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89
Down's syndrome is due to
1
linkage
2
sex-linked inheritance
3
crossing-over
4
non-disjunction of chromosome
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Answer: non-disjunction of chromosome
90
Chemical theory of origin of life was given by
1
Stanley Miller
2
Spallazani
3
Oparin and Haldane
4
Louis Pasteur
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Answer: Oparin and Haldane
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