141.
In Angiosperms, endosperm is formed by A
Division of fused polar nuclei
B
Free nuclear division of megaspore
C
Division of fused synergids and male gamete
D
Division of fused polar nuclei and male gamete
Answer :
Division of fused polar nuclei and male gamete
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142.
Animal vectors are required for pollination in A
Maize
B
Vallisneria
C
Mulberry
D
Cucumber
Answer :
Cucumber
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143.
After culturing the anther of a plants few diploid plant were got along with haploid plant. Which of the following part might have given rise to diploid plant A
Vegetative cell of pollen
B
Exine of pollen wall
C
Cell of anther wall
D
Generative cell of pollen
Answer :
Cell of anther wall
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144.
Callase' anzme which dissolve callose of tetrad of microspores to separate 4 microspores is provided by A
Pollen grains
B
Middle layer
C
Tapetum
D
Endothecium
Answer :
Tapetum
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145.
Orthotropus ovule belongs to A
Capsella
B
Polygonum
C
Ranunculus
D
All of the above
Answer :
Polygonum
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146.
Embryo sac occurs in A
Embryo
B
Axis part of embryo
C
Ovule
D
Endosperm
Answer :
Ovule
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147.
In Capsella the endosperm is formed A
At the time of fertilization
B
Before fertilization
C
After fertilization
D
Before pollination
Answer :
After fertilization
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148.
A polygonum type of embryosac is A
7 - celled and 8 nucleate
B
8 - celled and 7 nucleate
C
7 - celled and 7 nucleate
D
8 - celled and 8 nucleate
Answer :
7 - celled and 8 nucleate
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149.
Male gametes of the Capsella fused with A
Egg
B
Secondary nucleus
C
A and B both
D
None of the above
Answer :
A and B both
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150.
Pollen grains can be stored for several years in liquid nitrogen having a temperature of A
-120°C
B
-80°C
C
-160°C
D
-196°C
Answer :
-196°C
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