61.
How many pollen sace are present in a mature anther
A
4
B
1
C
3
D
2
Answer :
2
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62.
What is the cause of dormancy in Tomato seeds
A
Hard seed coat
B
Presence of Ferulic acid
C
Undeveloped embryo
D
All of the above
Answer :
Presence of Ferulic acid
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63.
The fleshy receptacle ofsyconus of fig encloses a number of:
A
Achenes
B
Samaras
C
Berries
D
Mericarps
Answer :
Achenes
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64.
Which hormone can break dormancy of seed
A
ABA
B
Auxin
C
GA
D
Coumarin
Answer :
GA
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65.
In Angiosperm, if number of chromosomes in endosperm is 30, what will be the no. of chromosome in nucellus
A
15
B
30
C
20
D
40
Answer :
20
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66.
What is the direction of micropyle in anatropous ovule ?
A
upward
B
downward
C
right
D
left
Answer :
downward
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67.
In which of the following plant group, seeded plants are placed
A
Algae
B
Bryophyta
C
Angiosperms
D
Fungi
Answer :
Angiosperms
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68.
Seeds of Watermelon are embedded in water pulp of the fruit but do not germinate because
A
Light is absent
B
O2 is absent
C
ABA is present
D
Nutrients are absent
Answer :
ABA is present
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69.
Which of the following statements is not correct?
A
Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style
B
Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers
C
Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil
D
Some reptiles have also been reported as pollinators in some plant species
Answer :
Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style
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70.
Ovule with hilum lying close to micropyle is known as
A
Anatropous
B
Circinotropous
C
Atropous
D
All of the above
Answer :
Anatropous
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