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Olympiad-Science
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Class 10
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Q)
The growth of pollen tubes towards ovules is due to
(
a
)
H
y
d
r
o
t
r
o
p
i
s
m
(
b
)
C
h
e
m
o
t
r
o
p
i
s
m
(
c
)
G
e
o
t
r
o
p
i
s
m
(
d
)
P
h
o
t
o
t
r
o
p
i
s
m
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