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Q.

After penetrating stigmatic and stylar tissue the pollen tube usually grows down towards the egg cell because :

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a

it has no other passage to follow.

b

it grows under the control of egg nucleus.

c

the egg cell attracts the pollen tubes as they have dissimilar electric charge.

d

the filiform apparatus of synergids are believed to attract the pollen tubes.

answer is D.

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Detailed Solution

After penetrating the stigmatic and stylar tissue the pollen tube usually grows down towards the egg cell because the filiform apparatus of synergids are believed to attract the pollen tube.

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