(B) The correct answer is $B$. In angiosperms,the process of pollen tube guidance is mediated by chemical signals. The filiform apparatus present in t

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The filiform apparatus of synergids is believed to attract the pollen tube.

(B) The correct answer is $B$. In angiosperms,the process of pollen tube guidance is mediated by chemical signals. The filiform apparatus present in the synergid cells secretes chemotropic substances that attract the pollen tube towards the micropyle of the ovule,ensuring successful fertilization.

Class 12 Biology Sexual Reproduction in Flowering Plants Pollen Pistil Interaction

Medium

After penetrating the stigmatic and stylar tissues,the pollen tube usually grows down towards the egg because:

A
The egg cell attracts the pollen tube as they have dissimilar electric charges.
B
The filiform apparatus of synergids is believed to attract the pollen tube.
C
It has no other passage to follow.
D
It grows under the control of the nucleus.