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प्रश्न
Due to which of the following reasons the pollen tube usually grows down towards the egg?
विकल्प
Pollen tube has no other passage to follow.
The filiform apparatus of synergids is believed to attract the pollen tube.
The egg cell attracts the pollen tube as they have dissimilar electric charge.
Pollen tube grows under control of nucleus.
MCQ
उत्तर
The filiform apparatus of synergids is believed to attract the pollen tube.
Explanation:
Synergids' filiform apparatus secretes chemotropically active chemicals that drive pollen tube toward ovule micropyle during porogamy.
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