After penetrating the stigmatic and stylar tissues,the pollen tube usually grows down towards the egg because:
- AThe egg cell attracts the pollen tube as they have dissimilar electric charges.
- BThe filiform apparatus of synergids is believed to attract the pollen tube.
- CIt has no other passage to follow.
- DIt grows under the control of the nucleus.
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$A$: Initial growth of the pollen tube takes place at the expense of food present in the stigma and style.
$R$: The pollen tube travels intracellularly and chemotactically.
$R$: The pollen tube travels intracellularly and chemotactically.
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