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Which of the following stimulates the growth of the pollen tube?

$A$: 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.

After entering the embryo sac,the tip of the pollen tube swells and bursts due to:

Through which path does the pollen tube enter the ovule?

Which one of the following is not associated with pollen-pistil interaction?

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