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(A) Upon reaching the embryo sac,the pollen tube enters through the micropyle or other regions. The cytoplasm of the synergids contains a high concent

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Endosmosis

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(A) Upon reaching the embryo sac,the pollen tube enters through the micropyle or other regions. The cytoplasm of the synergids contains a high concentration of solutes compared to the pollen tube tip. This creates a water potential gradient,causing water to move from the synergids into the pollen tube tip via $Endosmosis$. This influx of water increases the turgor pressure within the pollen tube tip,causing it to swell and eventually burst,thereby releasing the male gametes into the embryo sac.

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

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