The pollen tube enters the embryo sac via three different routes. Explain and enumerate the advantages of cross pollination.

In plant anatomy and embryology, the pollen tube is a crucial structure involved in the fertilization process. The pollen tube, which contains male gametes (sperms), enters the embryo sac through three distinct routes:

1. Direct Penetration: In some plant species, the pollen tube directly penetrates the ovule through the micropyle, a small pore in the ovule's integuments. This route allows for a __________ ________ _______ ___ ________ ___ ____ ________ _________.
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