Number of male gemetes present in pollen tube are

The correct option is B 2
The pollen tube consists of two male gametes. One male gamete fertilizes the egg cell placed in between the egg apparatus and forms the diploid oospore/zygote which forms embryo after maturation. While the other male gamete fuses with the two polar nuclei of the central cell and forms the triploid PEN (Primary Endosperm Nucleus) which results in the formation of endosperm after maturation.

So, the pollen tube consists of 2 male gametes for the process of double fertilization to take place in angiosperm plants.

So, the correct answer is '2'.