The entry of the pollen tube into the ovule through the micropyle is known as:

  • A
    Mesogamy
  • B
    Porogamy
  • C
    Chalazogamy
  • D
    None of these

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Which of the following in the female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the egg?

Pollen grains can be stored for several years in liquid nitrogen having a temperature of (in $^oC$)

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