Multiple choice Which of the following is not involved in the fertilization of fern? Oogamy Pollen tube Archegonium Cillum None of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation Pollen tube is not involved in the fertilization of fern. Pollen tube is a hollow tube which develops from a pollen grain when deposited on the stigma of a flower. It penetrates the style and conveys the male gametes to the ovule.