During pollination, the pollen grain enters flower/pistil.
Student will imagine that the tube is already exist in the stigma like the plastic flag tube( permainan kanak-kanak) containing small round sweets.
From the pollen grain, a pollen tube emerges and grows down to the flower carrying the male gametes.
In order to rebuilt the true concept in student understanding, teacher should show the diagram of growing pollen tube from pollen grain. Therefore, students can observe the growing process. Thus, the early misconception can be eliminated.