1. In the nutrient medium, the pollen will germinate and pollen tube comes out through germ pore.
2. It is due to enlargement of tube cell and stretching of the intine, pollen tube comes out and
grows.
Inferences :-
Answers
Answer:
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Explanation:
A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tube elongation is an integral stage in the plant life cycle. The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms. In maize, this single cell can grow longer than 12 inches (30 cm) to traverse the length of the pistil.
SEM image of pollen tubes growing from Lily pollen grains.
Pollen tubes were first discovered by Giovanni Battista Amici in the 19th century.
They are used as a model for understanding plant cell behavior. Research is ongoing to comprehend how the pollen tube responds to extracellular guidance signals to achieve fertilization.