Polar expansion is usually a common phenomenon in plants spanning all taxonomic groups from your Charophycean Green Algae to pollen tubes in Angiosperms and Gymnosperms. tube. The shank constitutes most of the pollen tube. Differential Interference Contrast (DIC) microscopy image. Bar = 6 m; … 2. Common Components and Processes Associated with Polar Growth in… Continue reading Polar expansion is usually a common phenomenon in plants spanning all