pollen grain
Americannoun
Etymology
Origin of pollen grain
First recorded in 1825–35
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In the process of plant reproduction, when a pollen grain that transports male gametes lands on the stigma of another flower, it initiates the formation of a pollen tube.
From Science Daily ● May 21, 2024
Normally, a pollen grain that sticks to the stigma of a flower during pollination germinates into a long tube that grows straight and unbranched through the ovary to the ovules, where fertilisation takes place.
From Science Daily ● Apr. 16, 2024
When a pollen grain reaches the stigma, a pollen tube extends from the grain, grows down the style, and enters through the micropyle: an opening in the integuments of the ovule.
From Textbooks ● Jan. 1, 2015
The mature pollen grain is composed of two cells: the pollen tube cell and the generative cell, which is inside the tube cell.
From Textbooks ● Jan. 1, 2015
Pollen was assumed to have germinated if the length of the pollen tube exceeded the diameter of the pollen grain.
From Northern Nut Growers Association Thirty-Fourth Annual Report 1943 by Northern Nut Growers Association
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
