News tagged with pollen
Study suggests dinosaurs killed off by more than one asteroid
(PhysOrg.com) -- Dinosaurs, along with over half of other species, became extinct at the end of the Cretaceous period about 65.5 million years ago, and many scientists believe this was due to a single impact ...
Space & Earth / Earth Sciences
Aug 31, 2010 |
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Honeybees entomb to protect from pesticides
(PhysOrg.com) -- With the drastic rise in the disappearance of honeybee colonies throughout the world in recent years there has become a large focus on the study of honeybees and the effects of pesticides ...
Apr 08, 2011 |
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Algae and pollen grains provide evidence of remarkably warm period in Antarctica's history
For Sophie Warny, LSU assistant professor of geology and geophysics and curator at the LSU Museum of Natural Science, years of patience in analyzing Antarctic samples with low fossil recovery finally led to a scientific breakthrough. ...
Space & Earth / Earth Sciences
Oct 01, 2009 |
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Global warming means longer allergy seasons: study
Ragweed allergy season in North America has grown two to four weeks longer in recent years because of warmer temperatures and later fall frosts, researchers said.
Feb 21, 2011 |
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Scientist uses sedimentary record to uncover planet's past
(PhysOrg.com) -- The wind barreled across the ice at Daily Lake as Montana State University paleoecologist Cathy Whitlock and three students used all their strength to pull a metal pipe out of the mucky lake ...
Space & Earth / Earth Sciences
Feb 27, 2009 |
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Early sunflower family fossil found in South America
(PhysOrg.com) -- A beautifully preserved fossil identified as being of an early relative of the Asteraceae, or aster, family nearly 50 million years old suggests the plant family, which has now colonized much ...
Other Sciences / Archaeology & Fossils
Sep 28, 2010 |
5 / 5 (7) |
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Scientists discover first ever record of insect pollination from 100 million years ago
Amber from Cretaceous deposits (110-105 my) in Northern Spain has revealed the first ever record of insect pollination. Scientists have discovered in two pieces of amber several specimens of tiny insects covered ...
May 14, 2012 |
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Biologists Unlock Secrets of Plants' Growing Tips
(PhysOrg.com) -- Biologist Magdalena Bezanilla and colleagues at the University of Massachusetts Amherst have used a technique they call multi-gene silencing to, for the first time, simultaneously silence nine genes in a ...
Aug 25, 2009 |
5 / 5 (6) |
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Fossilized pollen unlocks secrets of 2,500-year-old royal garden
Researchers have long been fascinated by the secrets of Ramat Rahel, located on a hilltop above modern-day Jerusalem. The site of the only known palace dating back to the kingdom of Biblical Judah, digs have ...
Other Sciences / Archaeology & Fossils
Feb 16, 2012 |
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Pollen Folds Like Origami
For those of us with allergies, springtime pollen is an invisible nuisance. But under the high-powered microscopes of Eleni Katifori, a biophysicist at Rockefeller University in New York, the grains of plant ...
Apr 20, 2010 |
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EU court backs angry honeymaker in GM pollen row
The presence of pollen from GM maize in honey, even in minuscule quantities, renders farm produce commercially void in the European Union, the bloc's top court said Tuesday.
Sep 06, 2011 |
4.8 / 5 (4) |
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Gone with the wind: Far-flung pine pollen still potent miles from the tree
When forest biologist Claire Williams boards ferries bound for North Carolina's Outer Banks, the barrier islands that line the NC coast, ferry captains call her the "Pollen Lady."
Apr 05, 2010 |
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Flight of the bumble (and honey) bee
Insects such as honeybees and bumble bees are predictable in the way they move among flowers, typically moving directly from one flower to an adjacent cluster of flowers in the same row of plants. The bees' ...
Mar 20, 2009 |
5 / 5 (3) |
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Evidence is weak for tropical rainforest 65 million years ago in Africa's low-latitudes
(PhysOrg.com) -- The landscape of Central Africa 65 million years ago was a low-elevation tropical belt, but the jury is still out on whether the region's mammals browsed and hunted beneath the canopy of a ...
Other Sciences / Archaeology & Fossils
Oct 20, 2010 |
4.7 / 5 (3) |
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Can modern-day plants trace their New Zealand ancestry?
One hundred million years ago the earth looked very different from how it does today. Continents were joining and breaking apart, dinosaurs were roaming the earth, and flowering plants were becoming more widespread.
Jan 21, 2010 |
5 / 5 (2) |
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Pollen
Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes (sperm cells). Pollen grains have a hard coat that protects the sperm cells during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants. When pollen lands on a compatible pistil or female cone (i.e., when pollination has occurred), it germinates and produces a pollen tube that transfers the sperm to the ovule (or female gametophyte). Individual pollen grains are small enough to require magnification to see detail.
For more information about Pollen, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
