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  Encyclopedia of Keywords > Biology > Botany > Plants > Grasses > Pollen   Michael Charnine

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  1. Pollen is a fine to coarse powder consisting of microgametophytes (pollen grains), which produce the male gametes (sperm cells) of seed plants. (Web site)
  2. Pollen is a fine, powdery substance consisting of microscopic grains containing the male gametophyte of certain plants that reproduce sexually. (Web site)
  3. Pollen is a potent stimulator of allergic responses.
  4. Pollen is the most common allergen that affects man.
  5. Pollen is the male component of the plant reproductive system. (Web site)

Large Amounts

  1. Of the geckos visiting this species, two-thirds of them carried large amounts of pollen, suggesting a main role in pollination.


  1. When the antibodies are stimulated by pollen and dust, histamine and other chemicals are released.
  2. Here the moist surface or chemicals cause the pollen grain to germinate. (Web site)


  1. The substances, like tree pollen or dust mites, are called environmental antigens, or allergens, and are normally harmless.
  2. Dr. Theiss Alergol Pollen Blocker Cream (5 grams nasal ointment) contains no preservatives, no scented chemicals, and no other substances are present.


  1. Dust, dirt, pollen, animal dander and other airborne contaminants are pulled into your duct system every time the furnace or air conditioner runs.
  2. This can cause unhealthy air (laden with dirt, dust, pollen, allergens, and other contaminants) to be sucked into your home. (Web site)
  3. Bug Juice is a contact insecticide and the insects cannot make contact with the surface if it is covered with pollen or dirt.


  1. Since this pollen does not become airborne, the only way to get goldenrod pollen on the nasal passages would be to stick the flower up your nose.
  2. The nose, roof of the mouth, eyes, and throat begin to itch gradually or abruptly after the onset of the pollen season. (Web site)
  3. Do not apply Dr. Theiss Alergol Pollen Blocker Cream to open wounds in the nose, since this can alter the natural wound healing process.

Pollen Tubes

  1. The pollen germinate within the pollen chamber and the pollen tubes grow in a haustoria-like manner into the nucellus tissue. (Web site)
  2. For T. fournieri pollen tube guidance across a simple medium and into the ovule was achieved after pollen tubes were grown through a stigma and style [ 22].
  3. Pollen grains from living pinophyte species produce pollen tubes, much like those of angiosperms.


  1. The stigma receives pollen grain, which upon germination, produces a pollen tube which passes through the stigma into the ovary.
  2. There, a pollen tube begins to grow down the style toward the ovary of the pistil, and the two nuclei move into the pollen tube.
  3. From each pollen grain, a pollen tube grows out attempting to travel into the ovary by creating a path through the female tissue. (Web site)


  1. For example, someone allergic to birch pollen may also find that they have an allergic reaction to the skin of apples or potatoes. (Web site)
  2. Cultivars of apples, sweet cherries, pears, Japanese plums, blueberries and elderberries generally need a second cultivar for a pollen source.


  1. Honey bees travel from flower to flower, collecting nectar (later converted to honey), and pollen grains.


  1. Since often multiple pollen tubes grow and multiple archegonia are fertilized, more than one embryo develops. (Web site)
  2. Male apomixis can occur in rare cases, such as the Saharan Cypress where the genetic material of the embryo are derived entirely from pollen. (Web site)


  1. In most of the layers excavated at Franchthi cave, remnants of animals and plants in the form of bone, shell, seed, and pollen were preserved. (Web site)
  2. In almost every seed, the micropyle through which the pollen tube entered the ovule persists as a small opening in the seed coat.
  3. Other images include: seed s – germination and surfaces, root hairs, petal s, and pollen. (Web site)


  1. The other major allergens, such as dust mites, mold and pollen, are so common in the environment it is difficult to avoid exposure.
  2. Exposure to what is normally a harmless substance, such as pollen, causes the immune system to react as if the substance is harmful. (Web site)
  3. It is best started before exposure to known allergens, such as before the grass pollen season. (Web site)


  1. Dogs of any age can develop allergic lung disease from exposure to dust, pollen, or smoke. (Web site)
  2. Conjunctivitis may also be caused by environmental hazards, such as wind, smoke, dust, and allergic reactions caused by pollen, dust, or grass. (Web site)
  3. Condensation nuclei such as smoke, pollen, dust, pollution, etc.


  1. While the pollen of species A may successfully fertilize the egg of species B, the embryo may not be able to naturally survive and develop into a seedling. (Web site)
  2. The gap in the integuments through which the pollen tube enters to deliver sperm to the egg is called the micropyle. (Web site)
  3. In flowering plants, though, pollen tubes are able to cover longer distances to the egg by essentially "squeezing" between cells.


  1. For a seeded plant to fertilize, pollen that lands on the flower must grow a tube to carry sperm to the egg.
  2. After fertilization by a sperm contained in a pollen grain, the zygote develops into the embryo, contained in the seed. (Web site)
  3. Gynoecia may facilitate pollen tube growth to the ovule and delivery of the sperm to the egg.


  1. However, this level may be too high and it can promote growth of house dust mites, molds and fungi and tends to carry more dust and pollen. (Web site)
  2. Now you can be sure your home's air is clear of dust, pollen, fungi, smoke and other particles too small to see.
  3. They chew on decomposing plants, pollen, grains, and fungi. (Web site)


  1. Exposure to allergens, such as pollen, animal dander, or molds. (Web site)
  2. Biological contaminants include bacteria, molds, mildew, viruses, animal dander and cat saliva, house dust mites, cockroaches, and pollen. (Web site)
  3. An adrenal insufficiency is the major cause of allergies to pollen, dusts, molds, animal hair, foods and environmental chemicals. (Web site)


  1. They not only help clean the air of pollen, but of other pollutants as well.
  2. Stay inside with the air conditioner on when a lot of pollen is in the air. (Web site)
  3. On many days in some localities the number of fungal spores in the air far exceeds the pollen grains. (Web site)

Airborne Particles

  1. The allergic rhinitis is a very common illness that many individuals suffer as a consequence of pollen, dust or other airborne particles.
  2. Air filters - Indoors: Air filter elements trap dust, pollen, and other airborne particles as air moves through the air conditioning system. (Web site)


  1. Thus, in every plant, pollen production was estimated separately in male and hermaphrodite cyathia from inflorescence levels 2 and 3, respectively. (Web site)

Female Flowers

  1. Wind carries pollen from male to female catkins or from male catkins to female flowers that take a different form (e.g., in spikes). (Web site)
  2. Bees foraging for nectar routinely contact the stigmata of female flowers and gather significant quantities of the sticky pollen from male blossoms. (Web site)


  1. An IgE antibody made to respond to ragweed pollen, for example, will react only against ragweed, and not oak tree or bluegrass or any other kind of pollen.
  2. Without missing a beat, Grissom informed them that his allergies would not be a problem because "there won't be any ragweed pollen in space". (Web site)
  3. From August until the first frost, the leading cause of hay fever is ragweed pollen. (Web site)


  1. Carlquist, S. 1982. Exospermum stipitatum (Winteraceae): observations on wood, leaves, flowers, pollen, and fruit.
  2. Mostly active at night, bats hunt for various kinds of aerial prey (a basic strategy of the clade) or feed on fruit, nectar, or pollen.
  3. Females ensure that the fruit develops by gathering pollen from another plant and transporting it to the stigma of the flower holding their eggs. (Web site)

Fruit Production

  1. In dioecious species, such as persimmon, parthenocarpy increases fruit production because staminate trees do not need to be planted to provide pollen.
  2. Also a pollen supplementation experiment was performed in 2004 to assess pollen limitation of fruit production. (Web site)


  1. The pollen "triggers" these cells in the nasal membranes, causing them to release histamine and the other chemicals. (Web site)
  2. When the body comes into contact with pollen, cells in the lining of the nose, mouth and eyes release a chemical called histamine.
  3. When the individual next is exposed to the pollen (as in the nose, for instance), the antibodies trigger the cells to secrete their defensive substances.


  1. Pollen cones are generally much smaller than ovulate cones; they contain many sporangia, each of which makes numerous haploid spores by meiosis. (Web site)


  1. Pollen shed in aggregates, or shed as single grains (Drosophyllum); usually in tetrads. (Web site)
  2. The clade of Droseraceae, Nepenthaceae, and relatives is probably supported by carnivory, circinate leaves, and pollen grains in tetrads (Judd et al.


  1. With asthma, the airways are inflamed (swollen) and react easily to certain things, like viruses, smoke, or pollen.
  2. I have asthma, which get irritated by pollen and dust.
  3. While asthma may recur each year during pollen season, it can eventually become chronic. (Web site)

Airborne Allergens

  1. Symptoms occur after airborne allergens like dust, dander, or pollen are inhaled.
  2. The flow of salt water through the nasal passage flushes the dirt, airborne allergens (dust and pollen), pollutants and bacteria-filled mucus. (Web site)


  1. Flowers have specific designs which encourages the transfer of pollen from one plant to another of the same species. (Web site)
  2. Although more than 1,000 species of grass grow in North America, only a few produce highly allergenic pollen. (Web site)
  3. Some predatory mites also feed on pollen, with some species being able to subsist solely on pollen. (Web site)


  1. Self-pollination is the transfer of pollen from one flower to another on the same plant. (Web site)
  2. Following self-pollination, growth of pollen tubes was poorer than in other treatments, and was generally arrested in the upper style. (Web site)


  1. Microspore mother cells undergo meiosis to produce microspores that develop into microgametophytes called pollen grains. (Web site)
  2. Two spore types, microspores and megaspores, are generally produced in pollen cones or ovulate cones, respectively. (Web site)


  1. In gymnosperms and angiosperms, sperm do not need water for mobility but are carried to the female reproductive organs in the pollen grain. (Web site)
  2. The pollen grains of gymnosperms and angiosperms are microgametophytes.
  3. The small male reproductive bodies produced in the pollen sacs of seed plants (gymnosperms and angiosperms). (Web site)

Different Plant

  1. Flowering plants sexually reproduce when birds or bees gather pollen from a plant and transfer it onto a different plant.


  1. Other plants only (mainly) allow cross-pollination where pollen from one plant can only fertilize a different plant.
  2. Actually, cross-pollination, or the transfer of pollen from one plant to another, would perhaps be analogous to sexual intercourse in animals. (Web site)
  3. Cross-pollination transfers pollen from one plant to another of the same species.


  1. The pollen of angiosperms contains two sperm, one of which fertilizes the egg cell in the female gametophyte.
  2. Their role in the life cycle of angiosperms is to receive and adhere to pollen from whatever vector has carried it from it flower of origin.
  3. In the conifers and angiosperms, the sperm are not themselves motile but are conveyed to the ovule by the growing pollen tube. (Web site)


  1. Some plants reproduce by (more or less strict) self-fertilization where pollen from a plant will fertilise reproductive cells or ovules of the same plant.
  2. When pollen lands on the stigma, it grows a pollen tube down the style to conduct the sperm nucleus to the ovules.
  3. The pollen tube germinates from the pollen grain and grows the entire length through the stigma, style and ovules to reach the eggs. (Web site)

Flowering Plants

  1. Pollen may refer to the microspores of either angiosperms (flowering plants) or gymnosperms (conifers and cycads). (Web site)
  2. Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination. (Web site)
  3. For example, the pollen grains of flowering plants develop out of microspores produced in the anthers. (Web site)


  1. Many trees and flowering plants are a good source of pollen for honeybees.
  2. Again, bee pollen does not occur in the body, but is collected from honeybees (Apis millifera) for use as a dietary supplement. (Web site)
  3. In 6 and 3 of the greenhouses, high, respectively low, numbers of honeybees were placed throughout the pollen season of the sweet bell pepper plant. (Web site)


  1. Those sneezy, itchy-eyed, congested months can last well into late fall, as different trees, then grasses and, finally, weeds bombard the air with pollen.
  2. But hay fever is also caused by being allergic to high levels of birch tree pollen in the atmosphere and other types of pollen including weeds and flowers.
  3. The most common allergens to cause reactions in dogs are: pollen, mold, house dust, deodorants, household chemicals, cigarette smoke, weeds and perfume.


  1. Pollens. Shower or bathe before bedtime to wash off pollen and other allergens in your hair and on your skin.
  2. However, insects sometimes gather pollen from staminate anemophilous flowers at times when higher protein pollens from entomophilous flowers are scarce.
  3. Generally pollens that cause allergies are those of anemophilous, because the lightweight pollen grains are produced in great quantities for wind dispersal.


  1. Once the pollen lands on the stigma of a receptive flower, it germinates and starts growing a pollen tube through the carpel. (Web site)
  2. Fertilization of an egg within a carpel by a pollen grain from another flower results in seed development within the carpel. (Web site)
  3. The receptive part of the carpel is called a, a pollen tube delivers sperm into the embryo sac and one sperm nucleus fuses with the egg nucleus.


  1. Pollen production per cyathium was estimated from the number of stamens per cyathium and the number of pollen grains per stamen. (Web site)
  2. A stamen commonly consists of a slender filament topped by a four-lobed anther, each lobe housing a pollen sac. (Web site)


  1. Palynology deals with plant spores and pollen that are both ancient and modern and is a branch of paleobotany.
  2. The study of pollen is called palynology and is highly useful in paleoecology, paleontology, archeology, and forensics. (Web site)
  3. Palynology is a specialized field within paleobotany, dedicated to the study of microscopic plant remains, including spores and pollen grains.


  1. He observed that the symptoms of some of his patients might have been a response to outside allergens such as dust, pollen, or certain foods.
  2. The green parts of the plant, flowers, twigs, and pollen are all toxic, and symptoms of toxicity begin to appear about 6 hours following ingestion.
  3. In fact, the term hay fever is really a misnomer, since allergy to grass pollen is only one cause of symptoms for most people. (Web site)

Pollen Allergy

  1. Inhaling pollen, in some people, can trigger seasonal allergic rhinitis which is also called pollen allergy or hay fever. (Web site)
  2. In the case of pollen allergy, use should be limited to hay fever season.
  3. And it's worth bearing in mind that if you have a pollen allergy you may also find you're sensitive to chamomile.


  1. Biology > Botany > Plants > Grasses
  2. Humans > Health > Diseases > Allergies
  3. Nature > Matter > Materials > Dust
  4. Science > Biology > Botany > Plants
  5. Allergic

Related Keywords

    * Airborne * Airborne Pollen * Allergen * Allergens * Allergic * Allergics * Allergies * Allergy * Anther * Anthers * Bee * Bees * Bee Pollen * Dust * Flower * Flowers * Germination * Grains * Grass * Grasses * Grass Pollen * Hay Fever * Insects * Male Gametophyte * Mold * Nectar * Ovule * Pet Dander * Pistil * Plant * Plants * Pollen Allergies * Pollen Grain * Pollen Grains * Pollen Transfer * Pollen Tube * Pollination * Pollinator * Pollinators * Seeds * Seed Plants * Spores * Stamens * Stigma * Stigmas * Transfer * Trees * Tube * Wind
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  Short phrases about "Pollen"
  Originally created: June 25, 2008.
  Links checked: May 06, 2013.
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