pollen. Wish you will love sentencedict.com and make progress everyday!19. Grouped around the eggs are many stamens producing 25. Certain varieties cannot be fertilised with their own 11. The organism of a hive yields integration for its community of worker bees, drones, 30. Pollen definition, the fertilizing element of flowering plants, consisting of fine, powdery, yellowish grains or spores, sometimes in masses. Many people are allergic to airborne pollutants such as 28. Pollen sentence examples. Examples of Pollen in a sentence. In pollen cones, microsporangia are borne on a single bract without a trace of a second, subtending structure. 1. You can often see the yellow tint of pollen floating through the air in spring. He smelled of pollen, and nectar, and crushed grass. Similar words: poll, sullen, pollution, college, collect, challenged, millennia, colleague. But until then, it's prime time for pollen.
Definition of Pollen. It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules. Home > Pollen in a sentence. The pollen has been dreadful, so pack your eye drops. Certain varieties cannot be fertilised with their own The bumblebee has developed complex machinery for collecting 12. You can buy a formulation containing royal jelly, 22. Pollen, the male reproductive agent of plants, is everywhere. The dotted lines with the arrow show the directions in which Fertilization is effected by insects, especially by bees, which are directed in their search by the colour and fragrance of the flowers; but some Botanists were for a long time content to know that the scattering of the Cross fertilization, or the impregnation of any given flower by Many plants produce, in addition to ordinary open flowers, so-called cleistogamous flowers, which remain permanently closed but which notwithstanding produce fruit; in these the corolla is inconspicuous or absent and the Besides the internal or centripetal growth, some cell-walls are thickened on the outside, such as The proboscis, passing down this groove to the spur, becomes dusted with The eggs are deposited in the ovary-wall, usually just below an ovule; after each deposition the moth runs to the top of the pistil and thrusts some terminating the short annual shoot which bears a whorl of four or more leaves below the flower; in this and in some species of the nearly allied genus Trillium (chiefly temperate North America) the flowers have a fetid smell, which together with the dark purple of the ovary and stigmas and frequently also of the stamens and petals, attracts carrion-loving flies, which alight on the stigma and then climb the anthers and become dusted with Owing, however, to the close proximity of stigma and anthers, very slight irregularity in the movements of the visiting insect will cause self-pollination, which may also occur by the dropping of Hybridization can also be readily controlled in the case of tobaccos, and in this connexion it is useful to note that, if The flowers appear generally before the leaves and are thus rendered more conspicuous, while passage of c, The one-celled ovary cut a, The anther, con transversely, having three taining The insects visit the plant in large numbers, attracted by the foetid smell, and act as carriers of the In 1703 Samuel Morland, in a paper read before the Royal Society, stated that the farina (The ANGIOSFERMS, which are much the larger class, derive their name from the fact that the carpel or carpels form a closed chamber, the ovary, in which the ovules are developedassociated with this is the development of a receptive or stigmatic surface on which the Bees carry the spores of Scierotinia as they do the Mottier, The Development of the Heterotype Chromosomes in The male gametophyte is represented by one or few cells and, except in a few primitive forms where the male cell still retains the motile character as in the Pteridophyta, is carried passively to the macrospore in a development of the In such cases the contact of an insect or other body with those processes is sufficient to liberate the The scales around the throat of the corolla protect the There is a close relation between the pollination of many yuccas and the life of a moth (Pronuba yuccasella); the flowers are open and scented at night when the female moth becomes active, first collecting a load of cell, which is non-motile, is carried to the oosphere by means of a They are present from the beginning of the development of the cell-wail, and arise from the spindle fibres, all of which may be continued as connecting threads (endosperm of Tamus communis), or part of them may be overlaid by cellulose lamellae (endosperm of Lilium Martagon), or they may be all overlaid as in With respect to the production of hybrids, the genus is remarkable for its power of resisting the influence of foreign The former, which is a somewhat less favourable method than the latter, is effected by air-currents, insect agency, the actual contact between stigmas and anthers in neighbouring flowers, where, as in the family Compositae, flowers are closely crowded, or by the fall of the The smoothie menu has non-dairy selections and is backed with healthy additions such as protein powder, bee See Lampel, Urkundenbuch des Chorherrenstifts Sankt This causes them to be drawn to those flowers in their search of The spores, as in the heterosporous Pteridophyta, are of two kindsmicrospores (7), so called from the seal-like scars on the rhizome of stems of previous seasons, the hanging flowers of which contain no honey, but are visited by bees for the The general view was, that the embryo originated in the ovule, which was in some obscure manner fertilized by the The small pendulous bellshaped flowers contain no honey but are visited by bees for the A male flower has floated alongside a female and one of its anthers, which have opened to set free the - A Freycinetia, native of Java, and a species of Bauhinia in Trinidad are visited by bats which transfer the In small flowers which are crowded at the same level or in flat flowers in which the stigmas and anthers project but little, slugs or snails creeping over their surface may transfer to the stigma the aid is sought, and there are also numerous devices for protecting the - Pollination I, Flower visited by a humblebee, showing the projection of the curved connective bearing the anther from the helmetshaped upper lip and the deposition of the The flowers have an attractive floral envelope, are scented and often contain honey or a large amount of In Broom there is an explosive machanism; the pressure of the insect visitor on the keel of the corolla causes a sudden release of the stamens and the scattering of a cloud of Sprengel came very near to appreciating the meaning of cross-pollination in the life of plants when he states that "it seems that Nature is unwilling that any flower should be fertilized by its own pratense, each whorl of stamens ripens in turn, becoming erect and shedding their self-pollination is rendered possible, since the divisions of the stigma begin to separate before the outer stamens have shed all their The colour and markings of a flower often serve to guide the insects to the honey, in the obtaining of which they are compelled either to remove or to deposit In wind-fertilized plants the flowers are comparatively inconspicuous and devoid of much attraction for insects; and their In a vinery, tomatohouse or a peach-house it is often good practice at the time of flowering to tap the branches smartly with a stick so as to ensure the dispersal of the Sometimes more delicate and direct manipulation is required, and the gardener has himself to convey the To prevent self-fertilization, or the access of insects, it is advisable to remove the stamens and even the corolla from the flower to be impregnated, as its own some passion-flowers and rhododendrons, in which a flower is more or less sterile with its own, but fertile with foreign It is a singular circumstance that reciprocal crosses are not always or even often possible; thus, one rhododendron may afford Standard fruit trees must be left to take their chance; and, indeed from the lateness of their flowering, they are generally more injured by blight, and by drenching rains, which wash away the Uredospores, septa of Basidiomycetes), spirals, reticulations, rings, &c. (capillitium fibres of Podaxon, Calostoma, Battarrea), occur as in the vessels of higher plants, while sculptured networks, pittings and so forth are as common on fungus-spores as they are on In many cases the slimy masses of spermatia (Uredineae), conidia (Claviceps), basidiospores (Phallus, Coprinus), &c., emit more or less powerful odours, which attract flies or other insects, and it has been shown that bees carry the flagrant oidia of Sclerotinia to the stigma of Vaccinium and infect it, and that flies carry away the foetid spores of Phallus, just as They are usually included in Oomycetes, but their simple structure, minute size, usually uniciliate zoospores, and their negative characters would justify their retention as a separate group.
pollen meaning: 1. a powder, produced by the male part of a flower, that causes the female part of the same type of…. Learn more. 73. 59. Pollen in a sentence up(0) down(0) Sentence count:236+8 Only show simple sentencesPosted:2016-09-26Updated:2016-12-13. 1/8 Flowers are designed to attract insects which then carry the 27. It fertilizes other flowers of the same... | Meaning, pronunciation, translations and examples Copyright © 2016 sentencedict.com All Rights Reserved Contact:
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