ovule In A Sentence
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- Pollen typically lands directly on the ovule.
- Dorsiventrality is also clearly derived from radial construction, and anatropy of the ovule has followed atropy.
- The last ovule shape is called "'amphitropous "', where the ovule is partly inverted and turned back 90 degrees on its stalk ( the funicle or "'funiculus "').
- Ovary of Camellia chrysantha (Hu) Tuyama. 3-5 locules, bearing 3-5 anatropous bi-integument ovules, axile placentation, ten-uinucellate ovule.
- A stalk connecting an ovule or a seed with the placenta.
- Megasporogenesis occurs in megastrobili in conifers ( for example a pine cone ) and inside the ovule in the flowers of flowering plants.
- The ovules are attached to the placenta, which consists of a mass of cellular tissue, through which the nourishing vessels pass to the ovule.
- Testa The hard dry protective covering of a seed, formed from the integuments of the ovule.
- The male inflorescence is built up of four to six apetalous flowers, while the female inflorescence normally consists of only one apetalous flower and contains one ovary and one ovule.
- A diploid cell ( megaspore mother cell ) in the ovule undergoes meiosis ( involving two successive cell divisions ) to produce four cells ( megaspores or female gametes ) with haploid nuclei.
- The sporangium is attached to the enlarged distal end of its pedicel, from which it hangs down, so as to suggest an anatropous ovule on its funiculus.
- A complete and functional female flower consists of a single ovule with two integuments, the inner of which is prolonged into a narrow tubular micropyle, like that in the flower of Gnetum.
- The connexion between the base of the ovule and the base of the nucellus is kept up by means of the raphe r.
- The other fuses with genetic material in the ovule to produce a triploid tissue (has three copies of each chromosome).
- In this scheme " Cenarrhenes " is located within the subfamily Proteoideae on account of it having cluster roots, a solitary ovule and indehiscent fruits.
- The micropyle is an opening in the protective layers of the ovule.
- The embryo is developed from the zygote and the seed coat from the integuments of the ovule.
- In other species the infection occurs through the style of the flower, but the fungus after reaching the ovule develops no further during that year but remains dormant in the embryo of the seed.
- Pollen-producing cones fusiform ( tapering at both ends ), Megasporophylls ( female, ovule-producing ) up to 30 cm long, each with 2-5 ovules.
- - Vertical section of the ovule of the Austrian Pine (Pinus austriaca), showing the nucellus a, consisting of delicate cellular tissue containing deep in its substance an embryo-sac b.
- When the ovule is so developed that the chalaza is at the hilum (next the placenta), and the micropyle is at the opposite extremity, there being a short funicle, the ovule is orthotropous.
- Three "'antipodal cells "'form on the opposite ( chalazal ) end of the ovule and later degenerate.
- In Late Devonian and early Mississippian species, the cupule contained several ovules, but by Pennsylvanian times there was normally just a single ovule per cupule.
- A megasporangium invested in protective layer called an integument is known as an ovule.
- The vascular bundle of ovule of Phytolacca is evidently from the vascular tissue of receptacle.
- A young ovule consists of a conical nucellus surrounded by a single integument terminating as a two-lipped micropyle.
- The " female " cells called megaspores, which will divide to become the egg cell ( megagametogenesis ), are contained in the ovule and enclosed in the carpel ( or megasporophyll ).
- In gymnosperms ( e . g ., conifers ), the pollen is drawn into the ovule on a drop of fluid that exudes out of the micropyle, the so-called pollination drop mechanism.
- The maternal tissues of the ovule include the integuments and the nucellus.
- In eudicot plants, the entire process happens inside the ovule of a plant.
- The part by which the ovule is attached to the placenta or cord is its base or hilum, the opposite extremity being its apex.
- Seed development in most instances commences following fertilization of the ovule.
- When placed on the ovary, and makes its way along the placenta, guided by projections or hairs, to the micropyle of an ovule.
- 32, A, it appears that each ovule was borne terminally, on an extremely short axillary shoot, as in Taxus among recent Gymnosperms. The ovule consists of an integument (regarded by some writers as dou
- The ovary is inferior and has only one ovule, with basal placentation.
- The general view was, that the embryo originated in the ovule, which was in some obscure manner fertilized by the pollen.
- The ovule then develops into a kernel.
- Before following the growth of the pollen-grain after pollination, we will briefly describe the structure of a cycadean ovule.
- 1) having a thin outer skin (epicarp) enclosing the flesh of the peach (mesocarp), the inner layers of the carpel becoming woody to form the stone, while the ovule ripens into the kernel or seed.
- The ovule appears at first as a small cellular projection from the placenta.
- The development of research has resolved in part many important problems, such as the origin and molecular mechanism of ovule ontogenesis. But these problems still require further study.
- When such ovules are preserved as petrifactions, they are assigned to the fossil genera " Pachytesta " or " Stephanospermum ", depending mainly on differences in the apical form of the ovule.
- Incompatible pollen tubes grow more slowly and, at least in some, the pollen tube bursts before it reaches the ovule and the polysaccharide callose is deposited around the tube.
- When a pollen grain adheres to the stigma of a carpel it germinates, developing a pollen tube that grows through the tissues of the style, entering the ovule through the micropyle.
- After pollination, a tube grows from the pollen through the stigma into the ovary to the ovule and two sperm are transferred from the pollen to the megagametophyte.
- Part of ovule in longitudinal section.
- An obturator is present in the ovary of some plants, near the micropyle of each ovule.
Similar words: Ovule, Ovuliferous, Ovulatory, Ovulate, Ovum, Ovulates, Ovules, Ovulum, Ovulation, Ovular, Ovulated, Ovulating, Ovula