Ova Sentence Examples
To establish the exact relationship it is necessary not only to breed but to rear the medusa, which cannot always be done in 1 In some cases hydroids have been reared in aquaria from ova of medusae, but these hydroids have not yet been found in the sea (Browne [Io a]).
Many Gastropoda deposit their eggs, after fertilization, enclosed in capsules; others, as Paludina, are viviparous; others, again, as the Zygobranchia, agree with the Lamellibranch Conchifera (the bivalves) in having simple exits for the ova without glandular walls, and therefore discharge their eggs unenclosed in capsules freely into the sea-water; such unencapsuled eggs are merely enclosed each in its own delicate chorion.
The developing ova are 19.
To get at the female and the ova prolonged soaking in soap and water is necessary, the epiderm being rubbed away and the ointment then applied.
The fundamental uniform fact in nature is constant change (lravra Xwpei Kai ovSiv Ova); everything both is and is not at the same time.Advertisement
The ova of Anopheles are tiny black rodshaped objects, which are deposited on the water of natural puddles, ponds, or slowly moving streams, by preference those which are well supplied with vegetation; they float, singly or attached to other objects or clustered together in patterns.
The ova of Culex, on the other hand, are deposited in any stagnant water, including cesspools, drains, cisterns, or water collected in any vessel; they float in boat-shaped masses on the surface.
Of the Physostomi, the siluroids are abundant in the estuaries and muddy waters; the habits of some of these fishes are remarkable, such as that of the males carrying the ova in their mouths till the young are hatched.
They contrast with those of the Oligochaeta and Hirudinea by reason of their frequently close association with the gonads, the same organ sometimes serving the two functions of excretion and conveyance of the ova and spermatozoa out of the body.
Males in nearly all species appear once a year, when the last female generation, the ovigerous generation, is fertilized, and a few large ova are produced to carry on the continuity of the species over the winter.Advertisement
As the ova are in many species deposited in a gelatinous tube secreted by the bodywalls, in which they are arranged (three or more together) in flaskshaped cavities, impregnation must probably take place either before or at the very moment of their being deposited.
As the animals become adult, diverticula arise on the tubes of these organs, which develop either spermatozoa or ova.
But should the "bell" swallow any of the ova, or even one of the younger embryos, these are passed back into the body cavity through the second and dorsal opening.
The development of Balanoglossus takes place according to two different schemes, known as direct and indirect, correlated with the occurrence in the group of two kinds of ova, large and small.
In subsequent generations produced by self-fertilization of the hybrids it was found that the positive character was not present in all the individuals, but that a result was obtained showing that in the formation of the reproductive cells (ova and sperms) of the hybrid, half were endowed with the positive character and half with the negative.Advertisement
The cod spawns in February, and is exceedingly prolific, the roe of a single female having been known to contain upwards of eight millions of ova, and to form more than half the weight of the entire fish.
The first of these is prevalent in countries where much and imperfectly cooked beef is eaten, and where cattle in their turn are exposed to the infection of the tapeworm ova.
B, Udonella caligorum, attached to the ova of the copepod Caligus.
The fertilized ova, provided with yolk and a shell, are next transferred to the "uterus" along which they travel to the exterior.
In these, the male organs ripen before the ova and spermatozoa may pass into the uterus before the external pore is formed (Looss).Advertisement
Some authors looking upon these as parthenogenetic ova regard the developmental cycle as one composed of an alternation of parthenogenetic and of sexual generations.
But with the return of the warmer season each male selects a territory, which he fiercely defends against all comers, especially against intruders of his own species and sex, and to which he invites all females, until the nest is filled with ova.
The small ova are crowded beneath the dorsal part of the valves.
The Trypanosomes ultimately overrun practically all parts of the body, sometimes not even the ova escaping.
In Yoldia and Nucula proxima the ova are set free in the water and the test-larvae are free-swimming, but in Nucula delphinodonta the female forms a thin-walled egg-case of mucus attached to the posterior end of the shell and in communication with the pallial chamber; in this case the eggs develop and the test-larva is enclosed.Advertisement
The Fallopian tubes receive the ova and carry them to the uterus.
The coelom opens to the exterior by ducts which are primarily genital ducts by which the ova or sperms are discharged.
As a rule no parental care is exhibited, but incubation of the developing ova within some part of the parental body, or receptacles attached to the parent, occurs in some Lamellibranchs, some Gastropods, and in Argonauta among the Cephalopods.
True viviparity, that is the development of the ova within the oviduct, is very rare, occurring only in one case among the Amphineura and in some aquatic and pulmonate Gastropoda.
Hence, when he returns to organisms, it does not surprise us that he assigns to ova and spermatozoa cell-souls, to the impregnated ovum germ-soul, to plants tissue-souls, to animals nerve-souls; or that he regards man's body and soul as born together in the impregnated ovum, and gradually evolved from the bodies and souls of lower animals.
The eggs may be laid separately invested by a chitinous envelope, or as in Ischnochiton magdalenensis they may form strings containing nearly 200,000 eggs, or the ova may be retained in the pallial groove and undergo development there, as in Chiton polii and Hemiarthrum setulosum.
One species Callistochiton viviparus is viviparous and its ova develop without a larval stage in the maternal oviduct.
Ova are developed on the median, spermatozoa on the outer wall of each genital tube.
Sipunculoids are dioecious, and the ova and spermatozoa are formed from the modified cells lining the body-cavity, which are heaped up into a low ridge running along the line of origin of the retractor muscles.
The ova are fertilized in the genital duct, and before their escape have undergone the earliest stages of segmentation.
The mass of ova thus contained in the oyster is spoken of by oyster fishers as "white spat," and an oyster containing them is said to be "sick."
While in this position the ova go through the earlier stages of development.
Many of the Himalayan forms are Indian fish which appear to go up to the higher streams to deposit their ova, and the Tibetan species as a rule are confined to the rivers on the table-land or to the streams at the greatest elevations, the characteristics of which are Tibetan rather than Himalayan.
Their experience is "that there is no half-way house between ova sown in redds and three-month-old fry.
Younger fry may do, but only where ova would do as well, and at half the cost."
The ova pass out of the mouth and are fertilized externally.
In some cases the ova, after leaving the mouth, are lodged in the oral arms, and undergo the earliest phases of their development in this situation, accumulating in the grooves that continue the angles of the mouth, and bulging the wall of the groove into sacs or pockets.
The ova are laid separately and develop in the sea FIG.
The paired ovaries discharge their products into a median coelemic chamber with lateral branches (C), often called the uterus, from which the ripe ova are discharged by a median dorsal pore into the terminal region of the rectum (cloaca).
In other species which possess receptacula seminis it is probable that fertilization is effected once only in early life before any ova pass into the uterus.
The period of gestation is thirteen months, that is to say, the ova pass into the oviducts about one month before the young of the preceding year are born.
Ova large and heavily charged with yolk, and provided with a stoutish shell.
Ova large, with much yolk and thick membrane, like those of Australasian species; embryos with slit-like blastopore and of very different ages in the same uterus, probably born all the year round.
The oviducts are long, usually more or less convoluted tubes which open posteriorly into the cloaca, while their anterior aperture is situated far forward, sometimes close to the root of the lung; their walls secrete a gelatinous substance which invests the ova as they descend.
In all the tailless batrachians (with the exception of a single known viviparous toad),the male clings to the female round the breast, at the arm-pits, or round the waist, and awaits, often for hours or days, the deposition of the ova, which are immediately fecundated by several seminal emissions.
A few batrachians retain the ova within the oviducts until the young have undergone part or the whole of the metamorphosis.
I think u will Neva Eva eva will gt ova a loss of sum1!
Apparently vacated cases with extruded pupal exuviae may contain over 50 ova.
G Gametes - Mature reproductive cells, sperm or ova in humans produced by meiosis.
To equate the removal from the woman's body and reintroduction of sperm with the removal and reintroduction of ova seems mistaken.
The finding of schistosome ova in this patient's colonic biopsies lead to an initial diagnosis of chronic schistosomiasis being considered.
A, of Helix; B, of Eolis; a, ova; b, developing spermatozoa; c, common efferent duct.
The great plateau now called the Banaz Ova was entirely or in great part Phrygian.
Thus the Howietown Fishery Company recommend their customers to stock their streams either with unhatched ova or with threemonth-old fry.
The whole tree itself is but one leaf, and rivers are still vaster leaves whose pulp is intervening earth, and towns and cities are the ova of insects in their axils.
The finding of schistosome ova in this patient 's colonic biopsies lead to an initial diagnosis of chronic Schistosomiasis being considered.
In chronic schistosomiasis, ova penetrating the bowel wall from the splanchnic venous circulation can provoke a local inflammatory response leading to granuloma formation.
Worm ova can be transferred from mom to the kittens while they're still in the womb.
This should rid the house of any ova they may have shed.
There's a chance they could have been exposed to the ova and even ingested some if the kittens were sleeping with them, or if the children didn't wash their hands after playing with them.
A follow up de-worming is usually recommended, as some worm ova are not affected by medication and must develop to the adult stage before they can be eliminated.
When a dog eats infected stools, it may be ingesting worm ova, which will then result in a case of worm infestation.
Fraternal twins develop from two separate ova released at the same time and fertilized by two separate sperm.
There is no possibility that sperm and ova can escape by these tubes not in company with coelomic fluid.
In some Syllids, such as Pionosyllis gestans, the ova are attached to the body A FIG.
Special sacs developed from the intersegmental septa lodge the developing ova and sperm.
Great part of southern and western Phrygia is drained by the Maeander with its tributaries, Sandykly Tchai (Glaucus), Banaz Tchai, Kopli Su (Hippurius), and Tchuruk Su (Lycus); moreover, some upland plains on the south, especially the Dombai Ova (Aulocra), communicate by underground channels with the IVlaeander.
The researches of Hoek have shown that in the same oyster the genital organs at one time produce ova, at another spermatozoa, and that consequently the oyster does not fertilize itself.