—. Learn more. Unlike most animals, dolphins have been seen to engage in sex as a pleasurable act. —, the life cycle, development, or developmental history of an organism. —, the property of some organisms, as fireflies, of producing light. Females, in an evolutionary tactic to fend off unwanted mating, developed a curved vagina. —, an obsolete biological theory that stated that sperm contained the preformed germ or the embryo. any of several processes of asexual reproduction. From the smallest organisms to the largest, sexual intercourse is simply the process of delivering sperm into the female, although the process varies widely. The male intromittent organ in flukes is called the copulatory apparatus (named after its action in copulation) and rests inside a muscularized sac called the cirrus sac. Fertilization definition, an act, process, or instance of fertilizing. les deux corps caverneux (corpora cavernosa penis), et; le corps spongieux (corpus spongiosum penis) sous eux. Even Stranger Forms of Sexual Intercourse. —, the effect on the growth and reproduction of plants or animals of timed exposures to varied temperatures. Think that is strange? the biological theory of Ivan Michurin who asserted the fundamental influence of environmental factors on heredity in contradiction of orthodox genetics. the study of the formation and structure of animal ova. a relationship of mutual dependency between two living organisms. Fertilization is the fusion of two gametes. —, a form of reproduction in which dissimilar gametes, often dirfering in size, unite. the state or quality of being bilaterally symmetrical, as certain organisms. When two flukes engage in sexual intercourse, each fluke flexes their cirrus sac, exposing their copulatory apparatus. the study of the form and structure of plants and animals. Ovoviviparity shows internal fertilization of eggs typically via copulation. However, sexual intercourse is almost as varied as the animal kingdom itself, and occurs in some form or another in most of the large groups of organisms. selective breeding to develop strains with particular characteristics. the living together of two organisms in a relationship that is destructive to one and has no effect on the other. the study of electrical activity in organisms and of the effect of electricity on them. the living together of two dissimilar organisms; the relationship may be beneficial to both (. —. Also called, the branch of biology that studies heredity and variation in plants and animals. Male dolphins have a penis, which they use to deposit their sperm in the female’s vagina. —. A. The scientific process differs from other ways of learning in that science follows the scientific method, which is characterized by observation, development of a hypothesis, experimentation and data collection, and … growth or movement of an organism in response to an electric current. the branch of microbiology that studies the rate of growth or inhibition exhibited by individual organisms in various plateculture media. —. —. any of the sciences that deal with living organisms. a gamete differing from the gamete with which it unites in sex, structure, size, or form. —, the process in which a zymogen becomes an enzyme, as in the fermentation process. —, progressive evolution, leading to the development of a new form, as can be seen through successive generations. Fertilization of eggs takes place when they are in the oviducts and sustain to develop here, and are supplied by the egg yolk in their egg. Biology is the scientific study of life, and it consists of many disciplines. Fluke are hermaphroditic organisms, containing both male and female reproductive organs. the branch of ecology that studies the relation of an organism to its environment. —, the branch of biology that studies the growth, morphology, and physiology of organs. —. 2. —, the living together of two organisms in a relationship that is beneficial to one and destructive to the other. growth or movement determined by contact with a solid. Cf. Find 14 ways to say secretion, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. biology: Aristotelian concepts …means of reproduction, including the abiogenetic origin of life from nonliving mud, a belief held by Greeks of that time. Sexual Intercourse. Also, production of similar reproductive parts from stocks that are dissimilar, as with certain hydroids. —. Organsims that reproduce using this method must time the release of their gametes to maximize the production of new offspring. Why would sexual intercourse become a pleasurable act, evolutionarily? floral definition: 1. made of flowers, or decorated with pictures of flowers: 2. made of flowers, or decorated with…. —, the living together of two organisms in a relationship that is beneficial to one and has no effect on the other. Also, connection between parts that have branched off from each other at some earlier point. Also, the union of sexually differentiated reproductive cells. —. Also called, the effect on the growth and reproduction of plants or animals of varying exposures to light and darkness. Copulation, Egg-laying and Fertilization”, in Journal of Morphology, volume 22, number 2, Philadelphia, Pa.: Wistar Institute of Anatomy and Biology, published 1911, page 334: The spermatophores begin to ejaculate immediately after leaving the penis and the whole process is completed in a very few seconds. 2. Sexual intercourse is the natural and most common way to make a baby.It involves a man and woman having sex without birth control until the man ejaculates, or releases, semen from his penis into the woman's vagina.The semen, which has sperm in it (which is made in his testicles), moves to the Fallopian tubes, and if it finds an ovum on its way, it will try to fertilize it. —, the property or process of self-fertilization, as in certain plants and animals. This is known as mutual cross-fertilization and enhances both organism’s chances of passing on their genetics. At the same time, the male ejaculates his sperm into the water column. —, the science that studies live and fossil spores, pollen grains, and other microscopic plant structures. —, the branch of biology that studies the structural basis of heredity and variation in living organisms from the points of view of cytology and genetics. Online Dictionaries: Definition of Options|Tips Options|Tips C. Ovoviviparous animals rely on external fertilization. any form of growth, especially as a product of cell division. the scientific study of recently living plants and animals. —, the process whereby colloids and crystalloids separate in solution by diffusion through a membrane. Beyond the penis or other intromittent organ entering the female and depositing sperm, the process of sexual intercourse varies widely by animal. This is often called vaginal intercourse or vaginal sex. Male sharks have long intromittent organs that hang near their cloaca, or urogenital opening. Like many animals, sexual intercourse between dolphins is not distributed equally, and females are often battled over. —. the branch of biology that studies longevity. —, the science or study of biotypes, or organisms sharing the same hereditary characteristics. —. See more. the theories of the 20th-century Russian geneticist Trofim Lysenko, who argued that somatic and environmental factors have a greater influence on heredity than orthodox genetics has found demonstrable; now generally discredited. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. observation of the development of an embryo inside an egg by means of an ooscope. Near the surface she turns, and the males rub her underside, releasing eggs. —, the study of protozoa, especially of those that cause disease. She has a Bachelor of Science in Biology and a Master of Education. The variations of sexual intercourse are nearly infinite in the animal kingdom, and some of them are remarkably strange. Females have different sexual organs that produce female gametes, usually called eggs. “Sexual Intercourse.” Biology Dictionary. the branch of biology that studies the origin and development of acquired characteristics. Sex definition, the male, female, or intersex division of a species, especially as differentiated with reference to the reproductive functions. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Dolphins are also one of the only animals capable of raping members of its own species, which large males sometimes use as a threat against smaller males and females. a theory or doctrine based on a biological viewpoint. Also called, the tendency to eat a wide variety of food. Botany, zoology, and ecology are all branches of biology. —. During external fertilization, gametes are broadcast into the environemtn, and must find their way to each other through shear numbers. theories and doctrines of Ernst Haeckel (1834-1919), German biologist and philosopher, especially the notion “ontogeny recapitulates phylogeny.” —. As opposed to external fertilization, internal fertilization through sexual intercourse increases the change that fertilization will occur among the gametes. Asexual reproduction takes place by means of spores and sexual reproduction takes place by means of gametic copulation, somatic copulation, and Spermatization. Ducks are worse. —. See also. a gamete that is not sexually differentiated from the other gamete with which it unites. The organ of copulation and urination in the male; formed of three columns of erectile tissue, two arranged laterally on the dorsum (corpora cavernosa penis) and one median ventrally (corpus spongiosum penis); the urethra traverses the latter; the extremity (glans penis) is formed by an expansion of the corpus spongiosum and is more or less completely covered by a free fold of skin (prepuce). —. the formation of chemical compounds by living organisms, either by synthesis or degradation. —. —, growth or motion in response to a chemical stimulus. —, the biological process of imitative homodynamy. Aristotle is properly recognized as the originator of the scientific study of life. the growth of new scales, hair, plumage, etc. B. Oviparity requires copulation. —, the history or science of the development or evolution of vital activities in the individual and the genesis of organic functions; a division of ontogeny. —, the character of being made up of a number of smaller organisms that are acting as a colony. —, the branch of biology that studies the relation of soil management to the nutrition, growth, and erop yield of plants. Which of the following happened? “Sexual Intercourse.”, Biologydictionary.net Editors. —, similarity in the form or structure of organisms that belong to a different species or genus. —, the synthesis of complex organic substances from carbon dioxide, water, and inorganic salts, with sunlight as the energy source and a catalyst such as chlorophyll. Hermaphrodite Definition. Biologydictionary.net Editors. Human reproductive system, organ system by which humans reproduce and bear live offspring. Also, the study of the effects of environment on an organism’s growth and behavior. The organ of copulation in the male; it is formed of three columns of erectile tissue, two arranged laterally on the dorsum (corpora cavernosa penis) and one median below (corpus spongiosum); the urethra traverses the latter; the extremity (glans penis) is formed by an expansion of the corpus spongiosum, and is more or less completely covered by a free fold of skin (preputium). —, the process of reproduction by the joining of gametes, a form of sexual reproduction. The scientific study of life and of living organisms. A. Viviparity requires sexual intercourse. For instance, a male shark penetrates his clasper into the female to release sperms. —, involuntary response or reaction to the touch of outside objects or bodies, as in motile cells. —. In biology, mating is the pairing of either opposite-sex or hermaphroditic organisms, usually for the purposes of sexual reproduction.Some definitions limit the term to pairing between animals, while other definitions extend the term to mating in plants and fungi. Below are a few examples. 3. a branch of biology that studies animals under germ-free conditions. —, the formative process of the ovum in preparation for fertilization and subsequent development. the biological process of conjugation; the union of cells or gametes. the theory that an organism is fully formed at conception and that reproduction is thereafter simply a process of growth. the state of being zygomorphic, or bilaterally symmetrie, or divisible into symmetrical halves by one plane only. Many duck penises are spiraled and barbed, which helps them stay in if the male is able to mount the female. the living together of two organisms in a mutually destructive relationship. alternation of generations across reproductive cycles. —, growth or motion in response to light. the process of gestation taking place in the womb from conception to birth. Sharks use a special muscular sac under the skin to flush sperm out of the clasper with seawater it collects near the pelvic fins. Also called, the existence of a plant or animal in two or more distinct forms during a life cycle. But he had never connected these scientific deductions as to the origin of man as an animal, as to reflex action, I gave over attempts on heavy study, such as jurisprudence, political economy, and, Darwin in his remarks relative to the degeneration of CULTIVATED types of animals through the action of promiscuous breeding, brings Gobineau support from the realm of, "I understood quite a good deal of First Principles, but his, Of course all the students in the crammer's, This was especially true of the sciences which we know as, Every day he seemed to become more interested in, عالم بيولوجي، إخْتِصاصي في عِلْمِ الأحياء, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Biologie, Géosciences, Agroressources, Environnement, Biologisch Medizinisches Forschungszentrum, Biologische Bundesanstalt, Bundessortenamt and Chemical Industry, Biologische Station Westliches Ruhrgebiet, Biology and Biotechnology Research Program, Biology and Diseases of the Posterior Eye, Biology Intensive Orientation for Students, Biology of Blood and Marrow Transplantation, Biology Teachers Association of New Jersey, Biology, Chemistry and Environmental Science, Biology, Education Screening Chemoprevention and Treatment, Biology, Electronics, Aesthetics, Mechanics.