reproductions
In a general sense reproduction is one of the most important
concepts in biology: it means making a copy, a likeness, and
thereby providing for the continued existence of species. Although reproduction
is often considered solely in terms of the production of offspring in animals
and plants, the more general meaning has far greater significance to living
organisms.
concepts in biology: it means making a copy, a likeness, and
thereby providing for the continued existence of species. Although reproduction
is often considered solely in terms of the production of offspring in animals
and plants, the more general meaning has far greater significance to living
organisms.
protist
Cell division in protists, as in plant and animal cells, is not a simple
process, although it may superficially appear to be so. The typical mode of
reproduction in most of the major protistan taxa is asexual binary fission
process, although it may superficially appear to be so. The typical mode of
reproduction in most of the major protistan taxa is asexual binary fission
annelid worm
During asexual reproduction they break of a section of their own
body that will develope into another annelid. During sexual reproduction they
reproduce the same as a human would.
body that will develope into another annelid. During sexual reproduction they
reproduce the same as a human would.
insects
Insects are asexual, meaning that they don't reproduce with anyone but
themselves. They basically just lay eggs, this process is much faster than
sexual reproduction.
themselves. They basically just lay eggs, this process is much faster than
sexual reproduction.
amphibians
Amphibians accomplish fertilization of their eggs in a variety of ways.
External fertilization, employed by most frogs and toads, involves a male
holding a female in a pose called amplexus. In amplexus, the male releases
sperm over the female's eggs as they are laid. Less risky is the method
employed by many salamanders whereby the male deposits a packet of sperm called
a spermatophore onto the ground. The female then pulls it into her cloaca where
fertilization occurs internally. By contrast, caecilians and tailed frogs use
internal fertilization just like reptiles, birds and mammals. The male deposits
sperm directly into the female's cloaca via an intromittent organ.
External fertilization, employed by most frogs and toads, involves a male
holding a female in a pose called amplexus. In amplexus, the male releases
sperm over the female's eggs as they are laid. Less risky is the method
employed by many salamanders whereby the male deposits a packet of sperm called
a spermatophore onto the ground. The female then pulls it into her cloaca where
fertilization occurs internally. By contrast, caecilians and tailed frogs use
internal fertilization just like reptiles, birds and mammals. The male deposits
sperm directly into the female's cloaca via an intromittent organ.
mammals
About 3 percent of mammalian species are monogamous, with males only mating with
a single female each season. In these cases, males provide at least some care to
their offspring. Often, mating systems may vary within species depending upon
local environmental conditions. For example, when resources are low, males may
mate with only a single female and provide care for the young. When resources
are abundant, the mother may be able to care for young on her own and males will
attempt to sire offspring with multiple females.
a single female each season. In these cases, males provide at least some care to
their offspring. Often, mating systems may vary within species depending upon
local environmental conditions. For example, when resources are low, males may
mate with only a single female and provide care for the young. When resources
are abundant, the mother may be able to care for young on her own and males will
attempt to sire offspring with multiple females.
NON VASCULAR plants
Nonvascular plants reproduce in one of two ways. They can produce sexually or
asexually. In asexual reproduction a piece breaks off and falls. This piece them
takes root and grows into a plant
asexually. In asexual reproduction a piece breaks off and falls. This piece them
takes root and grows into a plant
gymnosperm
Gymnosperms reproduce through naked seeds. Pine trees are an example of a
gymnosperm and reproduce through pine cones.
gymnosperm and reproduce through pine cones.
angiosperm
Angiosperms reproduction like other flowers, takes place through pollination.
Angiosperms produce male and female cells that grow into seeds in the ovary or
flower. The male sex organs of Angiosperms are called stamens while a female sex
organ is called an anther.
Angiosperms produce male and female cells that grow into seeds in the ovary or
flower. The male sex organs of Angiosperms are called stamens while a female sex
organ is called an anther.