How might the fact that there are so many pollen cells help pollination occur?
406508
It's all about numbers.  More pollen increases the probability that a pollen grain will reach the stigma of a flower and initiate fertilization.
773285
Meiosis results in the production of haploid cells, with half of the regular number of chromosomes (23 singles onstead of 23 pairs). These mature into the male and female gametes, which then go off and try to find a complementary set of the opposite sex to hook up with, to become whole again. Hence meiosis allows for genetic coupling of non-identical DNA, resulting in an offspring which has the genetic material of two separate individuals. With only mitotis, there is no sharing of material, just division.\nSharing of material allows for diversity within a population. Populations which are diverse are more likely to survive variations in environment, to have people who can protect others if need be, who can lead if need be, who might have inate resistance to diseases if need be etc etc. So the whole population benefits because of the diversity afforded by meiosis. Clonal populations, produced by mitotis alone, would eventually come across a disease or natural disaster which would affect everyone equally, wiping them all out. \n\nHope this helps.
33669
These cells are called 'spores'.
494504
b)Unique to Angiosperms, flowering plants exhibit double fertilization whereby two sperm nuclei are deposited in the female gametophyte with each undergoing a fertilization event. The first sperm nucleus undergoes fusion with the egg cell nucleus forming the zygote while the second sperm nucleus undergoes fusion with the two polar nuclei of the central cell resulting in a triploid cell that proliferates through mitosis giving rise to the endosperm. The endosperm is often a source of nutrition for the developing embryo after fertilization and is often a starchy tissue.
751780
I believe it's called oogenesis, the creation of an ovum (egg cell) in the ovarian follicle of the ovary.
548379
Butterflies...They help pollinate plants
779930
Sexual reproduction in plants is described in Wikipedia as;\n\nIn flowering plants, a stamen produces gametes called pollen grains, which attach to a pistil, in which the female gametes (ovules) are located. Here, the female gamete is fertilized and develops into a seed. The ovary, which produced the gamete then grows into a fruit, which surrounds the seed(s). Plants may either self-pollinate or cross-pollinate.\n\nYou can also find out more here \nhttp://en.wikipedia.org/wiki/Plant_sexuality
277254
It has to do with the observation in nature that all living things maximize the opportunities to reproduce.  In order to have the highest liklihood of fertilizing an egg, many spermatazoa are produced.\n\nThe numbers are meant to overcome known enemies of reproduction, including non reproductive sexual activites, long periods of no sexual activity, environment of the vaginal canal is not the safest place for a spermatazoa and many are destroyed in the process and many are resorbed by the body before ever leaving.\n\nIt takes 72 days for a spermatazoan to be made, the process is ongoing and millions are made each day.\n\nThe whole purpose is to be ready when the time is right to fertilize and egg and maximize the ability to proagate the species.
408027
POLLEN TUBE\nA tube that grows from a pollen grain on the stigma of a flower down through the style into the ovary.\n\nS: (n) pollen tube ((botany) a slender tubular outgrowth from a pollen grain when deposited on the stigma for a flower; it penetrates the style and conveys the male gametes to the ovule)
581163
yea, pollinator helps to spread pollen to other flowers increasing reproduction and genetic diversity, and the poliinator gets food out of the deal
77951
There are many different types of "sex" practiced in the plant and animal kingdoms besides the type we humans are familiar with. There are species in which the fathers get pregnant (like seahorses). There are species where males will turn into females (or vice-versa) if it would help the species survive. There are lots of examples of parthenogensis (virgin birth). There are cases where a single individual (like a plant) will pollinate itself, but others where biology tries to prevent this, although the plant might be hermaphroditic. There are plants which have several different reproduction mechanisms; a piece of the root can produce a new individual, for example. Some organisms can engage in both sexual and asexual reproduction as well; earthworms, honeybees, and geckos can asexually reproduce. There are species with 3 or even more sexes (like the clam shrimp in the US, for example, which has 3 sexes, or possibly  the New Zealand lizard the tuatara, which appears to have 4 sexes. There are species where males just fertilize the eggs deposited by the female in some location (most fish). Bacteria and viruses reproduce in strange ways, by dividing, or by taking over the reproduction mechanism of some other organism. \n\nThe astounding variety of "sex" and/or reproduction just goes on and on and on. We are still learning about the amazing diversity of life on this planet. \n\nIf and when we ever discover life on other planets, you can be sure that they will have different ways to reproduce, that may or may not have anything to do with what we might recognize as sex, and probably using mechanisms we cannot even imagine.
501017
An anther and a filament.  The anther makes pollen which contain the male's reproductive cells.
641257
In angiosperms, the sporophyte (2n) stage predominates and includes the\nvegetative parts of the plant and even the various parts of the flower. The process involving meiosis, which converts\ndiploid sporocytes (or spore mother cells) into haploid (n) spores, is termed sporogenesis. Sporogenesis occurs in the\nanthers of stamens and the ovules of pistils. Angiosperms, and seed plants in general, are heterosporous. This means\nthat two different kinds of spores, microspore and megaspore, are produced by the sporophyte. Consequently,\nheterosporous organisms exhibit separate male and female gametophytes. The microspore gives rise to the\nmicrogametophyte (or male gametophyte), and the megaspore gives rise to the megagametophyte (or female\ngametophyte).
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producers or angiosperms.
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In biology, meiosis is the process that allows one diploid cell to divide in a special way to generate haploid cells in eukaryotes. The word "meiosis" comes from the Greek meioun, meaning "to make smaller," since it results in a reduction in chromosome number.\n\nMeiosis is essential for sexual reproduction. It therefore occurs in most eukaryotes, including single-celled organisms. A few eukaryotes, notably the Bdelloid rotifers, have lost the ability to carry out meiosis and acquired the ability to reproduce by parthenogenesis. Meiosis does not occur in archaea or prokaryotes, which reproduce by asexual cell division processes.\n\nDuring meiosis, the genome of a diploid germ cell, which is composed of long segments of DNA called chromosomes, undergoes DNA replication followed by two rounds of division, resulting in haploid cells called gametes. Each gamete contains one complete set of chromosomes, or half of the genetic content of the original cell. These resultant haploid cells can fuse with other haploid cells of the opposite gender or mating type during fertilization to create a new diploid cell, or zygote. Thus, the division mechanism of meiosis is a reciprocal process to the joining of two genomes that occurs at fertilization. Because the chromosomes of each parent undergo genetic recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA. In other words, meiosis is the process that produces genetic variation.\n\nBiochemically, meiosis uses some of the same mechanisms employed during mitosis to accomplish the redistribution of chromosomes. There are several features unique to meiosis, most importantly the pairing and recombination between homologous chromosomes, which enable them to separate from each other.\n\nMeiosis facilitates stable sexual reproduction. Without the halving of ploidy, or chromosome count, fertilization would result in zygotes that have twice the number of chromosomes than the zygotes from the previous generation. Successive generations would have an exponential increase in chromosome count, resulting in an unwieldy genome that would cripple the reproductive fitness of the species. Polyploidy, the state of having three or more sets of chromosomes, also results in developmental abnormalities or lethality.\n\nMost importantly, however, meiosis produces genetic variety in gametes that propagate to offspring. Recombination and independent assortment allow for a greater diversity of genotypes in the population. As a system of creating diversity, meiosis allows a species to maintain stability under environmental changes.
1129040
yes, each pistil can be fertilized by different pollen, but generally the properties of the fruit is dependant on the genes of the mother - the flesh of the fruit is mother tissue, so the dna of the seed is not affecting this much. that is why all the apples, cherries on one tree are quite the same even it they were pollinated by different "fathers" - but if u grow the seeds in mature trees, they may differ in their various properties.
456475
It depends on the flower but they can attract moths, bees, beetles and bats. The reason for the scent is to attract the pollinator and the nectar is a reward for pollinating the flowers. Bee flowers are usually blue or yellow.