Types: self-pollination and cross-pollination

An egg cell in an ovule of a flower may be fertilized by a sperm cell derived from a pollen grain produced by that same flower or by another flower on the same plant, in either of which two cases fertilization is said to be due to self-pollination (autogamy); or, the sperm may be derived from pollen originating on a different plant individual, in which case the process is called cross-pollination (heterogamy). Both processes are common, but cross-pollination clearly has certain evolutionary advantages for the species: the seeds formed may combine the hereditary traits of both parents, and the resulting offspring generally are more varied than would be the case after self-pollination. In a changing environment, some of the individuals resulting from cross-pollination still may be found capable of coping with their new situation, ensuring survival of the species, whereas the individuals resulting from self-pollination might all be unable to adjust. Self-pollination, or selfing, although foolproof in a stable environment, thus is an evolutionary cul-de-sac. There also is a more direct, visible difference between selfing and outbreeding (cross-pollination): in those species where both methods work, cross-pollination usually produces more, and better quality, seeds. A dramatic demonstration of this effect is found with hybrid corn (maize), a superior product that results from cross-breeding of several especially bred lines.

 

Mechanisms that prevent self-pollination

STRUCTURAL

Not surprisingly, many species of plants have developed mechanisms that prevent self-pollination. Some—e.g., date palms (Phoenix dactylifera) and willows (Salix species)—have become dioecious; that is, some plants produce only “male” (staminate) flowers, with the rest producing only “female” (pistillate or ovule-producing) ones. In species in which staminate and pistillate flowers are found on the same individual (monoecious plants) and in those with hermaphroditic flowers (flowers possessing both stamens and pistils), a common way of preventing self-fertilization is to have the pollen shed either before or after the period during which the stigmas on the same plant are receptive, a situation known as dichogamy. The more usual form of dichogamy, which is found especially in such insect-pollinated flowers as fireweed (Epilobium angustifolium) and salvias (Salvia species), is protandry, in which the stamens ripen before the pistils. Protogyny, the situation in which the pistils mature first, occurs in arum lilies and many wind-pollinated plants, such as grasses—although several grasses are self-pollinated, including common varieties of wheat, barley, and oats. Avocado has both protogynous and protandrous varieties, and these often are grown together to encourage cross-fertilization. A structural feature of flowers that discourages selfing is heterostyly, or variation in the length of thestyle (neck of the pistil). This occurs in the common primrose (Primula vulgaris) and species of woodsorrel (Oxalis) and flax. In most British primrose populations, for example, approximately half the individuals have so-called “pin” flowers, which possess short stamens and a long style, giving the stigma a position at the flower’s mouth, whereas the other half have “thrum” flowers, in which the style is short and the stamens are long, forming a “thrumhead” at the opening of the flower. Bees can hardly fail to deposit the pollen they receive from one type of flower onto the stigmas of the other type. The genetic system that regulates flower structure in these primroses is so constituted that cross-pollination automatically maintains a 50:50 ratio between pins and thrums. In the flowers of purple loosestrife(Lythrum salicaria), the stamens and styles are of three different lengths to limit self-fertilization.

 

CHEMICAL

Chemical self-incompatibility is another device for preventing self-fertilization. In this phenomenon, which depends on chemical substances within the plant, the pollen may fail to grow on a stigma of the same flower that produced it or, after germination, the pollen tube may not grow normally down the style to effect fertilization. The process is controlled genetically; it need not be absolute and can change in degree during the flowering season. Not surprisingly, chemical incompatibility usually is not found in those plants that have strong structural or temporal barriers against self-pollination. Formation of one such mechanism during evolution apparently was enough for most plant species.

 

Mechanisms that permit self-pollination

In many instances, successful self-pollination takes place at the end of a flower’s life-span if cross-pollination has not occurred. Such self-pollination may be achieved by curving of stamens or style as occurs, for example, in fireweed. It can be an evolutionary advantage when animal pollinators are temporarily scarce or when the plants in a population are widely scattered. Under such circumstances, selfing may tide the species over until better circumstances for outbreeding arrive. For this reason, selfing is common among annual plants; these often must produce an abundance of seed for the rapid and massive colonization of any bare ground that becomes available. If, in a given year, an annual plant were to produce no seed at all, survival of the species might be endangered. A persistent habit of self-pollination apparently has been adopted successfully by some plant species whose natural pollinators have died out. Continued selfing also is practiced by many food-crop plants. Some of these plants are cleistogamous, meaning that the flowers fail to open, an extreme way of ensuring self-pollination. A similar process is apomixis, the development of an ovule into a seed without fertilization. Apomixis is easily demonstrated in lawn dandelions, which produce seeds even when stamens and styles are cut off just before the flowers open. Consistent apomixis has the same pros and cons as continued selfing. The offspring show very little genetic variability, but there is good survival if the species is well adapted to its habitat and if the environment does not change.

 

Agents of pollen dispersal

Insects

BEETLES AND FLIES

The ancient principle of trapping insects as a means of ensuring pollination was readopted by some advanced families (e.g., orchids and milkweeds), and further elaboration perfected the flower traps of primitive families. The cuckoopint (Arum maculatum), for example, attracts minute flies, which normally breed in cow dung, by means of a fetid smell. This smell is generated in early evening, along with considerable heat, which helps to volatilize the odour ingredients. The flies visiting the plant, many of which carry Arum pollen, enter the floral trap through a zone of bristles and then fall into a smooth-walled floral chamber from which escape is impossible. Gorging themselves on a nutritious stigmatic secretion produced by the female flowers at the base of the chamber, the flies effect cross-pollination. Late at night, when the stigmas no longer function, the male flowers, situated much higher on the floral column, proceed to bombard the flies with a rain of pollen. The next day, when smell, heat, and food are gone, the prisoners, “tarred” with stigmatic secretion and “feathered” with pollen, are allowed to escape by a wilting of the inflorescence (flower cluster). Usually the escaped flies are soon recaught by another inflorescence, which is still in the smelly, receptive stage, and cross-pollination again ensues. Superb timing mechanisms underlie these events. The heat-generating metabolic process in the inflorescence is triggered by a hormone, calorigen, originating in the male flower buds only under the right conditions. The giant inflorescences of the tropical plant Amorphophallus titanumsimilarly trap large carrion beetles.

In general, trap flowers victimize beetles or flies of a primitive type. Although beetles most likely were involved as pollinators when flowering plants as a group were born, their later performance in pollination has been disappointing. Some modern beetles do visit smelly flowers of an open type, such as elderberry and hawthorn, but with few exceptions they are still mainly pollen eaters. Flies as a group have become much more diversified in their habits than beetles have. Female short-tongued flies may be deceived by open-type flowers with carrion smells—e.g., the flowers of Stapelia and Rafflesia.Mosquitoes with their long tongues are effective pollinators of certain orchids (Habenaria species) in North American swamps. In Europe, the bee fly (Bombylius) is an important long-tongued pollinator. Extremely specialized as nectar drinkers are certain South African flies; for example, Megistorhynchus longirostris, which has a tongue that is 60 to 70 mm (2.3 to 2.7 inches) long.

The voraciousness of flower beetles demonstrates the futility of enticing insect pollinators solely with such an indispensable material as pollen. As a defensive strategy, certain nectar-free flowers that cater to beetles and bees—such as wild roses, peonies, and poppies—produce a superabundance of pollen. Other plants—e.g., Cassia—have two types of stamens, one producing a special sterile pollen used by insects as food, the other yielding normal pollen for fertilizing the ovules. Other flowers contain hairs or food bodies that are attractive to insects.

BEES

In the modern world, bees are probably the most important insect pollinators. Living almost exclusively on nectar, they feed their larvae pollen and honey (a modified nectar). To obtain their foods, they possess striking physical and behavioral adaptations, such as tongues as long as 2.5 cm (1 inch), hairy bodies, and (in honeybees and bumblebees) special pollen baskets. The Austrian naturalist Karl von Frisch has demonstrated that honeybees, although blind to red light, distinguish at least four different colour regions, namely, yellow (including orange and yellow green), blue green, blue (including purple and violet), and ultraviolet. Their sensitivity to ultraviolet enables bees to follow nectar-guide patterns not apparent to the human eye. They are able to taste several different sugars and also can be trained to differentiate between aromatic, sweet, or minty odours but not foul smells. Fragrance may be the decisive factor in establishing the honeybee’s habit of staying with one species of flower as long as it is abundantly available. Also important is that honeybee workers can communicate to one another both the distance and the direction of an abundant food source by means of special dances.

Bee flowers, open in the daytime, attract their insect visitors primarily by bright colours; at close range, special patterns and fragrances come into play. Many bee flowers provide their visitors with a landing platform in the form of a broad lower lip on which the bee sits down before pushing its way into the flower’s interior, which usually contains both stamens and pistils. The hermaphroditism of most bee flowers makes for efficiency, because the flower both delivers and receives a load of pollen during a single visit of the pollinator, and the pollinator never travels from one flower to another without a full load of pollen. Indeed, the floral mechanism of many bee flowers permits only one pollination visit. The pollen grains of most bee flowers are sticky, spiny, or highly sculptured, ensuring their adherence to the bodies of the bees. Since one load of pollen contains enough pollen grains to initiate fertilization of many ovules, most individual bee flowers produce many seeds.

Examples of flowers that depend heavily on bees are larkspur, monkshood, bleeding heart, and Scotch broom. Alkali bees (Nomia) andleaf-cutter bees (Megachile) are both efficient pollinators of alfalfa; unlike honeybees, they are not afraid to trigger the explosive mechanism that liberates a cloud of pollen in alfalfa flowers. Certain Ecuadorian orchids (Oncidium) are pollinated by male bees of the genus Centris; vibrating in the breeze, the beelike flowers are attacked headlong by the strongly territorial males, who mistake them for competitors. Other South American orchids, nectarless but very fragrant, are visited by male bees (Euglossa species) who, for reasons not yet understood, collect from the surface of the flowers an odour substance, which they store in the inflated parts of their hindlegs.

WASPS

Few wasps feed their young pollen or nectar. Yellow jackets, however, occurring occasionally in large numbers and visiting flowers for nectar for their own consumption, may assume local importance as pollinators. These insects prefer brownish-purple flowers with easily accessible nectar, such as those of figwort. The flowers of some Mediterranean and Australian orchids mimic the females of certain wasps (of the families Scoliidae and Ichneumonidae) so successfully that the males of these species attempt copulation and receive the pollen masses on their bodies. In figs, it is not the pollinator’s sexual drive that is harnessed by the plant but the instinct to take care of the young; tiny gall wasps (Blastophaga) use the diminutive flowers (within their fleshy receptacles) as incubators.

BUTTERFLIES AND MOTHS

The evolution of moths and butterflies (Lepidoptera) was made possible only by the development of the modern flower, which provides their food. Nearly all species of Lepidoptera have a tongue, or proboscis, especially adapted for sucking. The proboscis is coiled at rest and extended in feeding. Hawkmoths hover while they feed, whereas butterflies alight on the flower. Significantly, some butterflies can taste sugar solutions with their feet. Although moths, in general, are nocturnal and butterflies are diurnal, a colour sense has been demonstrated in representatives of both. Generally, the colour sense in Lepidoptera is similar to that of bees, but swallowtails and certain other butterflies also respond to red colours. Typically, colour and fragrance cooperate in guiding Lepidoptera to flowers, but in some cases there is a strong emphasis on just one attractant; for example, certain hawkmoths can find fragrant honeysuckles hidden from sight.

Typical moth flowers—e.g., jimsonweed, stephanotis, and honeysuckle—are light-coloured, often long and narrow, without landing platforms. The petals are sometimes fringed; the copious nectar is often in a spur. They are open and overwhelmingly fragrant at night. Butterfly flowers—e.g., those of butterfly bush, milkweed, and verbena—are conspicuously coloured, often red, generally smaller than moth flowers, but grouped together in erect, flat-topped inflorescences that provide landing space for the butterflies.

Important pollinating moths are the various species of the genus Plusia, sometimes occurring in enormous numbers, and the hummingbird hawkmoth (Macroglossa), which is active in daylight. A small moth, Tegeticula maculata, presents an interesting case. It is totally dependent on yucca flowers, in whose ovules its larvae develop. Before depositing their eggs, the females pollinate the flowers, following an almost unbelievable pattern of specialized behaviour, which includes preparing a ball of pollen grains and carrying it to the stigma of the plant they are about to use for egg laying.

Wind

Although prevalent in the primitive cycads and in conifers, such as pine and fir, wind pollination (anemophily) in the flowering plants must be considered as a secondary development. It most likely arose when such plants left the tropical rain forest where they originated and faced a more hostile environment, in which the wind weakened the effectiveness of smell as an insect attractant and the lack of pollinating flies and beetles also made itself felt. Lacking in precision, wind pollination is a wasteful process. For example, one male plant of Mercurialis annua, a common weed, produces 1.25 billion grains of pollen to be dispersed by the wind; a male sorrel plant produces 400 million. Although, in general, the concentration of such pollen becomes very low about one-fourth mile (0.4 km) from its source, nonetheless in windy areas it can cover considerable distances. Pine pollen, for example, which is naturally equipped with air sacs, can travel up to 500 miles (800 km) although the grains may lose their viability in the process. Statistically, this still gives only a slim chance that an individual stigma will be hit by more than one or two pollen grains. Also relevant to the number of pollen grains per stigma is the fact that the dry, glueless, and smooth-surfaced grains are shed singly. Since the number of fertilizing pollen grains is low, the number of ovules in a single flower is low and, as a consequence, so is the number of seeds in each fruit. In hazel, walnut, beech, and oak, for example, there are only two ovules per flower, and, in stinging nettle, elm, birch, sweet gale, and grasses, there is only one. Wind-pollinated flowers are inconspicuous, being devoid of insect attractants and rewards, such as fragrance, showy petals, and nectar. To facilitate exposure of the flowers to the wind, blooming often takes place before the leaves are out in spring, or the flowers may be placed very high on the plant. Inflorescences, flowers, or the stamens themselves move easily in the breeze, shaking out the pollen, or the pollen containers (anthers) burst open in an explosive fashion when the sun hits them, scattering the pollen widely into the air. The stigmas often are long and divided into arms or lobes, so that a large area is available for catching pollen grains. Moreover, in open areas wind-pollinated plants of one species often grow together in dense populations. The chance of self-pollination, high by the very nature of wind pollination, is minimized by the fact that many species are dioecious or (like hazel) have separate male and female flowers on each plant. Familiar flowering plants relying on wind pollination are grasses, rushes, sedges, cattail, sorrel, lamb’s-quarters, hemp, nettle, plantain, alder, hazel, birch, poplar, and oak. (Tropical oaks, however, may be insect-pollinated.)

Birds

Because the study of mechanisms of pollination began in Europe, where pollinating birds are rare, their importance is often underestimated. In fact, in the tropics and the southern temperate zones, birds are at least as important as pollinators as insects are, perhaps more so. About a third of the 300 families of flowering plants have at least some members with ornithophilous (“bird-loving”) flowers—i.e., flowers attractive to birds. Conversely, about 2,000 species of birds, belonging to 50 or more families, visit flowers more or less regularly to feed on nectar, pollen, and flower-inhabiting insects or spiders. Special adaptations to this way of life, in the form of slender, sometimes curved, beaks and tongues provided with brushes or shaped into tubes, are found in over 1,600 species of eight families:hummingbirds, sunbirds (see The Rodent That Acts Like a Hippo and Other Examples of Convergent Evolution), honeyeaters, brush-tongued parrots, white-eyes, flower-peckers, honeycreepers (or sugarbirds), and Hawaiian honeycreepers such as the iiwi. Generally, the sense of smell in birds is poorly developed and not used in their quest for food; instead, they rely on their powerful vision and their colour sense, which resembles that of human (ultraviolet not being seen as a colour, whereas red is). Furthermore, the sensitivity of the bird’s eye is greatest in the middle and red part of the spectrum. This is sometimes ascribed to the presence in the retina of orange-red drops of oil, which together may act as a light filter.

Although other explanations have been forwarded, the special red sensitivity of the bird eye is usually thought to be the reason why so many bird-pollinated flowers are of a uniform, pure red colour. Combinations of complementary colors, such as orange and blue, or green and red, also are found, as are white flowers. As might be expected, bird flowers generally lack smell and are open in the daytime; they are bigger than most insect flowers and have a wider floral tube. Bird flowers also are sturdily constructed as a protection against the probing bill of the visitors, with the ovules kept out of harm’s way in an inferior ovary beneath the floral chamber or placed at the end of a special stalk or behind a screen formed by the fused bases of the stamens. The latter, often so strong as to resemble metal wire, are usually numerous, brightly coloured, and protruding, so that they touch a visiting bird on the breast or head as it feeds. The pollen grains often stick together in clumps or chains, with the result that a single visit may result in the fertilization of hundreds of ovules.

In the Americas, where hummingbirds usually suck the nectar of flowers on the wing, ornithophilous flowers (e.g., fuchsias) are often pendant and radially symmetrical, lacking the landing platform of the typical bee flower. In Africa and Asia, bird flowers often are erect and do offer their visitors, which do not hover, either a landing platform or special perches in the form of small twigs near the flower . Pollinating birds are bigger than insects and have a very high rate of metabolism. Although some hummingbirds go into a state resembling hibernation every night, curtailing their metabolism drastically, others keep late hours. Thus, in general, birds need much more nectar per individual than insects do. Accordingly, bird flowers produce nectar copiously—a thimbleful in each flower of the coral tree, for example, and as much as a liqueur glassful in flowers of the spear lily (Doryanthus). Plants bearing typical bird flowers are cardinal flower, fuchsia, red columbine, trumpet vine, hibiscus, strelitzia, and eucalyptus, and many members of the pea, orchid, cactus, and pineapple families.

 

Mammals

In Madagascar, the mouse lemurs (Microcebus), which are only ten centimetres (four inches) long, obtain food from flowers, and in Australia the diminutive marsupial honey possums and pygmy possums also are flower specialists. Certain highly specialized tropical bats, particularlyMacroglossus and Glossophaga, also obtain most or all of their food from flowers. The Macroglossus (big-tongued) species of southern Asia and the Pacific are small bats with sharp snouts and long, extensible tongues, which carry special projections (papillae) and sometimes a brushlike tip for picking up a sticky mixture of nectar and pollen. Significantly, they are almost toothless. Colour sense and that sonar sense so prominent in other bats, seem to be lacking. Their eyesight is keen but, since they feed at night, they are probably guided to the flowers principally by their highly developed sense of smell. The bats hook themselves into the petals with their thumb claws and stick their slender heads into the flowers, extracting viscid nectar and protein-rich pollen with their tongues. The plants involved have, in the process of evolution, responded to the bats by producing large (sometimes huge) amounts of these foods. One balsa-tree flower, for example, may contain a full 10 grams (0.3 ounce) of nectar, and one flower from a baobab tree has about 2,000 pollen-producing stamens. Some bat flowers also provide succulent petals or special food bodies to their visitors. Another striking adaptation is that the flowers are often placed on the main trunk or the big limbs of a tree (cauliflory); or, borne on thin, ropelike branches, they dangle beneath the crown (flagelliflory). The pagoda shape of the kapok tree serves the same purpose: facilitation of the bat’s approach. Characteristics of the flowers themselves include drab colour, large size, sturdiness, bell-shape with wide mouth and, frequently, a powerful rancid or urinelike smell. The giant saguaro cactus and the century plant (Agave) are pollinated by bats, although not exclusively, and cup-and-saucer vine (Cobaea scandens) is the direct descendant of a bat-pollinated American plant. Calabash, candle tree, and areca palm also have bat-pollinated flowers.

 

Water

Although pollen grains can be made to germinate in aqueous sugar solutions, water alone in most cases has a disastrous effect on them. Accordingly, only a very few terrestrial plants, such as the bog asphodel of the Faroes, use rainwater as a means of pollen transport. Even in aquatic plants, water is seldom the true medium of pollen dispersal. Thus, the famous Podostemonaceae, plants that grow only on rocks in rushing water, flower in the dry season when the plants are exposed; pollination occurs with the aid of wind or insects or by selfing. Another aquatic plant, ribbon weed, sends its male and female flowers to the surface separately. There, the former transform themselves into minute sailboats, which are driven by the wind until they collide with the female flowers. In the Canadian waterweed, and also in pondweed (Potamogeton) and ditch grass (Ruppia), the pollen itself is dispersed on the water’s surface; it is, however, still water-repellent. True water dispersal (hydrophily), in which the pollen grains are wet by water, is found only in the hornworts and eelgrasses.

Pollination agents – insects, birds and bats !!

Pollination agents – insects, birds and bats !!

Insect Pollination

E.g., bees, moths, butterflies
It is the most sure and least wasteful method. Insects, visit the flowers not to effect pollination but to collect nectar, edible pollen or for shelter. As the insect visits a flower, its body gets dusted with pollen grains. When the loaded insect visits another flower, its body brushes against the stigma and inadvertently transfers the pollen to it bringing about pollination.

Some of the characteristic features of insect pollinated flowers are

·         The flowers are large, conspicuous and brightly coloured.

·         When flowers are small, they aggregate in the form of inflorescence.

·         The flowers have a pleasant fragrance and sweet nectar.

·         Pollen grains are usually rough and sticky and often show spinous outgrowths.

Bird Pollination

The common bird pollinators are humming birds, sun – birds and honey – eaters. Birds can obtain only one staple food from flowers and that is nectar. The bird pollinated flowers have funnel – shaped or tubular corollas which are brightly coloured. The floral parts are commonly leathery and they produce copious amount of nectar and large quantities of pollen which are sticky.

Common bird – pollinated plants are Bombax (red silk cotton), Erythrina (coral tree) Bigonia, Lobelia, Agave.

Bat Pollination

Bats bring about pollination only in the tropics. Bats are nocturnal animals and the flowers they visit are large and emit a strong odour. They move very fast and transport pollen to long distances. Bat pollinated flowers generally produce more nectar than ornithophilous flowers. They also have a large number of stamens.

Methods of pollination

Image: Tūī on flax flowers

Flowering plants need to get pollen from one flower to another, either within a plant for self-pollination or between plants of the samespecies for cross-pollination to occur. However, pollen can’t move on its own, so animals or the wind (and water in rare cases) move the pollen for plants.

Animal pollinators

Most New Zealand native flowering plants are pollinated by animals – most by insects, but some by birds or even bats. Plants provide nectar and pollen as edible rewards to the animals for visiting a flower. As an animal reaches into a flower for its reward, it brushes against an anther, and some of the pollen sticks to its body. When the animal visits another flower, some of this pollen comes off onto the stigma – pollination has occurred. The pollen of animal-pollinated plants has a rough surface to help it stick to a pollinator.

Attracting insects

Image: Iris landing platform

Many flowers use colours to attract insects, sometimes helped by coloured guiding marks. Some have ultraviolet marks that can be seen by insects but are invisible to human eyes. Flowers are often shaped to provide a landing platform for visiting insects or to forcethem to brush against anthers and stigmas. The pōhutukawa (Metrosideros excelsa) uses colour in a different way. It only has very small petals but big bright red clusters of stamens.

Some flowers have scent to attract insects. Many of these scents are pleasing to humans too, but not all – some flowers attract flies with a smell of rotting meat. Colours can’t be seen in the dark, so scent is important for flowers that are pollinated by night-flying insects such as moths.

Attracting birds

Bird-pollinated flowers tend to be large and colourful so birds can see them easily against a background of leaves. Kōwhai (Sophoraspecies), flax (Phormium tenax, harakeke) and kākā beak (Clianthus puniceus, kōwhai ngutu-kākā) are examples of bird-pollinated native plants. Some flowers even change colour to tell birds when to visit. The flowers of the tree fuchsia (Fuchsia excorticata, kōtukutuku) are greenish when ready for bird visitors, but after they have been pollinated, they turn red to tell birds to stop coming.

Most bird-pollinated flowers have lots of nectar, often at the bottom of a tube of petals. Birds need to brush against anthers and stigmas when reaching for the sugary reward with their long beaks. Some birds, such as tūī, stitchbirds and bellbirds, have special brush-like tips to their tongues to help them soak up the nectar.

Wind pollination

Image: Maize (sweet corn) flowers

Grasses are wind pollinated, as are some of our native trees and shrubs, such as beech (Nothofagus species), kawakawa (Macropiper excelsum, pepper tree) and many Coprosma species. Pollination by the wind is very hit and miss. The wind may pick up pollen from a grass flower and scatter it all over the place. Only by chance will a little pollen land on another flower of the same species. To make up for this waste, wind-pollinated flowers produce a huge amount of pollen, as hay fever sufferers will know.

Wind-pollinated flowers tend to have small dull-coloured petals or, in the case of grasses, no petals at all. They don’t need petals, colour, nectar or scent to attract animals. The pollen grains are not sticky like those of animal-pollinated flowers, which reduces the chance of them sticking to leaves and other obstacles. The stigmas of receiving flowers are sticky in order to hold on to pollen carried by passing breezes.

Pollination

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Pollination

Pollination is very important. It leads to the creation of new seeds that grow into new plants.

But how does pollination work? Well, it all begins in the flower. Flowering plants have several different parts that are important in pollination. Flowers have male parts called stamens that produce a sticky powder called pollen. Flowers also have a female part called the pistil. The top of the pistil is called the stigma, and is often sticky. Seeds are made at the base of the pistil, in the ovule.

To be pollinated, pollen must be moved from a stamen to the stigma. When pollen from a plant's stamen is transferred to that same plant's stigma, it is called self-pollination. When pollen from a plant's stamen is transferred to a different plant's stigma, it is called cross-pollination. Cross-pollination produces stronger plants. The plants must be of the same species. For example, only pollen from a daisy can pollinate another daisy. Pollen from a rose or an apple tree would not work.

But how does pollen from one plant get moved to another?

How Do Plants Get Pollinated?

Pollination occurs in several ways. People can transfer pollen from one flower to another, but most plants are pollinated without any help from people. Usually plants rely on animals or the wind to pollinate them.

When animals such as bees, butterflies, moths, flies, and hummingbirds pollinate plants, it's accidental. They are not trying to pollinate the plant. Usually they are at the plant to get food, the sticky pollen or a sweet nectar made at the base of the petals. When feeding, the animals accidentally rub against the stamens and get pollen stuck all over themselves. When they move to another flower to feed, some of the pollen can rub off onto this new plant's stigma.

Plants that are pollinated by animals often are brightly colored and have a strong smell to attract the animal pollinators.

Another way plants are pollinated is by the wind. The wind picks up 

pollen from one plant and blows it onto another.

Plants that are pollinated by wind often have long stamens and pistils. Since they do not need to attract animal pollinators, they can be dully colored, unscented, and with small or no petals since no insect needs to land on them.