Pollination

Introduction

When I was a kid, I have always been curious how plants reproduce. On our 2nd grade, we were taught that you grow plants by planting seeds. I still remember back in my 2nd grade science class how we planted mongo seeds in a can and how fast its development is. But I still had a question back in my head, how about the trees in the forest? or the grass that just keep on growing on our garden? How did they reproduce? Now that I am a grown up and have the ability to do research on the internet I'm going to grab this chance to talk about pollination, the process by which pollen is transferred in the reproduction of plants or simply the answer to my question. 

What does the word "pollination" mean?

Pollination is the transfer of pollen from a stamen to a pistil. Pollination starts the production of seeds

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.

What about plants that don't have flowers?

Some plants don't have flowers. Plants such as mosses and ferns reproduce by spores. Cone-bearing plants, like pine or spruce trees for example, reproduce by means of pollen that is produced by a male cone and travels by wind to a female cone of the same species. The seeds then develop in the female cone.

What are the benefits?  

Plants benefit from pollinators because the movement of pollen allows them to reproduce by setting seeds.  However, pollinators don't know or care that the plant benefits.  They pollinate to get nectar and/or pollen from flowers to meet their energy requirements and to produce offspring.  In the economy of nature, the pollinators provide an important service to flowering plants, while the plants pay with food for the pollinators and their offspring.

Sources:

http://www.mbgnet.net/bioplants/pollination.htmlhttp://www.pollinatorparadise.com/what_is_pollination.htmhttp://en.wikipedia.org/wiki/Pollination