Differences between Self-Pollination & Cross-Pollination

Differences between Self Pollination & Cross Pollination

Hi friends, Let us know the differences between Self-Pollination and Cross-Pollination. Flowers use their beautiful petals and fragrance to attract insects. But, why do they do that? Because the insects help them in pollination.

To Know what is Pollination? check this link below.


Also, What are the different types and how exactly do the insects help. so let’s start with what is pollination in simple words. The act of transferring the pollen grains from the anther The top part of the male organ is called the anther. Transferring pollen grain from anther to the stigma. Stigma is the top part of the female organ.

Based on whether the pollen grains are transferred within the same plants or their transfer between two different plants we can classify them into two kinds. So the first one we’ll call self-pollination and the second one will be called cross-pollination.

Starting with self-pollination, If the pollen grains are transferred within the same plant itself then we’ll say it’s self-pollination. So one way that can happen is if you have four pollen grains transferred in the same flower so from the entrance to the stigma of the same flower this is self-pollination.

But even if you have pollen grains transferred from this from the anther to the stigma of a different flower belonging to the same plant I’ll this is also self-pollination. Because still the pollen grains are being transferred within the same plant.

The pollination is still happening the plant is still pollinating itself that’s the whole idea behind self-pollination so, Here are some examples of self-pollination. for the first one to happen though a flower needs to be bisexual meaning it has to have both the male and the female reproductive parts. Only then it can do this.

Differences between Self-Pollination & Cross-Pollination
Differences between Self Pollination & Cross-Pollination

On the other hand, if the flowers are unisexual then they can still self pollinate this way a male flower can transfer pollen grains to a female flower belonging to the same plant. On the other hand, what do you think is cross-pollination can you guess that now?

Cross-pollination is of pollen grains from one flower to a flower of a different plant or a different tree. For example, if you have pulling rains from here going all the way to the stigma of a different flower all together meaning different flowers belonging to a different tree altogether.

Then that is what we call cross-pollination across two different plants. of course, same species obviously but two different plants altogether. So now you might say, But how exactly does the pollination happen? how do the flowers take the pollen grains and transfer them to the stigma? they don’t have any moving parts?

That’s a great question so the polar pollination depends on certain agents let me just write it down depends on certain agents are things that help in pollination one of the most common agents would be vind so the pollen grains will get just get sprayed into the air.

Then the wind will be the one that carries it forward and because both the pollen grains and the stigma are very sticky and the pollen grain comes very close to that stigma it’ll just stick to it.

But, in some cases, they are not sticky but they are very hairy even then the pollen grains will get entangled very nicely with this stigma and may get stuck to it and pollination happens.

With the help of wind, self-pollination can easily happen. Because they’re very close to each other right the stamen
The pollen grains and the stigma are very close to each other.

So, with wind or water just like how wind helps in transferring pollen grains for land plants water will help in transferring the pollen grains in aquatic plants. But what about cross-pollination?

For cross-pollination to happen the pollen grains need to get transferred from one plant or one tree to another. Now, these trees are very far apart then the chances of cross-pollination reduces. It also attracts using Nectar.

Now, what exactly is nectar you may be asking. Nectar is sugary stuff that the flowers produce near the base of the flower which has a lot of sugar. It has a lot of protein so perfect for hungry bees.

The bees do they get attracted to that particular flower they sit on that particular flower and they start drinking that nectar and as they start drinking that nectar the pollen grains start sticking to the bees. When the bee drinks that nectar it will rest its legs on pollen grain.

When the bee decides to move away it carries that pollen grains with it now the Bee goes on its way on its journey maybe to its home and then it spots another similar flower with the similar fragrance and the similar order and then again it gets attracted to it and starts drinking the nectar from that.

While doing that some of the pollen grains get transferred to the stigma and that’s how cross-pollination can happen but it’s important that the bees need to get attracted to the same species of the flower.

As you can see the pollination has happened. But that’s not the end of the story it’s the beginning of the story. The sperms inside the pollen grains still need to travel into the eggs which are found in the ovaries. Let’s learn the whole process after this in the next one.

If you have any doubts regarding anything, feel free to comment down in the comments section.

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