Difference Between Self Pollination and Cross Pollination

In plants, pollination plays an important role in reproduction.

Pollination is the sexual method of reproducing in all plants by the process of transferring the pollen grains from the anther to the stigma of the gynoecium and thereby permitting the fertilization process. In this process, the spermatophytes or the seed plants pass their genetic information to its next generation, just like all other living organisms.

The process of pollination was first identified by Christian Konrad Sprengel in the 18th century. This is commonly known as an interaction between pollen vector and a flower. The significance is found in agriculture and horticulture.

There are two types of pollination -:

  • Self-pollination


  • Cross-pollination

Cross Pollination and Self Pollination


The cross-pollination is defined as deposition of pollen grains from a flower to the stigma of another flower. Commonly, the process is done pollinators that are insects and wind. By insects, the process takes place in several plants like tulips, grapes, plums, apples, pears, strawberries, daffodils, raspberries and others. While, by wind for different grasses, maples trees, dandelions, catkins, and others.

Self Pollination

In this process, the pollen grains transfer from the stigma of the same or genetically similar flower. The self-pollination can be seen in legumes like sunflowers, orchids, peanuts, oats, peas, potatoes, wheat, peaches, and more.

Let us learn more in detail about the differences between the two types of pollination.

Difference Between Self-Pollination and Cross-Pollination


Self-Pollination Cross-Pollination
Transfer pollen grains from the anther to the stigma of the same flower. Transfer pollen grains from the anther to the stigma of the different flower.
This process can take place either in the same flower or another flower of the same plant. This process can take place between two flowers on different plants.
It occurs in the flowers which are genetically same. It occurs between flowers which are genetically different.
Occurs only in perfect flowers. Occurs both in perfect or imperfect flowers.
Causes homogenous conditions in progenies. Causes heterozygous condition in progenies.
Self-pollination increases genetic uniformity and decreases genetic variation. Cross-pollination decreases genetic uniformity and increases genetic variation.
Causes inbreeding. Causes outbreeding.
Reduces the gene pool. Maintains the gene pool.
Produces limited amounts of pollen grains. Produces large amounts of pollen grains.
In self-pollination, both the stigma and anther mature at the same time. In cross-pollination, both the stigma and anther mature at the different time.
Transfers few numbers of pollen. Transfers large numbers of pollen.
This process is carried out even when the flowers are closed. For cross-pollination to happens flower should be open.
No need of pollinators to transfer pollen grains. Require pollinators to transfer pollen grains.
Pollen grains are directly transferred onto the stigma of the flower. Pollen grains are transferred through insects, wind, water, animals, etc.

Stay tuned with the BYJU’S to learn more about the pollinations, types and its differences.

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The finches of Galapagos islands provide an evidence in favor of