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A Comprehensive Guide to Homeschooling

Pollination and Fertilization


 

In this lesson we are going to learn about how do pollination and fertilization take place in flowers.

 

Pollination

 

What is ‘pollination’?

The transfer (move) of pollen grains from the anther (of the stamen) to the stigma (of the pistil) is called pollination.

pollination

 

Where can pollination happen?

 

1) Between pollen grains and stigma of the same flower.

2) Between pollen grains and stigma of different flowers of same species.

 

Who are the agents of pollination?

 

  • Wind
  • Water
  • Animals

 

Wind

Pollen grains are very light in weight, so they can easily float in the air and move to other plants.

 

Why don’t all flowers have brightly coloured petals?

 

1. All flowers don’t have brightly coloured petals.

2. Some grasses have small, dull, off-white flowers.

3. This is because they are not pollinated by insects or other animals.

4. They use the wind to blow their pollen grains to other plants.

 

Water

When it is raining, pollen grains can be washed away and brought to the stigma.

 

Animals

Animals like insects, birds and squirrels can transfer pollen grain to other flowers.

 

Have you seen honey bees gathering honey from flowers?

 

When insects like bees go one flower to other flower, pollen grains in one flower can be stuck in their body parts and brought to the stigma of another flower.

 

 

Fertilization

 

What is ‘fertilization’?

After a flower is pollinated, each pollen grain which is on the stigma grows a tiny tube towards the ovules in the ovary. Then the male sex cells in pollen grains can reach the ovules and join female sex cells or eggs produced in ovules. Then the female sex cells or eggs can be fertilized. This joining or the combination of male sex cells and female sex cells in a flower is called fertilization. Fertilization cannot take place without pollination.

 

What happens after fertilization?

After fertilization the petals, the stamen and the stigma fall off. The ovules become the seeds. The carpels and the ovary become the fruit.