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Pollination and Fertilization


 

We all have seen trees full of fruits. Oranges, apples, peaches, nectarines, grapes are all plants that bear fruits. But, have you ever thought of how these plants produce fruits. In this lesson we are going to learn about how pollination and fertilization take place in flowers in order to produce fruits. At the end of the lesson you can go to Pollination and Fertilization Quiz and check your knowledge on the lesson.

 

pollination apple trees

Apple Trees

 

orange-trees

An Orange Tree

 

pollination grapevine

A Grapevine

 

chilly-plants

A Chilly Plant

 

manderines

A Mandarin Tree

 

Pollination

 

What is ‘pollination’?

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

 

pollination and fertilization

How pollination takes place between pollen grains and stigma of two different flowers of same species

 

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.

 

pollination and fertilization - pollination by wind

Plants with flowers that get pollinated by wind

 

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 nectar from flowers?

 

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

 

fertilization and pollination

A bee gathering nectar from a 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. This makes the female sex cells or eggs fertilize. This joining or the combination of male sex cells and female sex cells in a flower is what we call fertilization. Fertilization cannot take place without pollination.

 

pollination and fertilization - how fertilization takes place in flowers

How fertilization takes place in flowers

 

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.

 

pollination of a butternut pumpkin flower

Changes after the fertilization of a butternut pumpkin flower

 

pollination of a butter nut pumpkin flower

The butternut pumpkin flower’s ovary has turned into a complete fruit and its petals, stamen and stigma have fallen off

 

Try Pollination and Fertilization Quiz