GRADE IV- SCIENCE & HEALTH

HOW SELF POLLINATION DIFFERS FROM CROSS

POLLINATION

Rosalie Q. Castillo

Lazareto Elementary School

GRADE IV- SCIENCE & HEALTH

HOW SELF POLLINATION DIFFERS FROM CROSS

POLLINATION

Rosalie Q. Castillo

Lazareto Elementary School

Pollination Song

The Pollination Song.mp4

Stinking Plant

•A blow-fly was looking for an ideal place to lay eggs. Like rotting meat. So that when her little maggots were born, they could feed on the meat.

•As she turned a corner in the grassland, she smelt something stinking in the air. The smell of rotten meat! With great joy she perched on it and laid her eggs. She was happy that her children would have enough food to eat.

•The blow-fly did not know she had made a great mistake. What she had sat upon was not meat but a flower, which stinks. It is called a carrion flower. So, when the blow-fly's eggs hatched and the little maggots came out, they had nothing to eat. They died of starvation.

•The carrion flower is one of the many flowers which give out dirty smells to attract flies. The Rafflesia stinks like rotting meat, while the tropical Lords and Ladies flower gives out a smell like rotting fish.

•They do it for a special reason. Unlike mating birds, these plants cannot move from their place. But it is important for the male cell of one plant to get in touch with the female cell of another plant. Once that is done, the seed of the plant will bloom and give birth to another plant.

•The plant uses its stink to attract flies. As soon as the blow-fly sits on the flower, it is captured by the flower with strong hair. When the hair falls, the fly is free to fly - but it takes some pollen with it. And goes and sits on another plant. The male cell of one plant meets the female cell of the other. The seed gets new life.

Guessing Game…

• Here I am. I am slow, I am fast. You can feel me but you can’t see me.

Guessing Game…

• Here I am. I am slow, I am fast. You can feel me but you can’t see me…

wind wind

• When I come, plants welcome me with open arms and when I do not come, farmers pray

that I may come soon.

When I come, plants welcome me with open

arms and when I do not come, farmers pray that

I may come soon…

rain

rain

• I come zooming like an airplane into red, yellow, pink flowers in the garden…

• I come zooming like an airplane into red, yellow, pink flowers in the garden…

bees

bees

• I am always a welcome in the garden by visitor, because of

my colorful velvet dress…

• I am always a welcome in the garden by visitor, because of

my colorful velvet dress…

butterfly

butterfly

• I touch, I smell, I pick these beautiful flowers , who am I?• I touch, I smell, I pick these beautiful flowers ,

who am I?

man man

ACTIVITY 1

1. Observe the flowers in the garden.

2. What insects are found in the garden?

3. Explain why insects are attracted to some flowers?

ACTIVITY

1. Observe the flowers in the garden.

2. What insects are found in the garden?

3. Explain why insects are attracted to some flowers?

Let’s Observe and Draw

Do the following:1. Observe a flower from afar wait until an

insect stay on it. Then draw what you see.

2. Observe the insect. Does the insect transfer from one flower to another flower? Draw what you see.

Let’s Observe and Draw

Do the following:1. Observe a flower from afar wait until an

insect stay on it. Then draw what you see.

2. Observe the insect. Does the insect transfer from one flower to another flower? Draw what you see.

ACTIVITY

Study the illustration of the 2 kinds of pollination.

A B

ACTIVITY

Study the illustration of the 2 kinds of pollination.

A B

Answer the questions.

1. Which illustration involves flower from the same plant?

2. Which involves flowers from 2 plants?

3. Which illustration can be called self- pollination? Why?

4. Which illustration can be called cross-pollination? Why?

Answer the questions.

1. Which illustration involves flower from the same plant?

2. Which involves flowers from 2 plants?

3. Which illustration can be called self- pollination? Why?

4. Which illustration can be called cross-pollination? Why?

Video Viewing

Cross pollination and Self Pollination

Video Viewing

Cross pollination and Self Pollination

Flowers_ Cross Pollination and Self Pollination.mp4

Self pollination : is the transfer of pollen grains from the anther to

the stigma.

Self pollination : is the transfer of pollen grains from the anther to the stigma of the same flower or another flower of the same plant.

Cross pollination: is the transfer of pollen grains from the anther of one flower to the stigma of another of the same kind.

Cross pollination: is the transfer of pollen grains from the anther of one flower to the stigma of another flower of the same kind.

Answer the questions:

• What are the two kinds of pollination?

• Differentiate one from the other.

Answer the questions:

• What are the two kinds of pollination?

• Differentiate one from the other.

Unscramble the letters of the correct answer.

SRCOS PLINOLONATI transfer of pollen grains from the anther to the stigma of the same flower.

FSEL IONLINAPOLT transfer of pollen grains from the anther to the stigma of another of the same kind.

Unscramble the letters of the correct answer.

FSEL IONLINAPOLTtransfer of pollen grains from the anther to the stigma of the same flower.

SRCOS PLINOLONATItransfer of pollen grains from the anther to the stigma of another of the same kind.

• How does self- pollination differ from cross pollination?• How does self- pollination

differ from cross pollination?

DIRECTION: Study the pictures which is a self pollination and cross pollination.

• Make a list of flowering plants. Opposite each, write how they are pollinated.

• Make a list of flowering plants. Opposite each, write how they are pollinated.

Thank you…Thank you…