The document discusses the differences between self-pollination and cross-pollination using engaging examples, such as the carrion flower and its attraction to blow-flies. It explains the mechanisms of both types of pollination, highlighting their importance in plant reproduction. The document also includes interactive activities and questions to enhance understanding of these concepts.

1. GRADE IV- SCIENCE & HEALTH
HOW SELF POLLINATION
DIFFERS FROM CROSS
POLLINATION
Rosalie Q. Castillo
Lazareto Elementary School

2. Pollination Song

3. 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.

4. • 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.

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

6. wwinindd

7. • When I come, plants welcome
me with open arms and when
I do not come, farmers pray
When I come, plants
welcome me with open
arms and when I do not
come, farmers pray that
that I may come soon.
I may come soon…

8. rraaiinn

9. • 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…

10. bbeeeess

11. • I am always a welcome in the
• I am always a welcome in the
garden by visitor, because of
my colorful velvet dress…
garden by visitor, because of
my colorful velvet dress…

12. bbuutttteerrffllyy

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

14. mmaann

15. ACTIVITY 1
ACTIVITY
1. Observe the flowers in the garden.
1. Observe the flowers in the garden.
2. What insects are found in the garden?
2. What insects are found in the garden?
3. Explain why insects are attracted to
some flowers?
3. Explain why insects are attracted to
some flowers?

16. Let’s Observe and Draw
Let’s Observe and Draw
Do the following:
1. Observe a flower from afar wait until an
Do the following:
1. Observe a flower from afar wait until an
insect stay on it. Then draw what you
see.
insect stay on it. Then draw what you
see.
2. Observe the insect. Does the insect
2. Observe the insect. Does the insect
transfer from one flower to another
flower? Draw what you see.
transfer from one flower to another
flower? Draw what you see.

17. ACTIVITY
ACTIVITY
Study the illustration of the 2 kinds of
Study the illustration of the 2 kinds of
pollination.
pollination.
A B
A B

18. Answer the questions.
Answer the questions.
1. Which illustration involves flower from
1. Which illustration involves flower from
the same plant?
the same plant?
2. Which involves flowers from 2 plants?
3. Which illustration can be called self-pollination?
2. Which involves flowers from 2 plants?
3. Which illustration can be called self-pollination?
Why?
Why?
4. Which illustration can be called cross-pollination?
4. Which illustration can be called cross-pollination?
Why?
Why?

19. Video Viewing
Video Viewing
Cross pollination and Self Pollination
Cross pollination and Self Pollination

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

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

22. Answer the questions:
Answer the questions:
• What are the two kinds of
pollination?
• What are the two kinds of
pollination?
• Differentiate one from the
other.
• Differentiate one from the
other.

23. Unscramble the letters of the
Unscramble the letters of the
correct answer.
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 the same flower.
FSEL IONLINAPOLT transfer of pollen
grains from the anther to the stigma of
another of the same kind.
SRCOS PLINOLONATI
transfer of pollen grains from the anther
to the stigma of another of the same
kind.

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

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

26. • 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.

27. TThhaannkk yyoouu……