PL AR RS P5L20 Reproduction in Plants WS

Primary 5

Rocket Science

Name __________________________________________________
Tutor
Topic __________________________________________________

REPRODUCTION IN PLANTS (LESSON 20)
REPRODUCTION IN PLANTS (LESSON 20)

Primary 5: Rocket Science

Lesson Outline

• Notes
• Activity 1: Hands-on Activity
• Activity 2: MCQs
• Activity 3: Open-ended Questions
• Activity 4: Fun Facts

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Primary 5: Rocket Science

Reproduction in plants – NOTES

Reproduction is the ______________________________________________________
_______________________________________________________________________.
This is important because plants and animals reproduce to ________________________
_______________________________________________________________________.

• Different plants reproduce in different ways.

Lesson

Reproduction in Plants

Flowering Plants Non-flowering Plants
from from

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Primary 5: Rocket Science

Reproduction in plants – NOTES

Life cycle of Plants (Reproduction from seeds)

Fruit Seeds

___________________

___________________

___________________ Roots and leaves
develop

_____________
develop

What is Pollination?

Pollination occurs when _____________ _____________ are ________________ from

the _______________ of one flower to the ________________ of the same flower or

another flower of the same kind.
What is Fertilisation?

Fertilisation is the process in which __________________________________________

_______________________________________________________________________.

Parts of a Flower

Flowers are important in making seeds.

A typical flower has both male and female parts on a single flower.
Examples: Tomato, hibiscus and morning glory.

Some types of plants have male and female parts on separate flowers.
Examples: Watermelon, maize, papaya and cucumber.

In a few types of plants, the male and female flowers appear on separate plants.
Example: Asparagus.

The male part is called the __________________, while the female part is called

the ____________________. 4

Reproduction in plants – NOTES Primary 5: Rocket Science
Label the different parts of the flower. Pistil

Stamen

Activity 1 – Hands-on Activity: Flower dissection video
Objective: To identify the different parts of a flower and its respective functions.

AR Model – Flower

https://www.youtube.com/watch?v=frdzKHDL-80&feature=emb_logo

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Primary 5: Rocket Science

Reproduction in plants – NOTES

Parts of a Flower
From the dissection of the flower to its respective parts in the video, draw the parts in the
spaces provided below.

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Anther

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Filament

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Sepal

Receptacle Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

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Primary 5: Rocket Science

Reproduction in plants – NOTES

Stigma Function: ____________________________________
Style _____________________________________________
Ovary _____________________________________________
Ovule _____________________________________________
Petal
Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

Function: ____________________________________
_____________________________________________
_____________________________________________
_____________________________________________

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Primary 5: Rocket Science

Reproduction in plants – NOTES

Process of fertilization:
During pollination, the pollen grains are transferred to the stigma.

Each pollen grain will produce a pollen tube. The male cells are found inside the tip of the tube.
The pollen tube enters the ovule which contains an egg cell.
Fertilization occurs when the female egg cell and the male cell fuse.
After fertilization, the petals, style and stigma usually wither and drop off.
The ovary gradually develops into a fruit. The ovules inside the ovary develop into seeds.

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Primary 5: Rocket Science

Activity 2 – MCQs

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Primary 5: Rocket Science
1. The diagram below shows a cross-section of a flower.

Which one of the following correctly represents W, X, Y and Z in the chart above?

W X Y Z
(1) A B fertilisation D
(2) A C pollination B
(3) B A fertilisation D
(4) B A pollination C

( )

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Primary 5: Rocket Science

2. Study the flowchart below.

Ovary become
Part A

Pollen grains Stigma Process Y
from anther Process X

Ovule become
Part B

Which one of the following correctly identifies Parts A and B and Processes X and
Y?

Parts Process

AB XY

(1) Fruit Seed Pollination Fertilisation

(2) Fruit Seed Fertilisation Pollination

(3) Seed Fruit Pollination Fertilisation

(4) Seed Fruit Fertilisation Pollination

()

3. Diagram 1 shows Process X taking place in a human. Diagram 2 shows the
cross-section of a flower.

Diagram 1 Diagram 2

In which part of the flower, P, Q, R or S, does Process X take place? ()
(1) P
(2) Q 11
(3) R
(4) S

Primary 5: Rocket Science

4. Johnny observed the changes in flower M over a few weeks.
flower M

fruit

He wrote the following statements.
A Fertilisation has taken place in flower M.
B The ovule of flower M has developed into a fruit.
C The ovary of flower M has developed into a seed.

Which of the above statements is/are correct?

(1) A only
(2) A and B only
(3) B and C only
(4) A, B and C

()

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Primary 5: Rocket Science

5. The diagrams show a flower, with colourful petals, and fruit belonging to the same plant.
XY

W Z
U

flower fruit
()
Which of the following statements are correct?
A W helps pollinate Z
B U develops to become Y
C X develops to become Z
D Y and Z are formed from a flower

(1) A and B only
(2) C and D only
(3) B and D only
(4) A, B and D only

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Primary 5: Rocket Science

6. Both male and female parts can be found on the flowers of a lemon tree. Dora carried
out an investigation on four similar lemon flowers, A, B, C and D, to find out whether a
fruit can be produced when certain parts of the flowers are removed.

A Lemon flowers D
removed BC removed

Male parts removed removed
Female parts
Petals removed

The table above shows the parts of the flowers which have been removed. Which flower(s)
is/are still able to become a fruit?

(1) C only ()
(2) A and C only
(3) B and D only
(4) A, C and D only

7. Flower X attracts animals that are active at night to pollinate its flowers. Which of the
following characteristic(s) does Flower X have to attract these animals for pollination at
night?

A Has small, dull coloured petals
B Gives out a strong and sweet smelling scent
C Has anthers hanging outside the flowers

(1) A only
(2) B only
(3) B and C only
(4) A, B and C

()

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Primary 5: Rocket Science

8. Samuel observed that a tomato flower has both the male and female parts. He wanted to
find out if fruits will develop when certain parts of the tomato flowers were removed.

The table shows the parts of the flower removed from the three tomato flowers, A, B and
C. A tick in the box represents that the part is removed.

Parts removed Flower A Flower B Flower C
Petals   
Anther
Stigma

Which of the tomato flower(s) can develop into fruits? ()
(1) A only
(2) C only
(3) A and B only
(4) B and C only

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Primary 5: Rocket Science

9. The diagram below shows the life cycle of a flowering plant. J, K, L, M and N are the
different stages of development of the plant.

J K L
(Seed) (Seedling) (Young plant)

N M
(Adult plant (Flowering

with fruit) adult plant)

Which of the following statement(s) about the different stages of the plant is/are true?

A: Water is not needed at J.
B: Light is required by the plant for making food at K, L, M and N.
C: Pollination and fertilisation can take place at M.

(1) B only

(2) C only
(3) A and B only
(4) B and C only

()

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Primary 5: Rocket Science

10. The diagram below shows Fruit S and cut slices of Fruit S.
X
Y

Which parts of the flower do X and Y develop from?

X Y
(1 ) stigma pollen grain
(2 ) ovule
(3 ) ovary ovary
(4 ) anther ovule
stigma

()

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Primary 5: Rocket Science

Activity 3 – Open-ended Questions
1. Bala found two identical flowers, X and Y, in the school garden. He identified four parts,
A, B, C and D, of each flower.
A
B
C
D

He removed some parts from each flower, dusted some pollen grains onto the two
flowers and observed the flowers over a period of time.

He recorded his observation in the table below.

flower Did the flower develop into a fruit?
X yes
Y no

(a) Bala removed one part from flower Y. Which part, A, B, C or D, did Bala remove from

flower Y? Explain your answer. [1]

____________________________________________________________________

____________________________________________________________________

(b) Explain how the number of fruits will be affected if part C is removed from all the flowers.
[2]

____________________________________________________________________

____________________________________________________________________

______________________________________________________________________________________

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Primary 5: Rocket Science

2. The diagram below shows some of the stages of sexual reproduction in plants.

Process X Process Y

A
fruit

flowers

(a) Describe clearly what happens during process X. [1]

___________________________________________________________________________

___________________________________________________________________________

(b) State the part of the flower that A developed from. [1]

_____________________________________________________________________________

(c) The seeds of the fruit need to be scattered far away so as to prevent overcrowding. Explain [1]
how that helps the young plants to grow healthily.

___________________________________________________________________________

___________________________________________________________________________

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Primary 5: Rocket Science
Activity 4 – Fun Facts: Pollination and fertilization in plants (watch from 8:48min onwards)

https://www.youtube.com/watch?v=0UEpq1W9C_E&feature=emb_title
Discussion questions:
1. What are the 2 methods of pollination?
2. What tube is the male reproductive cell transported in?
3. Where does the fusion of male reproductive cell and the female
reproductive cell take place?

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