PS AR RS P5L24 Revision 2 WS

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Topic: REVISION 2 (LESSON 24)

Rocket Science | Primary 5

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Primary 5: Rocket Science

Lesson Outline

• Notes
• Activity 1: MCQs
• Activity 2: Open-ended Questions

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Primary 5: Rocket Science

– NOTES

Reproduction in plants

During , the pollen grains are transferred to the stigma.

Each pollen grain will produce a pollen . The male cells are found inside the tip of the tube.

The pollen tube enters the ovule which contains an egg cell.

After , the petals, style and stigma usually wither and drop off.

The ovary gradually develops into a . The ovules inside the ovary develop into seeds.

Dispersed by Dispersed by Dispersed by Dispersed by
or
Characteristics Dry, light, small, Juicy, fragrant, Have waterproof
of fruits and have wing-like sweet or outer layer or Explosive
seeds or parachute-like action
brightly-coloured fibrous husks to
Examples structure fruit, hard seeds, help stay afloat Have fruit walls
that split open
Shorea have hooks or in water with a sudden
Lalang stiff hair force when ripe
Angsana Coconut
Tridax Papaya Lotus Balsam
Mango Bean
Mimosa Pong pong Rubber
Love grass Mangrove Saga

Reproduction in humans

• In males, the testes develop and produce .

• In females, the ovaries develop and produce or ova (sing.: ovum). An egg is

usually released from one of the ovaries each month.

• During mating, sperms from the male testes are first released into the female’s vagina
through the penis.

• The sperms travel towards the egg. Fertilisation takes place in the .

• Only sperm will fuse with the egg. The remaining sperms eventually die.

• After the sperm fuses with the egg, the egg is said to be .

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Primary 5: Rocket Science

– NOTES

Concept map

Use the given words to complete the following concept map.

photosynthesis growth cell membrane nucleus cytoplasm chlorophyll chloroplasts

cell wall trap sunlight repair shape activitiesprotects replace

Cells For cell division,
1.
must be present

Animal cell drawing Plant cell drawing

Importance of cell division

2. To
damaged cells.

Similarities 3. To of
dead cells.

4. For
an organism.

5. : Controls all
in the cell.

6. : Partially permeable. Allows some
substances to pass through it, while preventing others.

7. : A jellylike liquid that fills the cell.

Differences Plant cell
Animal cell

8. No 10. Surrounded by that
9. No
the cell and gives

the cells a .

11. Chloroplasts: Contain
to for
.

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Primary 5: Rocket Science

Activity 2 – MCQs

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Primary 5: Rocket Science

1. Four pupils were arguing over what an adult plant needs to do in order to increase its
chances of having more healthy seedlings.

Abel: Disperse its seeds as far as possible.
Ben: Reproduce as many seeds as possible.

Calvin: Provide more nutrients for the seed leaves. ( )
Daniel: Make more food for the seeds so that they can be healthier.
Which one of the statements made by the pupils is correct?
(1) Abel
(2) Ben
(3) Calvin
(4) Daniel

2. The diagram below shows the human and plant reproductive systems.

Which of the following statements is correct?

Parts which produce the Similarity between both humans
and plants
reproductive cells

Human Plant

(1) P X The fertilised egg is found in the
ovary.

(2) P Y Fertilisation occurs in the female
reproductive part.

(3) Q W Fertilisation occurs in the female
reproductive part.
( )
The fertilised egg is found in the
(4) Q Y ovary. 5

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Primary 5: Rocket Science

3. Which part of the flower has a similar function as Part X? Part X
BA

C
D

Plant Reproductive System Human Reproductive System

(1) A

(2) B

(3) C
(4) D

4. Which of the following traits can be passed down from parents to young? ( )
A: Ability to speak a third language ( )
B: Detached earlobe
C: Thumbprint
D: Ability to roll tongue

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

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Primary 5: Rocket Science

5. The diagram below shows the cross section of three flowers. The black dots represent
pollen grains.

Flower A Flower B Flower C

Which of the following flowers have been pollinated? (
B
(1) A and B only
(2) A and C only
(3) B and C only
(4) A, B and C only

)

6. Two cells A and B are shown.
A

Q

Q
Which of the following gives the correct classification of the cells and the function of part
Q?

Animal Plant Function of part Q
cell cell To control substances in and out of the cell

(1) - A, B

(2) A B Controls the activities in the cells

(3) B A Jelly-like substance where cell activities take place

(4) B A Controls the activities in the cells
()

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Primary 5: Rocket Science

7. There was an accident on a ship and harmful chemicals spilt into the sea. Fishermen
nearby found that their nets were damaged by the harmful chemicals. The damage to
their nets is shown in the diagram below.

Shortly after, fishes around the ship died. What could be a possible reason?

(1) Cell walls in the gills were not able to allow enough gaseous exchange.

(2) Cell walls in the gills were not able to allow enough water to pass through.

(3) Cell membranes in the gills were not able to allow enough gaseous exchange.

(4) Cell membranes in the gills were not able to allow enough water to pass through.

()

8. The diagram below shows a cross-section of an orange.

Part A

Part B

Which part of the flower did Part A and Part B develop from?

Part A Part B ()
(1) stigma style
(2) stigma ovule
(3) ovary ovule
(4) ovule ovary

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Primary 5: Rocket Science

9. The diagram below show three different cells.

AB C
Which of the following correctly identifies the origin of the cells? (

A B C )
(1) Leaf Flower Stem
(2) Leaf Flower Cat
(3) Flower Leaf
(4) Flower Cat Cat
Leaf

10. The diagram below shows how sand is separated from water using a filter paper.
The filter paper only allows some substances to pass through it.

Which part of a cell has the same function as the filter paper? ( )

(1) nucleus 910
(2) cell wall
(3) cytoplasm
(4) cell membrane

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Primary 5: Rocket Science

Activity 3 – Open-ended Questions
1. The diagram below shows a single-celled organism which lives in a pond.

nucleus cell membrane

cytoplasm cell wall
chloroplast

(a) Which part of the cell has a similar function as the skeletal system? Explain your [1]
answer.

(b) Based on the diagram, explain how this organism obtains food. [1]
(c) State the function of the cell membrane. [1]

10

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Primary 5: Rocket Science

2. The diagram below shows fruit A.

wing-like structure [1]
[1]
(a) What is the method of dispersal for fruit A?
(b) How does having a wing-like structure help with seed dispersal?

John took a similar fruit and cut off part of its structure as shown below.

He dropped both fruits from the same height and recorded the time taken for each fruit
to land.

(c) What was the aim of his experiment? [1]

11

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Primary 5: Rocket Science
A shuttlecock shown below has a similar structure as fruit A.

(d) Explain why the shuttlecock is made in this manner. [1]

12

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