PS AR RS P5L35 Cell System 5 WS

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Topic: CELL SYSTEM 5 (LESSON 35)

Rocket Science | Primary 5

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Primary 5: Rocket Science

Lesson Outline

• Notes
• Activity 1: Fun facts
• Activity 2: MCQS
• Activity 3: Open-ended Questions
• Activity 4: Science in daily life

1

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Primary 5: Rocket Science

Notes – Cell system

Heredity

In order to show the relationships within and beyond the immediate family, a family tree can
be used.

Grandfather Joe Grandmother Sue

AR Model – DNA

Uncle Aunt Aunt Daddy Mommy
Mike Karen Jasmine Steven Joyce

Cousin Cousin Brother Me Brother
Janice Jane Matthew
John (Kristie)

When living things reproduce, the young will inherit some characteristics or traits of their
parents. These traits are passed on through structures called genes found in the nuclei of cells.

The traits that are passed on from the parents to the young vary. Some are more obvious than
others, some are unique and some can be affected by the environmental factors.

Traits

Obvious Less obvious Unique Can be affected Not inherited
by environmental

factors

- Colour of - Quality of Finger - Height of a - Length of
eyes, hair & fruits of -prints person can be hair
skin flowering affected by the
plants diet - Length of
- Height fingernails
- Dimples - Blood group - Quality of fruits
- Ability to - Quality of can be affected
by the quality of
roll the milk of the soil
tongue animals
- Skin colour
darkens due to
sun-tanning

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Primary 5: Rocket Science

Activity 1 – Fun facts: Twins

https://www.youtube.com/watch?v=x7QHAasiDgE

Discussion Questions:
1. What is the name of the process where an egg cell fuses with a sperm cell?
2. What is a zygote?
3. How many egg/s are fertilised in the formation of identical twins?
4. How many egg/s are fertilised in the formation of fraternal twins (non-identical

twins)?
5. Would a set of boy-girl twins be fraternal twins or identical twins?

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Primary 5: Rocket Science

Activity 2 – MCQs

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Primary 5: Rocket Science
1. The diagrams below show three different cells.

Which one of the following statements is true about all the three cells? ( )
(1) They are animal cells.
(2) They can photosynthesise.
(3) They have cytoplasm and cell membranes.
(4) They have cell walls that help them to maintain their shape.

2. The diagrams below show two plant cells A and B.

Which one of the following best identifies plant cells A and B?

Plant Cell A Plant Cell B

(1) Root cell Leaf cell

(2) Leaf cell Root cell

(3) Leaf cell Leaf cell

(4) Root cell Root cell

()

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Primary 5: Rocket Science
3. Diagram P shows a plant cell from one part of the potato plant as shown below.

A
B

C

D

Diagram P
In which part of the plant, A, B, C or D is the cell in diagram P taken from?

(1) A
(2) B
(3) C

(4) D

( )

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Primary 5: Rocket Science

4. Study the diagrams below.

Which of the following statements are true about the cells shown above?

A. Cell X has a regular shape.
B. Cell Y cannot make its own food.
C. Both cells X and Y are animal cells.
D. Cell Y is unable to control substances moving in and out of it.

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

()

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Primary 5: Rocket Science

5. Mr Tan prepared two sets of slides for his class. The students were asked to draw
what they saw under the microscope as shown below.

Specimen Y Specimen X

Based on the diagrams above, what conclusions can be made by the students
on Specimens X and Y?

A The nucleus is located in the centre of the cells in X and Y.
B Specimen X are plant cells while Specimen Y are animal cells.
C The cell membrane surrounds the cytoplasm of the cells in X and Y.
D Cells in Specimen X have cell wall while cells in Specimen Y do not have.

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

()

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Primary 5: Rocket Science

6. The diagram shows two groups of cells, A and B, under a microscope. Four students
made a statement each about the two groups of cells.

Alex AB
Bala
Carol Cells in Group A can be found in all living things.
Danish Cells in Group A do not have rigid and regular shape.
Cells in Group B contain chloroplasts within the cytoplasm.
The outermost layer of the cells in Group B is the cell membrane.

Which pair of pupils have made the correct statement?
(1) Alex and Carol
(2) Alex and Danish
(3) Bala and Carol
(4) Bala and Danish

()

7. Substance P must pass through various parts of an onion cell before reaching the
nucleus. Which of the following shows the correct order of movement of substance P?

(1) cell membrane cytoplasm cell wall

(2) cell membrane cell wall cytoplasm

(3) cell wall cytoplasm cell membrane

(4) cell wall cell membrane cytoplasm

()

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Primary 5: Rocket Science

8. The diagram below shows a single-celled organism found in ponds.

Cell wall cytoplasm
Cell membrane chloroplast
nucleus

Which one of the following gives the correct classification of the cell and the reason?

Type of Cell Reason
(1) Animal Has cell wall
(2) Animal Has nucleus
(3) Plant Has cell membrane
(4) Plant Has chloroplast

()

9. The diagram below shows a plant cell.

What is the function of R?

(1) To trap light to make food.
(2) To give the cell its shape.
(3) To control everything happening inside the cell.
(4) To control the substances going in and out of the cell.

()

10

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Primary 5: Rocket Science

10. The table below shows some information about three different cells, 1, 2 and 3.

Parts of a cell Cell 1 Cell 2 Cell 3
Nucleus Yes Yes Yes
Cell wall Yes No Yes
Yes Yes Yes
Cytoplasm No No Yes
Chloroplast Yes Yes Yes
Cell membrane

Based on the information in the above table, a student made the following statements:

A: Cell 2 is an animal cell.
B: Cell 3 is able to make its own food.
C: Cell 1 is a plant cell that does not make food.

Which of the above statement(s) is/are definitely true about the cells?

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

( )

11

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Primary 5: Rocket Science

11. Which of the following statements about cells are correct?

A. : A cell is a basic unit of life.
B. : As a living thing grows, the size of its cells grows.
C. : All living things are made up of more than one cell.
D. : Cell membrane is present in both the animal and the plant cell.

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

( )

12. The diagram below shows 4 different types of cells taken from either plants or
animals.

Which of the above are animal cells?

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

()

12

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Primary 5: Rocket Science

Activity 3 – Open-ended Questions
1. Study the flowchart below.

(a) Is A an animal cell? Explain your answer. [1]
[1]
B and C are found in a plant. [1]
(b) Which part of the plant is B most likely found in? [1]

(c) Which part of the plant is C most likely found in?

(d) Based on the flowchart only, list all the characteristics of C.

13

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Primary 5: Rocket Science

2. John observed 4 different types of cells under the microscope.

A B

cytoplasm cell
membrane
nucleus nucleus cytoplasm

cell cell wall chloroplast
membrane

C cytoplasm D
cytoplasm cell membrane

nucleus cell wall nucleus

chloroplast

cell membrane

(a) Which of the above cells, A, B, C or D is/are able to make its/their own food? Give a

reason for your answer. . [2]

(b) Which cell(s), A, B, C or D, may burst if water continues to enter it? Give a reason for

your answer. . [1]

14

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Primary 5: Rocket Science

3. Alisha prepared two cell specimens X and Y, from a flowering plant. The diagram below
shows the parts of the plant where the specimens were obtained.

part from which cell
specimen X was obtained

part from which cell
specimen Y was obtained

The diagram below shows three different types of cells P, Q and R.

cCelel Pll P ceClleQll Q cCelel Rll R

(a) Alisha claimed that cell P was obtained from specimen Y. Do you agree with her?

Give a reason for your answer. [1]

(b) Which cell, P, Q or R would Alisha be observing under the microscope when she

looked at the specimen X? Explain your answer [1]

Alisha then soaked each cell, P, Q and R in a beaker of water for 5 hours. At the end of
the 5 hours, she observed that only one of the cells became swollen and burst while the
rest did not burst.

(c) Which cell would swell and burst after being soaked for 5 hours? Give a reason for

your answer. [1]

15

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Primary 5: Rocket Science

4. Look at the picture of Cell Z below. [1]

A
Cell Z
(a) Is cell Z a plant cell or an animal cell? Explain why.

(b) Identify Part A. [1]

Two cells, P and Q, were placed in a solution with dissolved chemicals, X and Y. After
a few minutes, the cells were removed and examined under a microscope.

Before being placed in solution After being placed in solution

Cell P

Cell Q

(c) Using the information given, indicate whether the statements below are “True”, “False”
or “Not possible to tell” by putting a tick ( √ ) in the appropriate boxes.

Statements True Not

(i) Cell P enabled only chemical X to enter the cell. False possible to
(ii) Both cells P and Q enabled chemical Y to move tell

in and out of them.
(iii) Chemical Y can enter cell P more quickly than

cell Q.
(iv) At the end of the experiment, both cells P and Q

will stay in their original cell shape.

16

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Primary 5: Rocket Science

Activity 4 – Science in daily life: How do wounds heal?

https://www.youtube.com/watch?v=TLVwELDMDWs 118 7

Discussion Questions:
1. What is the largest organ in the human body?
2. What are some of the functions of skin?
3. One of the components of blood is involved with blood clotting.

Which component is this?
4. How is the outermost layer of skin formed again?

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