PL AR RSO P4L4 Life Cycles in Plants WS

Primary 4

Rocket Science OEQ

Name __________________________________________________
Tutor
Topic LIFE CYCLES IN PLANTS (LESSON 4)

__________________________________________________

LIFE CYCLES IN PLANTS (LESSON 4)

Primary 4: Rocket Science OEQ

LESSON OUTLINE
• Notes
• Activity 1: Concept Recall
• Activity 2: Open-ended Questions
• Activity 3: Science in Daily Life

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Primary 4: Rocket Science OEQ

LIFE CYCLES IN FLOWERING PLANTS – NOTES

FLOWERING PLANTS
• Are plants that produce flowers and fruits.

• Fruits contain seeds
• Seeds grow into new plants

STAGES IN THE LIFE CYCLE OF A FLOWERING PLANT
• The seed
• The young plant
• The adult plant

AR Model – Plant

PARTS OF A SEED
• Seed Coat protects the seed and prevents it from being digested by

animals if they eat it.
• Seed Leaf protects the baby plant and provides food for the seedling

before it grows leaves to make its own food.
• Not a real leaf, it contains stored food.
• The mass of a seed leaf decreases with time as the plant grows real
leaves to make its own food.

GERMINATION
• When a seed grows into an adult, it germinates.
• A seed requires water, oxygen, and warmth in order to germinate.

STEPS THAT TAKE PLACE DURING GERMINATION
1. The seed swells during germination before it absorbs water.
2. The first part of the seedling to emerge is the root, in order to absorb

more water and anchor the seedling into the soil.
3. Next, the shoot emerges.
4. Leaves appear. At this point, the seedling will need sunlight to make

food via photosynthesis.
5. The seed leaf is no longer needed, withers and falls off.

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Primary 4: Rocket Science OEQ

Activity 1 – Concept Recall , the seed needs the following conditions:

Fill in the blanks below.
1. In order to g

W
O
W

2. Before they grow true leaves, s get energy to grow from

food stored in the s .

3. S use the process of r to release

energy for the growth of the seedling.

4. Before they grow true leaves, s get energy to grow from food

stored in the s .

5. S use the process of r to release energy

for the growth of the seedling

6. When a seed g , it will swell from absorbing water from
the soil around it.

7. Next, r grow from the seed to absorb water from the soil.
8. After that, the s appears and grows taller. As it grows, the

first leaves appear and can make food for the plant in the presence

of s .
9. As the s makes more of its own food, it will no
for food. The s
longer depend on the s
will wither and drop off

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Primary 4: Rocket Science OEQ

Activity 2 – Open-ended Questions
1. The diagram below shows stages of the life cycle of a bean plant. The

stages are not in order.

ABC

DEF

In the boxes below, arrange the stages A, B, C, D and E in the correct

order. [1]

F

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2. The diagram below shows an adult plant. Primary 4: Rocket Science OEQ
(a) Identify parts (i) and (ii).
[1]

(i)
(ii)

(b) State one function of the part that you have identified in (b)(i). [1]

(c) Jacob examines the plant above and concludes that it is an adult [1]
plant.

Do you agree with Jacob? Give a reason for your answer.

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Primary 4: Rocket Science OEQ

3. The diagram below shows a plant growing in the garden.

Wooden Pole A
Fruit
(a) The plant is a flowering plant.
Do you agree? Explain your answer. [2]

(b) Besides warmth, name two conditions needed for a seed to grow. [ 1 ]

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Primary 4: Rocket Science OEQ

(c) Can the plant function properly if part A is missing? [1]
Explain your answer.

(d) Why does the plant need support from the wooden pole? [1]

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Primary 4: Rocket Science OEQ

4. The classification chart below shows how plants are classified.
Plants

P Q
Produces flowers Does not produce flowers

Bears edible fruit Bears inedible fruit

Apple Tree English Ivy Plant Fern

(a) Give suitable headings to P and Q. [1]
P: [2]

Q:

(b) Based on the classification chart, what is one similarity and one
difference between the English Ivy plant and the fern?

(c) Give an example of another plant that reproduces in the same [1]
way as an apple tree.

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Primary 4: Rocket Science OEQ

Activity 3 – Science in Daily Life: Tour of Hort Park Edible Garden

https://www.youtube.com/watch?v=cGJKYYulB1E
DISCUSSION QUESTIONS
1. Do you know what kinds of vegetables grow in Singapore?
2. What are some challenges farmers face when growing
vegetables when the plant is at:
• The seed stage
• The young plant stage
• The adult stage
3. Why is it useful to solve these challenges?

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Primary 4: Rocket Science OEQ

Activity 3 – Science in Daily Life: Tour of Pasir Panjang Nursery

https://www.youtube.com/watch?v=xQUgM3Rx1bg
DISCUSSION QUESTIONS
1. Where do you think the trees and flowers you see by the
side of the road come from? Do they grow wild, or were
they planted?
2. Why do you think we need to plant them in a nursery?
3. Why do you think it’s important for people who plant them
to understand plant life cycles?

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