Primary 3 Science · Investigation worksheet

Life Cycles of Plants

Name:Date:Marks: / 20

Section A · Multiple choice 8 marks

1. Look at Figure 1. How tall was Plant A on Day 4?1 mark

Figure 1: Height of three bean seedlings (cm)

Plant	Day 2	Day 4	Day 6	Day 8
Plant A	2	5	9	14
Plant B	1	3	6	8
Plant C	1	3	8	16

(A) 2 cm(B) 5 cm(C) 9 cm(D) 14 cm

2. Look at Figure 1. Which plant was the tallest on Day 8?1 mark

Figure 1: Height of three bean seedlings (cm)

Plant	Day 2	Day 4	Day 6	Day 8
Plant A	2	5	9	14
Plant B	1	3	6	8
Plant C	1	3	8	16

(A) Plant C(B) Plant A(C) Plant B(D) All the plants were the same height

3. Look at Figure 1. By how many centimetres did Plant B grow from Day 2 to Day 6?1 mark

Figure 1: Height of three bean seedlings (cm)

Plant	Day 2	Day 4	Day 6	Day 8
Plant A	2	5	9	14
Plant B	1	3	6	8
Plant C	1	3	8	16

(A) 6 cm(B) 4 cm(C) 3 cm(D) 5 cm

4. The three cards in Figure 2 show stages of a plant. Which order shows the life cycle starting from the seed?1 mark

Figure 2: Three stages of a plant

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

5. Which part of an adult plant holds seeds?1 mark

(A) The leaf(B) The fruit(C) The stem(D) The soil

6. Look at Figure 3. Which young living thing does NOT look like its adult?1 mark

Figure 3: Some young living things and their adults

Living thing	Young	Adult
Chick and hen	Fluffy feathers, two legs, a beak. Lives on land.	Feathers, two legs, a beak. Bigger. Lives on land.
Tadpole and frog	Has a tail and no legs at first. Lives in water.	Has four legs and no tail. Lives on land and in water.
Puppy and dog	Four legs, fur, a tail. Lives on land.	Four legs, fur, a tail. Bigger. Lives on land.

(A) Tadpole(B) Chick(C) Puppy(D) All of them look like their adults

7. Why is it important for living things to reproduce?1 mark

(A) So the young never change(B) So the adult can stay small(C) So plants can stop making seeds(D) So living things of the same kind continue to exist

8. Look at Figure 4. When did Plant D grow the most?1 mark

(A) Day 2 to Day 4(B) Day 6 to Day 8(C) Day 4 to Day 6(D) Day 8 to Day 10

Section B · Show what you know 12 marks

9. Look at Figure 1. Describe how the height of Plant A changed from Day 2 to Day 8. Then predict its height on Day 10: will it be shorter than, the same as, or taller than 14 cm?2 marks

Figure 1: Height of three bean seedlings (cm)

Plant	Day 2	Day 4	Day 6	Day 8
Plant A	2	5	9	14
Plant B	1	3	6	8
Plant C	1	3	8	16

10. Look at Figure 2. Write the life-cycle stages in the correct order, beginning with the seed. Then name the part that the adult plant makes so that the cycle can start again.2 marks

Figure 2: Three stages of a plant

11. Look at Figure 3. Choose one of the animals. Say whether its young looks like its adult or looks different, and give one piece of evidence from the table.2 marks

Figure 3: Some young living things and their adults

Living thing	Young	Adult
Chick and hen	Fluffy feathers, two legs, a beak. Lives on land.	Feathers, two legs, a beak. Bigger. Lives on land.
Tadpole and frog	Has a tail and no legs at first. Lives in water.	Has four legs and no tail. Lives on land and in water.
Puppy and dog	Four legs, fur, a tail. Lives on land.	Four legs, fur, a tail. Bigger. Lives on land.

12. Sam planted a seed in a bag and measured it. Look at Figure 5. Sam says, "My plant is only a tiny seedling, so it is not growing." Do you agree? Use the numbers to explain.2 marks

Figure 5: Sam's seed diary (height in cm)

Day 2	Day 4	Day 6
1	3	7

13. Mrs Lim ate a mango and planted its seed. Explain how this seed can lead to more mangoes in the future.2 marks

14. Look at Figure 1. Which plant, A or C, grew more from Day 2 to Day 8? By how many centimetres more?2 marks

Figure 1: Height of three bean seedlings (cm)

Plant	Day 2	Day 4	Day 6	Day 8
Plant A	2	5	9	14
Plant B	1	3	6	8
Plant C	1	3	8	16

Shukr Learns · free practice for parents and children · original questions, not affiliated with any school or agency