Primary 3 Science Life Cycles Quiz

P3 Science Quiz: Life Cycles of Plants & Animals - ANSWERS

Questions: 20
Time: 30 minutes
Total Marks: 40

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Section A: Multiple Choice (12 marks)

Each question carries 2 marks.

1. The correct order for a plant's life cycle is: (2 marks)

Answer: 2 (Seed → Seedling → Plant → Flower → Fruit → Seed)

Explanation: This is the complete plant life cycle. Seeds germinate into seedlings, grow into plants, produce flowers for reproduction, which develop into fruits containing new seeds.

2. Which animal has a 4-stage life cycle? (2 marks)

Answer: 2 (Butterfly)

Explanation: Butterflies have complete metamorphosis with 4 stages: egg → larva (caterpillar) → pupa (chrysalis) → adult butterfly. Grasshoppers have 3 stages (incomplete metamorphosis).

3. What does a caterpillar become during the pupa stage? (2 marks)

Answer: 3 (A butterfly or moth)

Explanation: During the pupa stage, the caterpillar undergoes complete transformation (metamorphosis) to become an adult butterfly or moth.

4. Baby frogs are called: (2 marks)

Answer: 2 (Tadpoles)

Explanation: Young frogs that live in water and breathe through gills are called tadpoles. They later develop legs and lungs to become adult frogs.

5. Which animal goes through metamorphosis? (2 marks)

Answer: 3 (Frog)

Explanation: Frogs undergo metamorphosis, changing from aquatic tadpoles to land-dwelling adults. This involves major body changes like growing legs and developing lungs.

6. Seeds need these things to germinate (start growing): (2 marks)

Answer: 3 (Water, air, and warmth)

Explanation: Seeds need water (to activate growth), air (oxygen for respiration), and warmth (suitable temperature) to begin germinating.

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Section B: Short Answer (14 marks)

Each question carries 2 marks unless stated.

7. Name the FOUR stages in a butterfly's life cycle. (4 marks)

a) Egg (1 mark)

b) Larva (caterpillar) (1 mark)

c) Pupa (chrysalis) (1 mark)

d) Adult (butterfly) (1 mark)

8. What is the difference between a 3-stage and 4-stage life cycle? (2 marks)

Answer: 3-stage life cycle skips the pupa stage; 4-stage life cycle includes a pupa stage where complete transformation occurs.

Explanation: 3-stage = incomplete metamorphosis (grasshopper). 4-stage = complete metamorphosis (butterfly).

9. Complete this plant life cycle sequence: (2 marks)

Seed → SEEDLING → Plant → FLOWER → Fruit → Seed

• First blank: Seedling (1 mark)
• Second blank: Flower (1 mark)

10. Why do flowers exist in a plant's life cycle? (2 marks)

Answer: For reproduction (to make seeds) / To attract pollinators and produce fruits with seeds.

Explanation: Flowers contain reproductive parts that produce seeds after pollination.

11. A chicken's life cycle has these stages. Put them in the correct order: (2 marks)

1. Egg → 2. Chick → 3. Young chicken → 4. Adult chicken

Explanation: Chickens have a simple 3-stage life cycle without metamorphosis.

12. Name TWO things that happen when a tadpole changes into a frog. (2 marks)

a) Grows legs / Develops limbs (1 mark)

b) Loses tail / Develops lungs / Gills disappear (1 mark)

Other acceptable answers: Changes from gills to lungs, develops eyelids, skin changes texture.

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Section C: Investigation & Application (14 marks)

13. Life Cycle Comparison: (6 marks)

Animal	Number of Stages	Stage Names
Butterfly	4	Egg → Larva → Pupa → Adult (2 marks)
Grasshopper	3 (1 mark)	Egg → Nymph (1 mark) → Adult
Chicken	3 (1 mark)	Egg (1 mark) → Chick → Adult

14. Ahmad planted some bean seeds. Observe what happens: (4 marks)

a) What stage is the plant on Day 5? Seedling (1 mark)

Explanation: Small green shoots = early seedling stage.

b) What stage is the plant on Day 20? Adult plant / Flowering plant (1 mark)

Explanation: Plant has flowers, so it's a mature adult plant.

c) What will be inside the green pods? Seeds (1 mark)

Explanation: Pods are fruits that contain seeds for the next generation.

d) What conditions did the seeds need to start growing? Water, air, and warmth / soil, water, appropriate temperature (1 mark)

15. Design an Investigation: (4 marks)

a) What will she compare? Seeds with water vs seeds without water (1 mark)

b) What will she keep the same? Same type of seeds, same amount of light, same temperature, same type of soil (1 mark)

c) What will she observe? Whether the seeds germinate / if shoots appear / growth rate (1 mark)

d) What result do you predict? Seeds without water will not grow / only seeds with water will germinate (1 mark)

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TOTAL: 40 MARKS

Scoring Guide:

• A: 32-40 marks (Excellent understanding of life cycles)
• B: 24-31 marks (Good understanding with minor gaps)
• C: 16-23 marks (Satisfactory, needs review of some concepts)
• D: Below 16 marks (Requires additional support and practice)

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~ End of Answer Key ~