Primary 3 Science Systems Quiz

Primary 3 Science Quiz - Systems (Answer Key)

Total Marks: 20

Section A: Multiple Choice Questions

1. (2)

• Explanation: All living things need air, food, and water to survive. Not all living things move from place to place (e.g., plants), have legs (e.g., snakes, fish), or are green (e.g., animals, fungi).

2. (2)

• Explanation: A growing bean plant (A) and a cat (C) are living things because they grow, reproduce, and need basic needs. A toy robot (B) is non-living (man-made). A river (D) is non-living (natural but does not reproduce or grow biologically).

3. (3)

• Explanation: Living things grow and reproduce. A car cannot do these things. It moves using fuel, but movement alone does not make something living.

4. (4)

• Explanation: Roots anchor the plant and absorb water and minerals from the soil. Leaves make food, stems transport water, and flowers are for reproduction.

5. (2)

• Explanation: The stem supports the plant (holds it upright) and contains tubes to transport water and minerals from the roots to the leaves, and food from the leaves to other parts.

6. (2)

• Explanation: The cockroach has a 3-stage life cycle: Egg $\rightarrow$ Nymph $\rightarrow$ Adult. The butterfly and frog have 4 stages. The chicken has 2 main stages (Egg $\rightarrow$ Chick/Adult) but is often taught as hatching from an egg; however, in P3, insects are the primary focus for 3 vs 4 stages. Cockroach is the standard example for 3 stages.

7. (1)

• Explanation: The butterfly life cycle is: Egg $\rightarrow$ Larva (Caterpillar) $\rightarrow$ Pupa $\rightarrow$ Adult. The stage between egg and pupa is the larva.

8. (3)

• Explanation: Humans do not have a pupa stage. Pupa is a stage in the life cycle of insects like butterflies and moths. Human stages are Baby, Child, Teenager, Adult, Elderly.

9. (2)

• Explanation: Plants use sunlight, water, and carbon dioxide to make their own food through a process called photosynthesis.

10. (3)

• Explanation: Fungi are living things because they grow, reproduce, and need air/water/food. However, they are not plants because they cannot make their own food (they do not have chlorophyll).

Section B: Structured Questions

11. (a) A: Root, B: Stem, C: Leaf, D: Flower [2]

• Marking: 0.5 marks for each correct label. (b) C (Leaf) [1]
• Explanation: Leaves contain chlorophyll and trap sunlight to make food for the plant.

12. (a) P [1] (b) It shows all three characteristics of living things: it needs water, grows, and reproduces. [1]

• Note: Accept "It grows and reproduces" as the key differentiators from non-living things that might "need" maintenance. (c) A sponge / A piece of wood / A dried seed (before germination) [1]
• Explanation: Any non-living thing that absorbs water but does not grow biologically. A sponge is a common example.

13. (a) 3 [1] (b) The nymph does not have wings, while the adult has wings. (Or: The nymph is smaller than the adult). [1] (c) No. [1]

• Explanation: Metamorphosis involves a drastic change in form (like caterpillar to butterfly). The nymph looks like the adult, so it is incomplete metamorphosis, but in P3 terms, we often distinguish "metamorphosis" as the 4-stage drastic change. Correction for P3 Level: Simply stating "No, because the young looks like the adult" is sufficient.

14. (a) (2) [1] (b) The plant needs sunlight to make food. Without sunlight, it cannot make food and the leaves will turn yellow and die. [1]

15. (a) No [1] (b) It cannot make its own food. (Or: It does not have leaves/chlorophyll). [1]

• Explanation: Plants make their own food. Fungi get food from decaying matter.

16. (a) X (Tadpole) [1]

• Note: Stage W (Eggs) are also in water, but X is the active living stage fully aquatic. Accept W or X if justified, but X is the distinct feeding stage. (b) Y (Young frog) [1]
• Explanation: As the tadpole develops legs and lungs (Stage Y), it begins to breathe air.

17. [3]

• Marking: 0.5 marks for each correct animal placement.
• Group A (Eggs): Chicken, Butterfly, Fish, Eagle (Any 3)
• Group B (Give Birth): Cat, Dog (Any 2 - wait, the question asks to classify the list. The list has 6 items. 4 lay eggs, 2 give birth. The table has 3 slots each. This is a trick. Let's re-read the list: Cat, Chicken, Butterfly, Dog, Fish, Eagle.
  • Eggs: Chicken, Butterfly, Fish, Eagle.
  • Birth: Cat, Dog.
  • Correction in Question Design: The table has 3 slots per group. There are 4 egg-layers and 2 live-birthers. Students should fill the slots available.
  • Group A: Chicken, Butterfly, Fish (or Eagle)
  • Group B: Cat, Dog (Leave one blank or repeat? No, usually lists match. Let's assume the student picks any 3 for A and the 2 for B. Or perhaps "Fish" is ambiguous in P3? No, fish lay eggs. I will accept any 3 correct egg-layers in A and the 2 correct live-birthers in B. If a student puts Eagle in A, it is correct.)

18. To ensure their kind continues to exist / To prevent extinction. [1]

19. (a) Living thing [1]

• Explanation: It was a seed. Seeds are living things even if they appear dormant. (b) It grows. [1]

20. (a) Plant [1]

• Explanation: It makes its own food and does not move by itself. (b) Animal [1]
• Explanation: It cannot make its own food and moves by itself.