2017 P5 SA2 Examination Suggested Answer Set

Errata Sheet

2017 P5 SA2 Examination Paper – Anglo-Chinese School (Junior) (Q26b)

Both the young and the adult of the cockroach have 6 legs/ 3 body parts.

2017 P5 SA2 Examination Paper – Methodist Girls’ School (Q42a)

Step 1: When the metal ring touches the thick metal structure…

2017 P5 SA2 Examination Paper – Methodist Girls’ School (Q42c)

… Step 3: preventing electric current from flowing through the buzzer and the bulb.

Step 4: Thus, the buzzer would not sound, and the bulb would remain unlit.

2017 P5 SA2 Examination Paper – Singapore Chinese Girls’ School (Q37a)

No. Comparing Set-ups A and D, there is more than one changed variable in the experiment. In Set-up A, there are more plants but it has a bigger pot than Set-up D.

2017 P5 SA2 Examination Paper – Tao Nan School (Q4)

Answer “I“

2017 P5 SA2 Examination Paper – Tao Nan School (Q31b(i))

At the lungs, the carbon dioxide in the blood is removed and exhaled, causing the amount of carbon dioxide in P to be more than Q.

2017 P5 SA2 Examination Paper – Catholic High School (Q33b)

Choose one of the following amended answers:

• Move the lamp closer to the plant. This allows the plant to receive more light for a faster rate of photosynthesis to make more food and release more oxygen, forming more bubbles.
• Put more water plants in the beaker. More plants would trap light for photosynthesis to make food and release more oxygen, forming more bubbles.
• Add baking soda to the water to increase the amount of carbon dioxide in the set-up. This allows the plant to take in more carbon dioxide for a faster rate of photosynthesis to make more food and release more oxygen, forming more bubbles.