SA1 Practice Paper (XN) Booklet A

Dear 6A pupils,

Below are the answer key for Booklet A.

Question 1 (2)

Question 2 (2)
- At point P, % of carbon dioxide is the lowest. This shows that carbon dioxide is used up by the plant. The plant takes in the gas for photosynthesis. Photosynthesis only happens in the presence of light, hence it must be day time at point P.

Quesiton 3 (4)

Question 4 (1)

Question 5 (will go through after next chapter)

Quesiton 6 (simple machine - not in syllabus)

Quesiton 7 (4)

Question 8 (3)

Question 9 (4)

Quesion 10 (4)

Question 11 (2)
Friction (one force) moves in opposite direction of motion (one force).

Question 12 (1)

Quesiton 13 (2)
Guppy give birth to its young alive.

Quesiton 14 (4)
Everything must be kept the same except the type of metal (that is the aim of the experiment)

Question 15 (1)

Quesion 16 (3)
X- digestive juice needs to be produced for the body to digest the food eaten
Y - digested food is absorbed into the blood stream after digestion
Z - water is absorbed at the large intestine

Question 17 (3)
Bulb Y is the bulb that obstruct the current flow from the battery.

Question 18 (2)

Quesiton 19 (3)
Aphids feeds on plants. As Aphids increases, plants will decrease.

Question 20 (2)

Question 21 (4)

Question 22 (3)

Question 23 (1)

Quesiton 24 (3)
With the same amount of heat from the iron block, water in beaker C will show the greatest rise in temperature.
Heat flows from a hotter object to a colder object. In A, the temp of water is 90 but iron block is 80. Heat will flow from the water to the block. Hence in A, the temp of water will drop a little.
As for C and D, the temperature rise in water of beaker D is lower as more need is needed from the iron block to heat up the greater amount of water.

Question 25 (1)

Question 26 (2)

Question 27 (2)
B- decrease in food supply
D- increase in predator

Question 28 (will discuss in next chapter)

Question 29 (will discuss in next chapter)

Question 30 (4)
Temp decrease, the time taken for food to decay is increase (food stayed fresh longer)

That's all.


Happy Revising


Love,
Mdm Goh