cikgupoon: 2010 PMR Science Paper 2 (Continuation)

3. (a) Diagram 3 shows two jars, P and Q, containing fish. Both the jars are placed in a room.

(i) In which jar will the fish die first? - P

(ii) Give two reasons for the answer in 3(a)(i).

1: Shortage/no oxygen/air 2 : No food

(b) Explain why the fish in one of the jars can still be alive after two days.

Has water weed/plant that supplies oxygen

To get air/oxygen// to breath

4 (a) Diagram 4.1 shows a pond ecosystem.

(i) Write the name of one population that is a part of this pond ecosystem.

Water weed//lotus//plant //fish //frog//tadpole//toad//dragonfly//mosquito larva

(ii) State one producer.

Water weed//lotus//plant

(iii) Give one reason for the answer in 4(a)(ii).

Produces its own food// supply food// undergoes photosynthesis

(b) Diagram 4.2 shows a food web in an oil palm estate. The number for each type of the organisms is shown in the bracket.

Based on Diagram 4.2:

(i) Construct any one food chain which consists of four organisms in this habitat.

Oil palm tree--> grasshopper --> frog --> snake //

Oil palm tree--> caterpillar --> cock --> eagle //

Oil palm tree--> caterpillar --> sparrow --> snake

(ii) Complete the following pyramid of numbers in Diagram 4.3 using the food chain constructed in 4(b)(i).

Eg : Snake ------> 8

        frog       ------> 80
        grasshopper--> 700
        Oil palm tree-->6000
To be continued........

cikgupoon