1. A group of student carried out an experiment to determine the population of Helianthus sp. in Padang Merdeka.The result of their experiment were recorded in Diagram 1.1.

(a) Name the technique used in studying the distribution of Helianthus sp. ________________________________________________________________________

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[3 marks](b) (i) Based on the information in Diagram 1.1 complete Table 1.Quadrate 1 2 3 4 5 6 7 8 9 10Cover of Helianthus sp.

Table 1[3 marks]

(ii) Calculate the percentage cover of Helianthus sp.

[3 marks](c) (i) Based on the information in Diagram 1.1 complete Table 2 on the frequency of Helianthus sp. Quadrate 1 2 3 4 5 6 7 8 9 10Helianthus present or absent

Table 2[3 marks]

(ii) Calculate the percentage for the frequency of Helianthus sp.

[3 marks]

(iii) Based on the frequency, what inference can be made?________________________________________________________________________

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[3 marks]

(d) Complete Table 3 based on the experiment that was carried out. Variables Particulars to be determine

Manipulated variable: How to implement the manipulated variable:

Responding variable: How to determine the responding variable:

Controlled variable: How to maintain the controlled variable:

Table 3[6 marks]

(e) What can be done to make the results obtained more accurate?

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[3 marks]

(f) Give one conclusion from this experiment.

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[3 marks]

(g) This group of students plan to carry out another experiment to study the population of snails in Padang Merdeka. Can the students use the same technique? Give a reason for your answer.

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[3 marks]

Answer.

1 (a) Quadrate sampling technique.

(b)(i)Quadrate 1 2 3 4 5 6 7 8 9 10Cover of Helianthus sp.

0.6 0.4 0.4 0.5 0.5 0.5 0.2 0.3 0.2 0.4

(ii) Percentage cover of Helianthus sp. = 40%

(c)(i)Quadrate 1 2 3 4 5 6 7 8 9 10Helianthus present or absent

Present Present Present Present Present Present Present Present Present Present

(ii) Percentage of frequency = 10/10 X 100% = 100%

(iii) Helianthus can be found in all areas of Padang Merdeka. The distribution of Helianthus in Padang Merdeka is consistent.

(d)Variables Particulars to be determine

Manipulated variable:Location of quadrate

How to implement the manipulated variable:Systematic sampling is chosen

Responding variable:Coverage of quadrate

How to determine the responding variable:Make sure every area covered by Helianthus sp. in the quadrate in measured

Controlled variable:Size of quadrate

How to maintain the controlled variable:Make sure all the quadrate must be separated and measure at 1m X 1m

(e) More quadrate set up to cover more area in Padang Merdeka.

(f) The percentage coverage of Helianthus sp. in Padang Merdeka is 40% and the percentage frequency is 100%.

(g) This technique cannot be used to study the population of snail in Padang Merdeka. This is because snails move around and will not stay immobile in Padang Merdeka.