# Experiment 12.1 (Form 5 Biology Textbook Exercise and Answer)

Continuous and Discontinuous Variation in Humans:
Problem statement: Is the height, body weight and fingerprint of each pupil different?

Aim: To study continuous variation and discontinuous variation in humans

Hypothesis: Height, body weight and fingerprint of each pupil is different.

Materials
Graph paper, white papers

Apparatus
Height measuring equipment, weighing machine, ink pad

Procedure
A. Height
1. Measure and record height of each pupil in the class in the results table.
2. Plot a graph of number of pupils against height range.

B. Body weight
1. Weigh and record body weight of each pupil in the class in the results table.
2. Plot a graph of number of pupils against body weight range.

C. Fingerprint
1. Use the fingerprint patterns shown in page 259 for this activity.
2. Place a thumb surface of each pupil on an ink pad, then press the thumb on a piece of white paper.
3. Record the thumbprint pattern of each pupil in the results table.
4. Build a bar chart based on the results obtained.

Results

Discussion
1. What are the shapes of the graphs plotted for height and body weight?

2. Give inferences for distribution of height, body weight and thumbprint pattern of the pupils in your class.

Conclusion
Is the hypothesis accepted? Suggest a suitable conclusion.