CBSE Class 10 Science Activities Part (3)

Heredity and Evolution Chapter 9

Assessment Technique Activity based Worksheet

Introduction: Industrial Melanism is a term used to describe the adaptation of a population in response to pollution. One example of rapid industrial melanism occurred in populations of peppered moths in the area of Manchester, England from 1845 to 1890. Before the industrial revolution, the trunks of the trees in the forest around Manchester were light grayish-green due to the presence of lichens. Most of the peppered moths in the area were light colored with dark spots. As the industrial revolution progressed, the tree trunks became covered with soot and turned dark. Over a period of 45 years, the dark variety of the peppered moth became more common.

Objectives: To enable the students to

● Describe the importance of coloration in avoiding predation

● Relate environmental change to adaptive changes in organisms

● Explain how natural selection causes populations to change over a period of time

● Analyze how colour affects the organism’s ability to survive in certain environments

Task : Group activity (2 students) followed by Individual worksheet 

Approximate Time: 30 minutes (15 minutes for activity and 15 minutes for worksheet)

Procedure : In lab, teacher may simulate how predators locate prey in different environments. Teacher may tell students about Industrial Melanism in England.

Then the students may be asked to perform the following activity:

1. Cut 30 circles from newspaper and 30 circles from white sheet (can be made with punching machine ). These are symbolic of two types of Moths.

2. Place a sheet of white paper on the table and have one student spread 30 white circles and 30 newspaper circles over the surface. Ensure that the other student) isn’t looking.

3. The other student is a “predator”, who will now use forceps to pick up as many of the circles as he can in 15 seconds.

4. Record your data in the row for ‘trial 1’ in the table.

5. Repeat this activity and record your data in the row for ‘trial-2’ in the table.

6. Repeat this trial with 30 white circles and 30 newspaper circles on a newspaper background.

7. Record your data in the row for ‘trial 3’ in the table.

8. Repeat this activity and record your data in the row for ‘trial-4’ in the table.

Please refer to attached file for CBSE Class 10 Science Activities Part (3)


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