Previously you have performed the activity of observing a branch covered in a plastic bag. What did you observe in that activity?

Dip a chalk in ink.what do you observe?

What do you observe in the following Pictures?:

Name the properties of crystalling solids that you observed in this activiy.

Answer the following questions: Take a large shining metal spoon. Bring the deeper(i.e., concave) surface closer to your face. Can you see your image? Now take the spoon away from your face. What change do you observe in the image? Now repeat the activity by turning the convex surface of the spoon to the front. What changes do you notice in the image?

How did you observe microbes?

Observe a permanent slide of blood smear under a compound microscope. What did you see?

If distance covered by a particle is zero, what can you say about displacement?

Answer the following questions: When an object is moved from the centre of curvature of a concave mirror towards its focus, what change do you observe in the size of the image?

While performing an experiment, to understand effect of pH on enzyme activity, a student prepared solution of varied pH. He observed that enzyme activity is maximum at a particular range of pH. What is the reason for its maximum activity at a particular range of pH? What would be the effect on enzyme activity if strong acid or strong base is added?