1. Name the colour of dry cobalt chloride paper.

2. Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.

3. Why are glass slides placed over the dry cobalt chloride papers?

4. After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.

Answers:

1. Blue colour

2. Stomata’s minute openings are in the epidermal layer of the leaves. The stomata are surrounded by two bean-shaped guard cells. Most breathing occurs from the bottom of the dicot leaf. There is an opening in the area below the dicot leaf and therefore, most of the transpiration occur from below.

3. Glass slides are placed over dry cobalt chloride sheets to keep the strips in place.

4. After half an hour, the water vapor builds up in its inner walls and the second metal pot (B) will also show the same consistency and at the same time, the first blue cobalt chloride paper on it would turn pink.