Question

Describe an experiment to demostrate the phenomenon of transpiration

Answer 1

$\huge{ \underline{ \overline{ \mid{ \bold{ \pink{answer}}} \mid}}}$

$\huge \mathfrak \green{to \: demonstrate \: transpiration \: in \: plants:}$

$\bold \blue{procedure:}$

Take two well watered potted plants preferably with broads leaves. Cover each pot completely with a polythene bag. Tie the mouth of polythene bag around the base of stem. Now, cover the plant with a bell jar. Mark it as A. Take another bell jar and mark it B and a third bell jar C. Place strips of dry cobalt chloride paper in the bell jar B and C. Now, you have two set-ups :set up A with a potted plant but no cobalt chloride paper covered with bell jar. Set - up B with plants as well as cobalt chloride paper and set - up C with only a strip of cobalt chloride paper covered with bell jar. Seals the edges of each bell jar with Vaseline so that no air enters the set - up from outside. Keep three sets for one hour in the sun and observe them.

$\large \bold{ \mathtt{ \red{observation:}}}$

Bell jar A shows water vapour condensed on its inner walls. In bell jar B, the blue cobalt chloride paper turns pink. There is neither condensation in bell jar C nor any change in the colour of cobalt chloride paper.

$\large \purple{inference:}$

▪️Condensation of water vapour, and

▪️Change in colour of cobalt chloride paper due to the presence of moisture.