Question

The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet ‘A’ represents a certain condition inside the flask.

(i) What is the aim of the experiment ?

(ii) Identify the special condition inside the flask.

(iii) Name an alternative chemical that can be used instead of KOH.

(iv) In what manner do the leaves 1 and 2 differ at the end of the starch test ?

Answer 1

(i) To prove that CO₂ is necessary for photosynthesis.

(ii) No CO₂ in the flask.

(iii) CaO (limestone), potassium pyrogallate.

(iv) Leaf 1, no change in colour with starch list.

Leaf 2, will turn blue black at the end of starch test.