Biology
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?
Photosynthesis
ICSE 2013
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Answer
(i) The aim of the experiment is to show that plants require Carbon dioxide (CO2) for photosynthesis.
(ii) There is no Carbon dioxide (CO2) present inside the flask because KOH absorbs it all.
The leaf inside the flask do not turn blue black when tested with iodine as the leaf inside the flask does not get atmospheric Carbon dioxide (CO2) because KOH absorbs all the Carbon dioxide (CO2) in the flask.
(iii) An alternative chemical that can be used instead of KOH is NaOH (Sodium hydroxide).
(iv) Leaf 1 does not turn blue black at the end of starch test because due to lack of Carbon dioxide (CO2) inside the flask, it is not able to perform photosynthesis and produce starch. Leaf 2 on the other hand, gets atmospheric Carbon dioxide (CO2). Hence, it is able to perform photosynthesis as it turns blue black after the starch test.
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