Jash Kalyani − Profile

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page number: 71,

diagram number: 6.8.

it is photosynthesis you dumb,

due to light the water molecule splits into H⁺ and OH^- ions',

and 4*[OH^-] ions = 2H₂O + O₂.

Hence oxygen given out comes from water.

as due to chlorophyll:

1# Oxygen is produced,

2# starch[food] is produced which is eaten by herbivores[deer] and they are eaten by carnivores[tiger] and thus the food cycle goes on,

3# but suppose if there is no chlorophyll, there will be no oxygen nor any production of food taking place due to which there will be no deer to hunt for the tiger and it will die. 

Hence, the tiger owns its existance to chlorophyll.

1# she added iodine to the leaf.

2# the part of the leaf turning blue-black contained starch.

3# the part of the leaf turning brown did not contain starch.

4# the part of the leaf turning brown was covered with the black paper before this experiment.

5# this showed that sunlight was necessary for photosynthesis[ starch formation ] to occur.

to remove the starch produced by the leaf before the experiment.

yes, a leaf not covered by any paper.

sunlight is necessary for photosynthesis.