I) Four reasons why photosynthesis will occur in the set-up:

c)

i) Four reasons why photosynthesis will occur in the set-up:

1. The presence of a potted green plant indicates chlorophyll.
2. Sunlight provides the necessary light energy.
3. Water is available in the pot.
4. Air contains carbon dioxide, which is a reactant.

ii) The role of sunlight in photosynthesis is to provide the energy required for the chemical reaction to convert carbon dioxide and water into glucose and oxygen.

iii) Four steps to test for the main product (starch) of photosynthesis:

1. Boil a leaf from the plant in water for a few minutes to break down cell membranes.
2. Boil the leaf in alcohol (ethanol) in a water bath to remove chlorophyll and decolorize the leaf.
3. Rinse the decolorized leaf in cold water to soften it.
4. Add a few drops of iodine solution to the leaf. A blue-black color indicates the presence of starch.

iv) The by-product of photosynthesis is oxygen.
To test for oxygen:

1. Collect the gas produced by the plant.
2. Insert a glowing splint into the collected gas.
3. If oxygen is present, the glowing splint will relight.