Banu's blog for school students

Answer: If the plant would be in the sunlight it would simply produce more starch and then it would store it in it's leaves or other parts. If the plant is kept in the dark room then simply the plant would stop producing the glucose and the it would use up all the starch in it and the plant would become starch less

Experiment to demonstrate that light is necessary for the process of photosynthesis: Requirements: L ight screen, a potted plant and iodine. Method: 1. Take a potted plant and make its leaves destrached by keeping it in dark for one or two days. 2. Fix a leaf of this plant in between the Ganong’s screen. 3. In the black paper or black tin foil disc of the screen, cut a pattern of some kind (like P) and fix it on the screen. 4. Keep the whole apparatus in sunlight. Due to this light screen, some parts of the leaf are covered whereas other remaining parts are exposed to light. 5. Remove the leaf from the screen after a few hours, and test for starch with the help of iodine.  Observations In the region of the letter ‘P’ the leaf shows positive iodine test.  Results: The observations indicate that the iodine test is positive only in the regions of the leaf which were exposed to sunlight (P) while on the other hand the unexposed regions show negative iodine test for starch. Because the...

Experiment to demonstrate that oxygen is evolved during the process of photosynthesis: Answer Requirements: Beaker, water, test tube, funnel, Hydrilla plant. Method: 1. Fill the beaker with the water and take an aquatic plant, such as Hydrilla, in the beaker. 2. Cut the bases of the plants, tie them with a thread and cover them with an inverted funnel in such a fashion that the cut ends of plants are towards the neck of the funnel.  3. Fill a test tube with the water and invert it on the upper end of the funnel. 4. Keep the whole apparatus in sunlight and observe for some time. Observations: From the cut ends of the plant some bubbles are coming out continuously and they are collected at the top of the test tube by displacing the water.  Test for the gas: To test the gas released, bring a burning match stick near the mouth of the test tube which would burst into flames. This shows that the gas released is oxygen.  Results: The liberated gas is oxygen and it is evolved due...