2. Write a detailed conclusion based on your results. How does light and sodium bicarbonate impact the rate of photosynthesis in spinach leaf discs? 3. Identify the controls used in this experiment. Which control is positive, and which control is negative?

The light source gives light energy, this solution gives water, and sodium bicarbonate gives CO2 in dissolved form.  

The leaf disc/plate utilizes light energy for photosystem II and I for their ATP and NADPH creation and sodium carbonate gives CO2 to Calvin cycle. SO photosynthesis will take place.  

conclusion -  

The Positive control here, the light and Co2 level continuously increment so in a medium the photosynthesis is increased.  The leaf disc are floating at first after sometime CO2 are utilized so there is lack of CO2 it not ready to experience photosynthesis the disc began to settle down.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms