|
|
1. The metabolic processes of cellular respiration and photosynthesis recycle oxygen, as it is a reactant in respiration and a product in photosynthesis. Oxygen is released to the atmosphere by autotrophs during photosynthesis and taken up by both autotrophs and heterotrophs during respiration. It is a reactant in cellular respiration and used as the last receptor in the Electron Transport Chain, where the NADH drops off hydrogen ions, finally to the oxygen. The oxygen and hydrogen become water, which is a reactant in photosynthesis. This water is oxidized into oxygen during the light reactions carried out in photosynthesis. The light reactions use light to split apart water, a process called photolysis, which produces oxygen, hydrogen and electrons. This continual cycle of using up oxygen and then creating it again is what recycles it and helps to maintain stability in the processes and in the environment. 2. The rate of photosynthesis varies greatly with changes in environmental temperature in plants. a. To determine the effect of temperature on the rate of photosynthesis in plants, you would first need to formulate a hypothesis.
|
