Photosynthesis-Cellular Respiration

By; Bhargavi Sarangapani- Period 5

Photosynthesis- An Introduction

Photosynthesis occurs in a plant cell, more specifically in the chloroplast of the cell. For example, in a rose bush, every individual leaf needs H2O (water), CO2 (carbon dioxide), and light energy. Through a series of cycles and steps, the leaf eventually produces glucose (C6H12O6) and six molecules of oxygen (6O2). Carbon dioxide first enters the stomata in the leaf, as the light energy from the Sun is absorbed in the thylakoid. Water also enters the roots of the stem of the plants, as it is transported to the leaves in order to start photosynthesis. A light dependent reaction then occurs in the thylakoid, where both H2O splits into hydrogen and oxygen, and then producing oxygen and ATP. Lastly, in the stroma of the chloroplast, light- independent reactions occur where the ATP is used to produce carbohydrates.
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Cellular Respiration

Cellular respiration contains two categories (anaerobic and aerobic) which take its process in an animal, like a panda. In aerobic cellular respiration, oxygen must be present for sugars (carbohydrates) to be broken down. Both carbon dioxide and water are released in this process. The reactants for aerobic respiration are oxygen- (O) and glucose, as the products are CO2, H2O, and ATP.
Just as photosynthesis occurs in the chloroplast of a plant cell, cellular respiration occurs in the mitochondria of an animal cell. The steps are as follows:
  • Glucose enters the cell through facilitated diffusion, as glycolysis breaks down the 6 carbon glucose into two 3 carbon pyruvates.
  • 2 ATP are produced in the cytoplasm in this process.
  • When the Kreb's Cycle happens in the mitochondria, it emits 2 ATP (4 in total so far) and carbon dioxide.
  • The electron transport chain occurs across the inner membranes of the mitochondria, producing H2O and 32 ATP.... a lot of energy!!


Anaerobic respiration, on the other hand, does not require oxygen when there is not enough oxygen for aerobic respiration to occur. However, there are two types of fermentation it goes through to continue making ATP (2 to 4) with glycolysis; both being lactic acid fermentation and alcoholic fermentation. Glucose is the main energy source.

When a human being exercises, or when a panda walks for a long period of time, lactic acid builds up.

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Similarities Between Both Cellular Respiration and Photosynthesis

Photosynthesis and cellular respiration both produce energy and ATP, and cellular respiration also occurs in plants and animals. However, sunlight is not required in cellular respiration as it is required in photosynthesis. However, a rose bush (the leaves) produce glucose and oxygen while the mitochondria in a panda produces carbon dioxide, water, and ATP energy. Like photosynthesis, cellular respiration has 3 stages too. In cellular respiration, the water gets transported in the small intestine; the oxygen that the lungs breathe in breathes out carbon dioxide in this process. In addition, photosynthesis produces glucose to "feed" the plant and help it grow.
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Mrs. McDowell's lecture on Photosynthesis and Cellular Respiration

“Fertilize Roses.” Heirloom Roses. Web. 6 Dec. 2015. <>

“Panda - Curiositysip.” Curiositysip. N.p., 2015. Web. 6 Dec. 2015. <>

“Photosynthesis Vs Cellular Respiration.” - Difference and Comparison. Web. 6 Dec. 2015. <>

“Respiration Glycolysis | Aerobic Respiration | Anaerobic Respiration.” ⚡Presentation ".". Web. 6 Dec. 2015. <>