connecting cellular respiration and photosynthesis

connecting cellular respiration and photosynthesis

Photosynthesis and cellular respiration are connected through an important relationship. This relationship enables life to survive as we know it. The products of one process are the reactants of the other. Notice that the equation for cellular respiration is the direct opposite of photosynthesis: Cellular Respiration: C6 H12 O6 + 6O2 6CO2 + 6H2 O Photosynthesis: 6CO2 + 6H2 O C6 H12 O6 + 6O2 Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water. While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration. We breathe in that oxygen, which is carried through our blood to all our cells. In our cells, oxygen allows cellular respiration to proceed. Cellular respiration works best in the presence of oxygen. Without oxygen, much less ATP would be produced. Cellular respiration and photosynthesis are important parts of the carbon cycle. The carbon cycle is the pathways through which carbon is recycled in the biosphere. While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere. The exchange of carbon dioxide and oxygen during photosynthesis ( Figure 1.1) and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at stable levels. Cellular respiration and photosynthesis are direct opposite reactions. Energy from the sun enters a plant and is con- verted into glucose during photosynthe- sis. Some of the energy is used to make ATP in the mitochondria during cellular respiration, and some is lost to the envi- ronment as heat.

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questions

the products of cellular respiration are the reactants of photosynthesis.

-->  a. true

b. false

cellular respiration and photosynthesis are important processes in the recycling of carbon.

-->  a. true

b. false

what is needed by our cells to allow aerobic cellular respiration to proceed?

-->  a) oxygen

b) water

c) atp

d) carbon dioxide

which statement is not true concerning photosynthesis?

a) photosynthesis occurs in the chloroplast.

b) light energy from the sun changes to chemical energy in glucose.

-->  c) chemical energy in glucose is converted to chemical energy in atp.

d) light energy is used to make glucose and oxygen.

which statement is not true concerning cellular respiration?

a) cellular respiration occurs in the mitochondria.

b) carbon dioxide is formed, and the it can be used in photosynthesis.

c) chemical energy in glucose is converted to chemical energy in atp.

-->  d) light energy is used to make atp.

what is an outcome from a lack of oxygen?

-->  a) much less atp is produced.

b) much less glucose is produced.

c) much less water is used.

d) all of the above

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