In terms of cellular respiration, why do we need oxygen and why do we exhale carbon dioxide?Cells need oxygen in order to generate energy in the form of ATP.
In cellular respiration, pyruvic acid molecules must react with oxygen molecules to generate energy, at the same time will produce carbon dioxide and water. People, and other animals for this matter, exhale carbon dioxide because the body must release the excess carbon dioxide produced during cellular respiration.2.) Only some plant cells have chloroplasts, but all living plant cells have mitochondria. Why?Chloroplasts are found only in the leaves of most plants and is necessary for photosynthesis.
It is responsible for capturing energy from sunlight and is found only where the plant could most receive sunlight. On the other hand, mitochondria are essential in all plant cells as they are involved in other cellular processes such as signaling, cellular differentiation, and cell death.The mitochondria are also involved with the control of cell cycle and cell growth. It must be noted the mitochondria is responsible for generating most of the cell’s supply of energy in the form of ATP and that all the other processes performed by it could not be performed by the chloroplast.3.1) About how much energy did ethanol produce from one hectare of corn yield? How much energy did it take to grow and produce that ethanol?Ethanol was able to produce about 22-23 units of energy (kcal x 106) for every hectare of corn yield while needing around 18 units of energy.3.2) Which biofuel tested had the highest ratio of energy output to energy input.Grass synfuel has the highest ratio of energy output to energy input, measuring 8.09 on the ratio as compared with 1.25 energy ratio from corm yield and 1.93 from soy.3.3) Which of the three crops would the least amount of land to produce a given amount of biofuel energy.Given the highest energy output for each hectare of land, corn would require the least amount of land to produce a given amount of biofuel energy.;