The evolution of photosynthesis occurred more than three billion years ago. What important effect did this have on the enfiroment that led to the evolution of aerobic respiration?
1. it allowed for great diversity of plant life as food for evolving heterotrophs
2. It produced the water necessary for aerobic respiration to evolve
3.The heat energy released from the pathway increased the Earth's temperature
4. The oxy released as a byproduct changed the atmosphere.
i'm leaning more towards B, but what do you think??
2007-04-06 04:24:43 · 4 answers · asked by shandaraj 2 in Science & Mathematics ➔ Biology
Yeah just for a second opinion I agree with the guy above me. #4 is the correct response. Aerobic respiration should hint right away that it uses oxygen...so obviously the response involving oxygen is correct.
Respiration is
C6H12O6+O2-->H20+CO2 so the photosynthetic organisms did not produce water...respiration has water has a product
photosynthesis is
H2O + CO2-->C6H12O6+O2
They are opposite so #2 is wrong
It has nothing to do with diversity, so that's off right away and the heat energy one just needs to be eliminated
2007-04-06 04:32:56 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The answer is 4:
The oxygen released as a byproduct changed the atmosphere.
The primordial atmosphere contained no oxygen. Photosynthesis alone changed it into an oxygen atomosphere, which allowed the formation of all other animal life on the planet.
(2) is wrong, plants do not produce water, and aerobic respiration requires oxygen not water.
(3) is negligible, the heat produced by the sun and geothermal processes are by far greater than anything produced by plants or animals.
(1) is also true, but without the change into an oxygen atmosphere there would have been no heterotrophs on the land to take advantage of eating plants as food.
2007-04-06 04:31:39 · answer #2 · answered by charmedchiclet 5 · 0⤊ 0⤋
I think your answer #4 is the best one. Pretty much all of the oxygen in the atmosphere is produced by photosynthesis. Before photosynthesis evolved, there was no free oxygen in the atmosphere at all. #2 isn't correct because photosynthesis doesn't produce water, but uses it to produce oxygen.
2007-04-06 04:28:07 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋
B?
No, the answer is 4. The production of oxygen was actually the first great environmental disaster the world faced. It also created the ozone layer, so reducing UV reaching the earth, which is thought to have been important in the creation of life in the first place.
2007-04-06 04:31:43 · answer #4 · answered by Anonymous · 0⤊ 0⤋