photosynthesis?

Question

Alright, so I know that light and chlorophyll are needed in photosynthesis I just don't know why exactly.

Answer 1

Photosynthesis occurs in two stages. In the first phase light-dependent reactions or photosynthetic reactions (also called the Light reactions) capture the energy of light and use it to make high-energy molecules. During the second phase, the light-independent reactions (also called the Calvin-Benson Cycle, and formerly known as the Dark Reactions) use the high-energy molecules to capture carbon dioxide (CO2) and make the precursors of glucose.

In the light-dependent reactions the pigment chlorophyll absorbs light and loses an electron that travels down an electron transport chain producing the high energy molecules NADPH and ATP. The chlorophyll molecule regains its electron by taking one from a water molecule through a process called photolysis, that releases oxygen gas as a byproduct.

In the Light-independent or dark reactions the enzyme RuBisCO captures CO2 from the atmosphere and in a complex process called the Calvin-Benson cycle releases 3-carbon sugars which are later combined to form glucose.

Photosynthesis may simply be defined as the conversion of light energy into chemical energy by living organisms. It is affected by its surroundings and the rate of photosynthesis is affected by the concentration of carbon dioxide, light intensity and the temperature.

Answer 2

Photosynthesis - the synthesis of sugar from light, carbon dioxide and water, with oxygen as a by-product. It is arguably the most important biochemical pathway known; nearly all life depends on it. It is an extremely complex process, comprised of many coordinated biochemical reactions. It occurs in higher plants, algae, some bacteria, and some protists, organisms collectively referred to as photoautotrophs. This article summarizes some of the major aspects of the process and provides links to more detailed articles explaining the numerous technical details, and implications, involved. Simple!

Answer 3

Light is used in the light reactions of photosynthesis called photosynthesis II and I. The light bumps of electrons creating a chain of events that lead to the creation of energy rich bonds that can be used towards other reactions needed to make sugars.

Answer 4

Photosynthesis (photo=light, synthesis=putting together), generally, is the synthesis of sugar from light, carbon dioxide and water, with oxygen as a waste product. It is arguably the most important biochemical pathway known; nearly all life depends on it. It is an extremely complex process, comprised of many coordinated biochemical reactions. It occurs in higher plants, algae, some bacteria, and some protists, organisms collectively referred to as photoautotrophs.

You could get more information from the link below...

Answer 5

Hi. The light is the source of energy and the process : http://www.answers.com/main/ntquery?s=Photosynthesis&gwp=16 causes the energy to be stored.

Answer 6

*Ahem* Plants produce Oxygen. We inhale Oxygen. We exhale CO2. Plants inhale CO2. CO2 and light activate the chlorophyll so that plants stay green. Chlorophyll is their food...when they run out in the fall they use a temporary food source, Carotene, and turn red/brown/orange, then die.