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CBSE Class 10 Answered

Photosynthesis convert chemical energy into light energy explain
Asked by vijayakhatri44 | 17 May, 2019, 09:22: PM
answered-by-expert Expert Answer
The process of photosynthesis in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce organic compounds and oxygen. There are two main sets of reactions: energy-transduction reactions (commonly called light reactions) and carbon-fixation reactions (commonly called dark reactions).
 
In simple steps,
 
Three major events occur in plant cells during photosynthesis:
(1) absorption of light energy,
(2) conversion of light energy into chemical energy, and
(3) storage of chemical energy in sugars. 

Photosynthesis is a two stage process.

The first process is the Light Dependent Process (Light Reactions), requires the direct energy of light to make energy carrier molecules that are used in the second process. The Light Independent Process (or Dark Reactions or Calvin Cycle) occurs when the products of the Light Reaction are used to form C-C covalent bonds of carbohydrates. The Dark Reactions can usually occur in the dark, if the energy carriers from the light process are present. Recent evidence suggests that a major enzyme of the Dark Reaction is indirectly stimulated by light, thus the term Dark Reaction is somewhat of a misnomer. The Light Reactions occur in the grana and the Dark Reactions take place in the stroma of the chloroplasts.

 In the Light Dependent Processes light strikes chlorophyll a in such a way as to excite electrons to a higher energy state. In a series of reactions the energy is converted (along an electron transport process) into ATP and NADPH. Water is split in the process, releasing oxygen as a by-product of the reaction. The ATP and NADPH are used to make C-C bonds in the Light Independent Process. 

Answered by Sivanand Patnaik | 18 May, 2019, 12:39: PM
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