Question #59b92

1 Answer
Dec 11, 2017

Yes, dark reaction can take place in absence or presence of light provided ATP and NADPH(products of light reaction).
But both reactions can't take place simultaneously.

Explanation:

The basic requirements of dark reactions is energy(ATP and NADPH) which is provided by light reactions of photosynthesis. If this energy is supplied then dark reaction will occur, no matter light is provided or not.

And both processes can't take place simultaneously because first the light reactions will occur and will produce assimilatory power in the form of ATP and NADPH. Then their energy would be used in dark reactions to produce sugars(carbohydrates) in the stroma of chloroplast.
Equation for dark reaction:

#3CO_2 + 6NADPH + 9ATP to (CH_2O)_3 + 6NADP + 9ADP +"9Pi"#
http://www2.sluh.org/bioweb/bi100/tutorials/photosynthesis.htm

Hope it helps...