What would happen to the concentrations of ATP, NADPH and Sugars if PSII stopped working? Decrease

Stay the Same

Increase

ATP

NADPH

Sugars

Which of the following is true about the Calvin cycle?

Rubisco fixes O2 to a carbohydrate molecule.

Both ATP and NADPH are needed to make sugars.

Light energy is converted to chemical energy.

1. ATP - decrease

2.NADPH - decrease

3. sugars - decrease

And    True- Both ATP and NADPH are needed to make sugars.

Explanation:

Photosynthesis is a form of biosynthesis that produces glucose from the reactants;  it uses energy from sunlight, along with carbon dioxide and water. It happens in the chloroplast in two phases; the light-dependent and dark reactions. In the light reaction, solar energy stimulates photosystems, formed from pigments like chlorophylls.

Chlorophyll forms photosystems of proteins known as complex proteins (PS I & PSII).  PS II absorbs and moves the reaction center with light energy.  

H+, and oxygen,  are formed from a water molecule as it's broken apart. From photosystem II, electrons are transferred to photosystem I.  ATP is synthesized from ADP along with inorganic phosphate.  To form NADPHH, H+ is added to NADP

If PS II no longer works,  there will be less ATP, NADPH, (both used later on) and no sugars produced.

In the dark reaction, products of the light reaction are used to make sugars. Here, in the Calvin cycle, the enzyme, RuBisCO, catalyzes the fixation of CO2 with Ribulose 1,5-bisphosphate (RuBP).

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