Question regarding light/dark reaction on Ap Cliffs

[ColumbiaOrtho]

For number 16, I thought the light reaction (photophosphorylation) occurs in the thylakoid membrane and the dark reaction (Calvin cycle)? Why is B false?

---

Members don't see this ad.

 

[mahveen]

In the light reaction, majority of photosynthesis takes place in the thylakoid membrane. HOWEVER, for the dark reaction, it takes place in the stroma of the chloroplast. So B is false because the DARK reaction/light INDEPENDENT REACTION takes place in the stroma, not the light reaction

 

[ColumbiaOrtho]

In the light reaction, majority of photosynthesis takes place in the thylakoid membrane. HOWEVER, for the dark reaction, it takes place in the stroma of the chloroplast. So B is false because the DARK reaction/light INDEPENDENT REACTION takes place in the stroma, not the light reaction

Yes, that is what I'm saying. However, the question is asking "All of the followings are TRUE about photosynthesis EXCEPT" choice A, indicating that all of the answer choices excetp A (including answer choice B) are true. My wording is a bit misleading so I will restate my question: Why isn't B the right answer for the question 16?

 

[Bingwen]

Please tell me if I'm wrong, but I believe that the reasoning behind this is because the stoma (the fluid within the inner membrane of the chloroplast) is where the dark reaction and calvin cycle takes place. The light reactions occur on the thykaloid membrane which is in the stoma (i.e. "stoma membranes"). The question is definitely worded a bit obscurely but the PS2 and PS1 are on they thykaloid membrane and are where the light reactions take place. A is definitely false because although the name implies that dark-reactions occur in the "dark" they actually form NADP+ which is needed in the light reaction for the reaction after the electron reaches PS1.

Right but I think they are asking why is A true. Which I am not sure because I think most of the light is on the thykaloid membrane not the stroma. I am going to guess that is a typo.

 

[Bingwen]

It states that A isn't true.

Haha silly me I meant B.