Question

Choose the correct option:
A. Stroma lamellae membrane lacks PSII and PS I.
B. When PS I is functional, electrons flow in a noncyclic way.
C. ATPase enzymes consist of Fo and F1 units.
D. NADP reductase is a part of PS II.

Answer 1

Photosynthesis is the process in which plants and some organisms convert light energy into chemical energy. These types of organisms are also known as autotrophs because they can produce their own food and are not dependent on any other organisms.

Complete answer:
Photosynthesis is the process in which plants and some organisms convert light energy into chemical energy. This process is divided into two parts: Light reaction (light dependent reaction) and Dark reaction (light independent reaction).
Option A is incorrect because, stroma lamellae membrane has PS I but lacks PS II. Stroma lamellae also lacks NADP reductase enzyme and also PS II but it has PS I. PS I and PS II are also known as photosystem I and photosystem II. These are the multi protein complexes which contain the pigment necessary to harvest photons. It also acts as a catalyst of primary photosynthetic reactions. Hence, option A is incorrect.
Option B is incorrect because, when photosystem I is functional, electrons start flowing in a cyclic way. In cyclic phosphorylation high energy electrons flow in the cyclic pathway. In this process the flow of electrons begins in photosystem I and then it goes to primary acceptor ferredoxin and then to plastoquinone and then to cytochrome b6f before returning to photosystem I. hence it is a cyclic process
Option C is correct because ATPase enzyme has both Fo and F1 units which allow for the production of ATP. ATP synthase is an enzyme which catalyzes the formation of adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and an inorganic phosphate.
Option D is incorrect because NADP Reductase is a part of photosystem I not of photosystem II. NADP reductase is the last enzyme in the transfer of electrons in photosynthesis from photosystem I to NADPH.
In the reaction of the calvin cycle, NADPH is used as a reducing agent.

Hence, option C is the correct answer.

Note:
Photosynthesis is the process in which plants and some organisms convert light energy into chemical energy.This process is divided into two parts: Light reaction (light dependent reaction) and Dark reaction (light independent reaction). ATPase has both Fo and F1 units hence option C is correct.