Photosystem-II takes place inA: stromaB: granaC: entire chloroplastD: chloroplast membraneCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

PS II occurs mostly on the granal lamellae of the chloroplast. PS II uses light energy for photolysis of H2O molecules, or oxidizing H2O molecules producing electrons, protons (H+) and O2.

Answer

Photosytem 2 is present on the appressed part of granal thylakoid..so option A

Answer

Ans should be A

Answer

Stroma commonly refers to the fluid filled inner space of chloroplasts surrounding thylakoids and grana.  stroma could also refer to other supporting structures such as the connective tissues in organs or the fungal tissue that carries spores.

Answer

A

Answer

Option A

Answer

Photosystem-II takes place in Grana

Photosystem-II (PSII) is a process that occurs in the thylakoid membrane of the chloroplast, specifically in the grana. The grana are the stacks of thylakoid membranes found in the chloroplasts of plant cells. They are responsible for capturing light energy and converting it into chemical energy during the process of photosynthesis.

Explanation:
The process of photosynthesis occurs in the chloroplasts of plant cells. Chloroplasts contain two types of photosystems, namely Photosystem-I (PSI) and Photosystem-II (PSII). These photosystems are embedded in the thylakoid membrane, which is part of the chloroplast structure.

1. Chloroplast Structure:
- Chloroplasts are double-membrane organelles found in the cells of green plants.
- The inner membrane encloses a fluid-filled space called the stroma.
- The stroma contains enzymes and other molecules necessary for the synthesis of glucose during the Calvin cycle.
- The stroma is also the location of the second stage of photosynthesis, known as the light-independent reactions or the Calvin cycle.

2. Thylakoid Membrane and Grana:
- The thylakoid membrane is a network of interconnected sac-like structures called thylakoids.
- The thylakoid membrane contains chlorophyll and other pigments that absorb light energy.
- The thylakoids are organized into stacks called grana, which are connected by intergranal lamellae.
- The grana provide a large surface area for the capture of light energy and the production of ATP and NADPH.

3. Photosystem-II (PSII):
- PSII is the first photosystem in the light-dependent reactions of photosynthesis.
- It is responsible for capturing light energy and transferring it to other molecules involved in the electron transport chain.
- PSII is located in the thylakoid membrane, specifically in the grana.
- The light energy absorbed by PSII is used to split water molecules, releasing oxygen and generating ATP through photophosphorylation.

In conclusion, Photosystem-II takes place in the grana, which are stacks of thylakoid membranes found in the chloroplasts of plant cells. The grana provide an organized structure for the efficient capture of light energy and the production of ATP and NADPH during photosynthesis.

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