Question

Light Dependent reactions:

What is photolysis? What is broken down, and what gets generated?

f. What do the two electron transport chains generate?

g. How does cyclic differ from linear electron flow?

h. Where in the chloroplast is the H+ concentration highest

Answer 1

Light Dependent reactions:

What is photolysis? What is broken down, and what gets generated?

Photolysis is a chemical reaction in which an inorganic chemical or an organic chemical is broken down by photons and is the interaction of one or more photons with one target molecule. Photolysis is also called photodissociation and photodecomposition

For example, the photolysis of water molecule is occurred in photosynthesis under the influence of light. During photolysis when photons are absorbed, it causes the hydrogen to bind to an acceptor, subsequently releasing the oxygen.

What do the two electron transport chains generate?

The light-dependent reactions use light energy to make two molecules: the energy storage molecule ATP and the reduced electron carrier NADPH. These two molecules are needed for the next stage of photosynthesis.

During photosynthesis, one electron transport chain provides energy that use to make ATP, while the other provides energy to make NADPH.

How does cyclic differ from linear electron flow?

There are two types of photosystems involved in the light-dependent reactions that are photosystem II (PSII) and photosystem I (PSI). The pathway that involves these two photosystems is sometimes called linear photophosphorylation. It is named so because electrons travel in a line from water through PSII and PSI to NADPH. In linear photophosphorylation both ATP and NADPH are produced.

In cyclic photophosphorylation , electrons break this pattern and instead of travelling in a line they loop back to the first part of the electron transport chain, repeatedly cycling through PSI instead of ending up in NADPH. In cyclic photophosphorylation only ATP (no NADPH) is produced.

Where in the chloroplast is the H+ concentration highest?

In inner thylakoid space in chloroplast the H+ concentration is highest.