Light-dependent and light-independent reactions occur at the same time. True or False

8 answers
Question:

Light-dependent and light-independent reactions occur at the same time. True or False

Answers

true  because they are driven by the ATP made by the light-dependent reactions. Both systems shut down in the dark. The light-independent reactions can last a little longer if there is ATP remaining in the chloroplast.

A) Both reactions rely on chemical energy.

Explanation:

The light-dependent phase of photosynthesis occurs in the chloroplasts' tilacoid membrane, the capture of light energy and the transformation into chemical energy. In this process, the green pigment molecules go into an excited state, emitting part of the absorbed energy. These pigments are organized into two photosystems (I and II), which can be defined as light capture units present in thylacoids.

In this phase, light energy is absorbed by pigments in photosystem II and transferred to chlorophyll molecules in the reaction center. The energized electrons are transferred to an electron receiver. According to the transfer of these electrons, they are replaced by others from water photolysis. Here, too, oxygen is produced.

Some pairs of electrons pass to photosystem I stimulating ATP synthesis. The energy absorbed at that moment stimulates the chlorophyll molecules of the reaction center of this photosystem, and the energized electrons are accepted by a NADP + molecule. The electrons removed from chlorophyll are replaced by others from photosystem II.

The independent light phase occurs in the chloroplast stroma and also depends on the chemical energy. It starts with the process of fixing carbon in an organic compound. In this stage, the molecules of NADPH and ATP produced in the light phase are used for the production of sugars from the reduction of the fixed carbon. The reactions that occur here are called Calvin Cycle and, in the process, most of the fixed carbon is converted into sucrose or starch.

D: The light-dependent reactions produce ATP and NADPH; the light-independent reactions use energy stored in ATP and NADPH.

Explanation:

Photosynthesis is a biological process during which green plants synthesize glucose using inorganic raw materials such as water and carbon dioxide. It is a reaction that takes place in an organelle known as chloroplast, and it consists of 2 reactions;

the light dependent reaction during which light energy is used to split molecules of water and the resulting electron is used to synthesize ATP and NADPHthe light independent reaction during which the ATP and NADPH produced in light dependent reaction is used to fix carbon dioxide into glucose.

While the light dependent reaction cannot proceed without light availability, the light independent reaction can proceed both in the presence or absence of light.

Hence, the correct option is D.

D

They occur in the thylakoid membranes of the chloroplast.

INCORRECT: *the light reactions take place in the cytoplasm and the light-independent reactions occur in the chloroplast

*The light-dependent ("light reaction") reactions occur in the Grana (look like a stack of green coins or coils) of the chloroplast.


[tex]Which is incorrect about photosynthesis? the light reactions take place in the cytoplasm and the li[/tex]

to convert light energy into the chemical energy of ATP and NADPH

Explanation:

Out of the following choices, if chlorophyll is removed from the the chloroplast in a plant cell, the light dependent reactions will cease but the light independent reactions will be able to continue. 

Providing energy when light is unavailable

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