Tag: modern concept of photosynthesis

Questions Related to modern concept of photosynthesis

Electron Transport System (ETS) is located in mitochondrial
botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. Outer membrane

  2. Inter membrane space

  3. Inner membrane

  4. Matrix

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Correct Option: C
Explanation:

An electron transport system (ETS) or electron transport chain (ETC) is a series of coenzymes and cytochromes that take part in the passage of electrons from one carrier to another and to its ultimate acceptor. The various components of ETS are arranged in five kinds of complexes, arranged in a definite sequence in the inner mitochondrial membrane.

So the correct option is C.

Cyclic photophosphorylation takes place in the thylakoid which lacks:

botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. Electron transport system

  2. Enzyme FNR(ferredoxin NADP reductase )

  3. Lumen

  4. Photosystem with absorption peak $700nm$

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Correct Option: A
Explanation:

Cyclic Photophosphorylation is the process, in which systems (like prokaryotes), just accomplishes the ADP to ATP for immediate energy for the cells. This type of photophosphorylation usually occurs in the thylakoid membrane. So the correct option is ' Electron transport system'.

Consider the following events in the photochemical conversion of light energy into chemical energy by chlorophyll during photosynthesis.
a. Charge separation
b. Absorption of a quantum of energy
c. Ejection of electron
d. Transfer of light energy
The correct sequence of these events is?

botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. $4, 2, 1, 3$

  2. $4, 2, 3, 1$

  3. $2, 4, 1, 3$

  4. $2, 4, 3, 1$

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Correct Option: A
Which range of wavelength (in nm) is called photosynthetically active radiation (PAR)? 
botany photosynthesis electron transport system modern concept of photosynthesis photosynthesis in higher plants

  1. 100-390

  2. 390-430

  3. 400-700

  4. 760-10,000

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Correct Option: C
Explanation:

Sunlight or solar radiations reaching the earth have wavelength between 300 nm (in the ultra volt rang) to 2600 nm (in the infa-red range). Part of the spectrum used in photosynthesis has a wavelength between 400-700 nm, it is called as photo synthetically active radiation (PAR). 

Oxygen released in photosynthesis is due to 

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. Photophosphorylation.

  2. Photolysis of water.

  3. Photorespiration.

  4. Photons.

Show answer
Correct Option: B
Explanation:
Photosynthesis is a process which occurs in two stages. The first is the light dependent reaction where the captured energy of light is used to make the ATP and NADPH. The second stage is where the reactions independent of light use these products to capture and reduce carbon dioxide. Photolysis is part of the light dependent reaction of the photosynthesis process.  
Photosynthesis photolysis can be represented as H$ _2$A + 2 photons --> 2 e$^-$ + 2H$^+$ + A, where the chemical nature of the 'A' depends on the organism. The experiments conducted by Samuel Ruben and Martin Kamen by using radioactive isotopes helped to prove that the oxygen liberated during photosynthesis came from photolysis the water.
Thus, the correct answer is option B.

During photosynthesis, oxygen is evolved from

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. $H _{2}S$.

  2. $H _{2}O$.

  3. $CO _{2}$.

  4. $HCO _{3}$.

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Correct Option: B
Explanation:

Photosynthesis is a redox reaction in which carbon dioxide is reduced to sugars and water is oxidised to release oxygen.

Photolysis refers to light dependent split of water molecule, which occurs during photosynthesis. The process of photolysis provides electrons for non cyclic electron flow during non cyclic photophosphorylation. Mineral ions required for the process of photolysis are manganese, calcium and chlorine.

In the process of photosynthesis, the water molecule is broken down in

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. Red drop.

  2. Photolysis.

  3. Phoshorylation.

  4. Carbon assimilation.

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Correct Option: B
Explanation:

Photosynthesis is chemically a redox reaction in which carbon dioxide is reduced and water is oxidised. During light reaction phase of photosynthesis, the electron that has been donated to the electron transport chain is replaced through photolysis (light dependent splitting) of water, a process that not only yields electrons but also is the source of almost all the oxygen in Earths atmosphere. 

Photolysis of water releases ........... gas.

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. ${ CO } _{ 2 }$

  2. ${ O } _{ 2 }$

  3. ${ NH } _{ 3 }$

  4. ${ CH } _{ 3 }$

Show answer
Correct Option: B
Explanation:

Photolysis, the chemical process by which molecules are broken down into smaller units through the absorption of light.

Photolysis of water is the process by which water is split into H+, oxygen, and electrons in the presence of light.
So the answer is 'O2'. 

Splitting of water is associated with 

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. Photosystem I

  2. Lumpen of thylakoid 

  3. Both photosystem I and II

  4. Inner surface of thylakoid membrane.

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Correct Option: D
Explanation:

Light reaction occur inside the thylakoids, especially those of grana region. It involves two types of reaction photosynthesis of water and production of assimilation power.  The phenomenon of breaking up of water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis or photocatalytic , splitting of water, Water splitting complex is associated with the PSII, which itself is physically located on the inner surface of thylakoid  membrane. 
$4H _{2} O \rightleftharpoons 4H^{+} + 4OH^-$
$ 4OH^- \xrightarrow[Mn^{2+}, Ca^{2+}, Cl^-]{Oxygen \,\,evolving\,\, complex} 2H _{2} + O _{2}\uparrow + 4e^- $ , So, the correct answer is 'inner surface of thylakoid membrane.'.

Splitting of water in photosynthesis is called as

botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

  1. Dark reaction

  2. Electron transfer

  3. Photolysis

  4. Phototropism

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Correct Option: C