Tag: modern concept of photosynthesis

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Questions Related to modern concept of photosynthesis

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

  1. Outer membrane

  2. Inter membrane space

  3. Inner membrane

  4. Matrix
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Cyclic photophosphorylation takes place in the thylakoid which lacks:

  1. Electron transport system

  2. Enzyme FNR(ferredoxin NADP reductase )

  3. Lumen
  4. Photosystem with absorption peak $700nm$
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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?

  1. $4, 2, 1, 3$
  2. $4, 2, 3, 1$
  3. $2, 4, 1, 3$
  4. $2, 4, 3, 1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct sequence is: 1. Absorption of light energy (2), 2. Transfer of light energy (4), 3. Charge separation (1), 4. Ejection of electron (3).

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

  1. 100-390

  2. 390-430

  3. 400-700

  4. 760-10,000
Reveal answer Fill a bubble to check yourself
C Correct answer
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). 

Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

Oxygen released in photosynthesis is due to 

  1. Photophosphorylation.

  2. Photolysis of water.

  3. Photorespiration.

  4. Photons.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

During photosynthesis, oxygen is evolved from

  1. $H _{2}S$.
  2. $H _{2}O$.
  3. $CO _{2}$.
  4. $HCO _{3}$.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

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

  1. Red drop.

  2. Photolysis.

  3. Phoshorylation.

  4. Carbon assimilation.
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

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

  1. ${ CO } _{ 2 }$
  2. ${ O } _{ 2 }$
  3. ${ NH } _{ 3 }$
  4. ${ CH } _{ 3 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
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'. 

Multiple choice botany photosynthesis modern concept of photosynthesis photosystems photosynthesis in higher plants

Splitting of water is associated with 

  1. Photosystem I

  2. Lumpen of thylakoid

  3. Both photosystem I and II

  4. Inner surface of thylakoid membrane.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.'.