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Test: Photochemical Phase - NEET MCQ


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15 Questions MCQ Test Biology Class 11 - Test: Photochemical Phase

Test: Photochemical Phase for NEET 2024 is part of Biology Class 11 preparation. The Test: Photochemical Phase questions and answers have been prepared according to the NEET exam syllabus.The Test: Photochemical Phase MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Photochemical Phase below.
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Test: Photochemical Phase - Question 1

Which of the following is produced during the light phase of photosynthesis?

Detailed Solution for Test: Photochemical Phase - Question 1

Photochemical phase, also called light or Hill  reaction, occurs inside the thylakoids, especially those of grana region. Photochemical step is dependent upon light .The function of this phase is to produce assimilatory power consisting of reduced coenzyme NADPH and energy rich ATP molecules. 

Test: Photochemical Phase - Question 2

________ is the process of synthesis of ATP from ADP and Pi in the presence of light.

Detailed Solution for Test: Photochemical Phase - Question 2

The process by which ATP is sysnthesised by cells in mitochondria and chloroplasta is named as phosphorylation. Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate (Pi) in the presence of light, inside chloroplast. Photosphosphorylation is of two main types-Cyclic and non-cyclic photophosphorylation.

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Test: Photochemical Phase - Question 3

Photochemical phase does not include 

Detailed Solution for Test: Photochemical Phase - Question 3

The complete process of photosynthesis is studied under two phases-photochemical phae and biosynthetic phase. Photochemical phas involves absorpiton of light energy, photolysis of water with the release of O2 and production of assimiliatory power (i.e., ATP + NADPH). CO2 fixation occurs during biosynthetic phase photosynthesis.

Test: Photochemical Phase - Question 4

The reaction center for PS- I ______ and reaction center of PS- II is ______.

Detailed Solution for Test: Photochemical Phase - Question 4

The reaction centre of photosystem I (PS I) is referred to as P700 where "P" stands for "Pigment" and "700" stands for the wavelenght of light that this particular chlorophyll molecule absorbs most strongly. The reaction centre of photosystem II (PS II) is referred to as P680 for comparable reason.

Test: Photochemical Phase - Question 5

The biochemical objective of PS I is to 

Detailed Solution for Test: Photochemical Phase - Question 5

During Z- scheme, the electron extrucded by PS I passes through special chlorophyll X, Fe-S, ferredoxin, to finally reach NADP+,NADP+ is ultimately reduced by combining with H+ (released during photolysis) with the help of NADP+ reductase enzyme.

Test: Photochemical Phase - Question 6

Which one is involved in Z-scheme of photosynthesis?

Detailed Solution for Test: Photochemical Phase - Question 6

In non cyclic photophosphorylation, the whole scheme of transfer of electrons, starting from the PSII, uphill to the acceptor, down the electron transport chain to PSI, excitation of electrons, transfer to another acceptor, and finally down hill to NADP+ causing it to be reduced to NADPH + H+ is called as the Z scheme, due to its characteristic shape. This shape is formed when all the carriers are placed in a sequence on the redox potential scale.

Test: Photochemical Phase - Question 7

Read the following statement and select the correct ones.
(i) PS I is involved in non-cyclic photophosphorylation only. 
(ii) PS II is involved in both cyclic and non-cyclic  photophosphorylation.
(iii) Stroma lamellae membranes possess PS I only, whereas grana lamellae membranes possess both PS I and PS II. 

Detailed Solution for Test: Photochemical Phase - Question 7

PSI is involved in both cyclic and non-cyclic photophosphorylation PS II is involved only in non-cyclic photophosphorylation PS II is present in the aprressed (inner) part of grana thylakoids, PS I is located in the non-appressed (outer) part of grana thylakoids as well as stroma thylakoids

Test: Photochemical Phase - Question 8

Study given flow chart of cyclic photophosphorylation and select the correct answer for A, B and C.

Detailed Solution for Test: Photochemical Phase - Question 8

The given figure shows the light-harvesting complex of PS I the unidentified elements are as follows: A- PS I, B- electron acceptor, and C-P700

Test: Photochemical Phase - Question 9

Refer to the given reaction.
2H2​O → 4H+ + O​+ 4e
Where does this reaction take place in the chloroplasts of plants?

Detailed Solution for Test: Photochemical Phase - Question 9

The splitting of water is associated with the PSII, water is split into H+,[O] and electrons. The needed to replace those removed from photosystem I are provided by photosystem II.
2H2​O → 4H+ + O​+ 4e
Water splitting complex is associated with the PSII, which itself physically located on the inner side of the membrane of are thylakoid.

Test: Photochemical Phase - Question 10

Which one of the following is essential for the photolysis of water?

Detailed Solution for Test: Photochemical Phase - Question 10

The phenomenon of breaking up of water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis or photocatalytic splitting of water. It can be depicted as: 4H2​O ⇌ 4H+ + 4OH

Test: Photochemical Phase - Question 11

During non-cyclic photophosphorylation, electrons are continuously lost from the reaction centre of PSII. Which source is used to replace these electrons?

Detailed Solution for Test: Photochemical Phase - Question 11

Non-cydic photophosphorylation is the normal process of photophosphorylation in which the electron expelled by the excited photocentre does not return to it. Non- cydic photophosphorylation is carried out in collaboration of both photosystems I and II. Electron released during photolysis of H2O is picked up by photocentre of PSII called P680. The same is extruded out when the photocentre absorbs light energy (hv). Electrons released during the photolysis of water are immediately accepted by oxidised reaction centre of PSII (i.e., P680) through an unknown substance Z.

Test: Photochemical Phase - Question 12

Read the given statements and select the correct option. 
Statement 1 :
In photosynthesis, during ATP synthesis, protons accumulate in the lumen of thylakoid.
Statement 2 : In respiration, during ATP synthesis, protons accumulate in the intermembrane space of mitochondria.

Detailed Solution for Test: Photochemical Phase - Question 12

Chemiosmotic hypothesis for the synthesis of ATP was proposed by Peter Mitchell, 1961 (Nobel Prize in 1978). ATP synthesis is linked to the development of proton gradient across a membrane, which occurs in both photosynthesis is well as respiration.The difference between the two processes is that during photosynthesis, proton accumulation take place in the thylakoid lumen; whereas during respiration protons accumulate in the intermembranal space of mitochondria when electrons move through the ETS.

Test: Photochemical Phase - Question 13

Assume a thylakoid which is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

Detailed Solution for Test: Photochemical Phase - Question 13

If thylakoid is punctured, then the interior of the thylakoid is no longer separated from the stroma and this leads to stoppage of ATP synthesis.

Test: Photochemical Phase - Question 14

Identify the parts marked as A, B and C in the given figure showing ATP synthesis through chemiosmosis.

Detailed Solution for Test: Photochemical Phase - Question 14

Chemiosmosis is the movement of ions across a semipermeable membrane, down their electrochemical gradient.
A represents the thylakoid lumen, b-Fo & c-F1.

Test: Photochemical Phase - Question 15

In cyclic photophosphorylation, the electron released by reaction centre (P700) is ultimately accepted by

Detailed Solution for Test: Photochemical Phase - Question 15

In cyclic photophosphorylation, an electron expelled by the excited photocentre (P700) is returned to it after passing through a series of electron carriers. Its photocentre P700 extrudes an electron with a gain of 23kcal/mole of energy after absorbing a photon of light (hv). After losing the electron the photocentre becomes oxidised. The expelled electron passes through a series of carriers including X or A0 (a special P700 chlorophyll molecule), A1, (a quinone), FeS complexes (FeSx,FeSA,FeSB), ferredoxin (Fd), plastoquinone (PQ), cytochrome b−f complex and plastocyanin (PC) before returning to photocentre. While over the cytochrome complex, the electron energises passage of protons to create a proton gradient for synthesis of ATP form ADP and inorganic phosphate.

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