NEET
2026
MCQ
Find the incorrect statement(s) about photosynthesis from the following:
A. The water splitting complex is associated with PSI.
B. $\mathrm{C}_4$ plants use the $\mathrm{C}_3$ pathway of $\mathrm{CO}_2$ fixation as the main biosynthetic pathway.
C. In $\mathrm{C}_4$ plants, photorespiration does not occur.
D. $\mathrm{C}_3$ plants exhibit 'Kranz' anatomy.
E. ATP synthesis in chloroplast occurs through chemiosmosis.
Choose the answer from the options given below:
NEET
2026
MCQ
The enzyme required for carboxylation in the Calvin cycle is
NEET
2026
MCQ
How many ATP and NADPH molecules are required to make one molecule of glucose through the Calvin pathway?
NEET
2026
MCQ
How many turns of Calvin cycle are required for the formation of three molecules of glucose?
NEET
2026
MCQ
Photorespiration reaction catalyzed by RuBisCo is shown below:
$\mathrm{RuBP}+\mathrm{O}_2 \rightarrow$ 3-Phosphoglycerate +X . Identify " X " from the given options:
NEET
2026
MCQ
Which pigment has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P700)?
NEET
2026
MCQ
Which of the following statements regarding photorespiration are correct?
(a) Do not occur in C 3 plants
(b) $\quad \mathrm{CO}_2$ is consumed and $\mathrm{O}_2$ is generated
(c) Phosphoglycolate is formed
(d) No synthesis of ATP and NADPH
Choose the correct answer from the options given below:
NEET
2026
MCQ
Select the correct sequence of experiments that led to a gradual understanding of photosynthesis in green plants.
NEET
2025
MCQ
Which of the following statements about RuBisCO is true?
NEET
2025
MCQ
Match List-I with List-II
|
List - I
|
|
List - II
|
| A |
Chlorophyll a |
I |
Yellow-green |
| B |
Chlorophyll b |
II |
Yellow |
| C |
Xanthophylls |
III |
Blue-green |
| D |
Carotenoids |
IV |
Yellow to Yellow-orange |
Choose the option with all correct matches.
NEET
2024
MCQ
Which of the following are required for the light reaction of Photosynthesis?
A. $\mathrm{CO}_2$
B. $\mathrm{O}_2$
C. $\mathrm{H}_2 \mathrm{O}$
D. Chlorophyll
E. Light
Choose the correct answer from the options given below:
NEET
2024
MCQ
Which one of the following products diffuses out of the chloroplast during photosynthesis?
NEET
2024
MCQ
Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option.

NEET
2024
MCQ
How many molecules of ATP and NADPH are required for every molecule of $\mathrm{CO}_2$ fixed in the Calvin cycle?
NEET
2024
MCQ
Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. $\mathrm{CO}_2$
D. ATP
E. NADPH
Choose the correct answer from the options given below:
NEET
2024
MCQ
Given below are two statements:
Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to $\mathrm{RuBisCO}$, hence $\mathrm{CO}_2$ fixation is decreased.
Statement II: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:
NEET
2023
MCQ
Match List - I with List - II.
|
List - I |
|
List - II |
| (A) |
Chlorophyll a |
(I) |
Yellow to yellow orange |
| (B) |
Chlorophyll b |
(II) |
Yellow green |
| (C) |
Xanthophyll |
(III) |
Blue green |
| (D) |
Carotenoid |
(IV) |
Yellow |
Choose the correct answer from the options given below :
NEET
2023
MCQ
Given below are two statements :
Statement I : RuBisCO is the most abundant enzyme in the world.
Statement II : Photorespiration does not occur in C$_4$ plants.
In the light of the above statements, choose the most appropriate answer from the options given below :
NEET
2023
MCQ
Which out of the following statements is incorrect?
NEET
2023
MCQ
How many ATP and NADPH2 are required for the synthesis of one molecule of Glucose during Calvin cycle?
NEET
2023
MCQ
The reaction centre in PS II has an absorption maxima at
NEET
2022
MCQ
When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?
NEET
2022
MCQ
Identify the correct statements regarding chemiosmotic hypothesis:
(a) Splitting of the water molecule takes place on the inner side of the membrane.
(b) Protons accumulate within the lumen of the thylakoids.
(c) Primary acceptor of electron transfers the electrons to an electron carrier.
(d) NADP reductase enzyme is located on the stroma side of the membrane.
(e) Protons increase in number in stroma.
Choose the correct answer from the options given below:
NEET
2022
MCQ
Given below are two statements:
Statement I : The primary CO2 acceptor in C4 plants is phosphoenolpyruvate and is found in the mesophyll cells.
Statement II : Mesophyll cells of C4 plants lack RuBisCo enzyme.
In the light of the above statements, choose the correct answer from the options given below:
NEET
2022
MCQ
Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:
NEET
2021
MCQ
The first stable product of CO2 fixation in Sorghum is
NEET
2021
MCQ
Which of the following statements is incorrect?
NEET
2020
MCQ
In light reaction, plastoquinone facilitates the
transfer of electrons from
NEET
2020
MCQ
The oxygenation activity of RuBisCo enzyme
in photorespiration leads to the formation of
NEET
2018
MCQ
Which of the following is not a product of light
reaction of photosynthesis?
NEET
2017
MCQ
Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in
NEET
2017
MCQ
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
NEET
2016
MCQ
The process which makes major difference between C3 and C4 plants is
NEET
2016
MCQ
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options.
NEET
2016
MCQ
In a chloroplast the highest number of protons are found in
NEET
2016
MCQ
Emerson's enhancement effect and Red drop have been instrumental in the discovery of
NEET
2016
MCQ
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?
NEET
2016
MCQ
Water soluble pigments found in plant cell vacuoles are
NEET
2015
MCQ
In photosynthesis, the light-independent reactions take place at
NEET
2015
MCQ
Chromatophores take part in
NEET
2012
MCQ
Read the following four statements (A $-$ D). phosphorylation involve uphill transport of protons across the membrane.
(A) Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.
(D) Symbiotic nitrogen fixers occur in free-living state also in soil.
How many of the above statements are right?
NEET
2012
MCQ
A process that makes important difference between C3 and C4 plants is
NEET
2012
MCQ
The correct sequence of cell organelles during photores piration is
NEET
2011
MCQ
In kranz anatomy, the bundle sheath cells have
NEET
2011
MCQ
Which one of the following is essential for
photolysis of water?
NEET
2011
MCQ
CAM helps the plants in
NEET
2010
MCQ
Study the pathway given below:

In which of the following options correct words
for all the three blanks A, B and C are indicated?
NEET
2010
MCQ
Read the following four statements, (i), (ii), (iii) and (iv) and select the right opening having both correct statement.
Statements :
(i) Z scheme of light reaction takes place in presence of PSI only.
(ii) Only PSI is functional in cyclic photophosphorylation.
(iii) Cyclic photophosphorylation results into synthesis of ATP and NADPH2.
(iv) Stroma lamellae lack PSII as well as NADP.
NEET
2010
MCQ
Kranz anatomy is one of the characteristics of the leaves of
NEET
2010
MCQ
C4 plants are more efficient in photosynthesis than C3 plants due to
NEET
2010
MCQ
PGA as the first CO2 fixation product was discovered in photosynthesis of
NEET
2009
MCQ
Stroma in the chloroplasts of higher plant contains
NEET
2009
MCQ
Cyclic photophosphorylation results in the formation of
NEET
2008
MCQ
The C4 plants are photosynthetically more efficient than C3 plants because
NEET
2008
MCQ
In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in
NEET
2008
MCQ
Electrons from excited chlorophyll molecule of photosystem II are accepted first by
NEET
2007
MCQ
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of
NEET
2007
MCQ
The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is
NEET
2006
MCQ
In photosystem I, the first electron acceptor is
NEET
2006
MCQ
During photorespiration, the oxygen consuming reaction(s) occur in
NEET
2005
MCQ
As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants?
NEET
2005
MCQ
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
NEET
2005
MCQ
Photosynthetic Active Radiation (PAR) has the following range of wavelengths.
NEET
2004
MCQ
Plants adapted to low light intensity have
NEET
2004
MCQ
In C3 plants, the first stable product of photosynthesis during the dark reaction is
NEET
2003
MCQ
Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
NEET
2003
MCQ
Stomata of CAM plants
NEET
2003
MCQ
Which one of the following concerns photophosphorylation?
NEET
2003
MCQ
Which one of the following is wrong in relation to photorespiration?
NEET
2003
MCQ
Which element is located at the centre of the porphyrin ring in chlorophyll?
NEET
2003
MCQ
In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is
NEET
2002
MCQ
In photosynthersis energy from light reaction to dark reaction is transferred in the form of
NEET
2002
MCQ
Which pigment absorbs the red and far-red light?
NEET
2002
MCQ
Which of the following absorb light energy for photosynthesis?
NEET
2001
MCQ
What is true for photolithotrophs?
NEET
2001
MCQ
Which pigment system is inactivated in red drop?
NEET
2001
MCQ
Which pair is wrong?
NEET
2000
MCQ
Which is the first CO2 acceptor enzyme in C4 plants?
NEET
2000
MCQ
For the synthesis of one glucose molecule the Calvin cycle operates for
NEET
2000
MCQ
The first step for initiation of photosynthesis will be
NEET
2000
MCQ
For assimilation of one CO2 molecule, the enerrgy required in from of ATP and NADPH2 are