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NEET • BIOLOGY • PHOTOSYNTHESIS IN HIGHER PLANTS

Photosynthesis in higher plants practice · Mixed difficulty

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Showing 1-30 of 194 questions

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1 Hard
1 of 194
Understanding +4 | -1
Energy required for ATP synthesis in PS – II comes from?
View answer and explanation
Correct option: A
Proton gradient
Option A (Proton gradient) is correct because the energy required for ATP synthesis in PS-II (and generally in chloroplasts) comes from the proton gradient established across the thylakoid membrane.
2 Easy
2 of 194
Understanding +4 | -1
Correct sequence of rate of photosynthesis in different light is
View answer and explanation
Correct option: A
Red > Blue > Green
Option A is correct because red light is more effectively absorbed by chlorophyll than blue light, and green light is poorly absorbed.
3 Hard
3 of 194
Understanding +4 | -1
The C4{C_4} plants are photosynthetically more efficient than C3{C_3} plants because:
View answer and explanation
Correct option: B
CO2C{O_2} generated during photorespiration is trapped and recycled through PEP carboxylase
Option B is correct because C4{C_4} plants recycle CO2C{O_2} from photorespiration, concentrating it around RuBisCO and minimizing wasteful oxygenation.
4 Medium
4 of 194
Understanding +4 | -1
If a chemical process is affected by more than one factors then its rate will be determined by
View answer and explanation
Correct option: B
Only one factor, which is close to its minimal value
Option B (Only one factor, which is close to its minimal value) is correct because, according to Blackman's Law of Limiting Factors, the rate of a process is limited by the factor that is closest to its minimum value.
5 Hard
5 of 194
Analyzing +4 | -1
Identify the incorrect statements among the following

I. When only PS I is functional, cyclic flow of electrons is not possible

II. The breakdown of the gradient provides enough to make the enzyme synthesis

III. The NADP reductase enzyme is located of the thylakoid membrane

IV. Proton gradient increases due to PC\mathrm{PC} and Cyt ff.
View answer and explanation
Correct option: B
I, III, IV
Option A (I, II, III) is correct because statements I, II, and III are incorrect regarding cyclic electron flow, gradient breakdown, and NADP reductase location.
6 Easy
6 of 194
Remembering +4 | -1
Law of limiting factors was given by
View answer and explanation
Correct option: B
Blackman
Option B (Blackman) is correct because Blackman is known for giving the Law of Limiting Factors.
7 Medium
7 of 194
Remembering +4 | -1
PS-I is located on the
View answer and explanation
Correct option: D
Both (a) and (b)
Option D (Both (a) and (b)) is correct because PS-I is located on the non-appressed part of grana thylakoids and stroma thylakoids.
8 Medium
8 of 194
Remembering +4 | -1
I. Chlorophyll-a II. Chlorophyll-b III. Anthocyanin Select the correct option regarding water soluble pigment
View answer and explanation
Correct option: B
Only III
Option B (Only III) is correct because anthocyanins are water-soluble pigments, while chlorophylls are fat-soluble.
9 Medium
9 of 194
Understanding +4 | -1
In which of the following, oxygen does not evolve during photosynthesis?
View answer and explanation
Correct option: D
Photosynthesis bacteria
Option D is correct because photosynthetic bacteria often use other compounds like hydrogen sulfide instead of water, so they don't release oxygen.
10 Hard
10 of 194
Analyzing +4 | -1
The ratio between 2-carbon and 3-carbon intermediates having –NH2– NH_2 group formed in photosynthetic oxidation cycle is
View answer and explanation
Correct option: B
2:12:1
Option B (2:1) is correct because in the photorespiratory pathway, two molecules of glycine (2-C) are converted to one molecule of serine (3-C). Both glycine and serine contain an -NH2 group.
11 Hard
11 of 194
Understanding +4 | -1
Assertion (A): C4\mathrm{C}_4 plants can tolerate high temperature conditions.

Reason (R): Enzyme pepcase and PPDK work only on high temperature.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because C4 plants can tolerate high temperatures due to the enzymes PEPcase and PPDK functioning optimally at higher temperatures.
12 Hard
12 of 194
Application +4 | -1
How many ATP and NADPH2NADPH_2 are required for production of two sucrose molecules in sugarcane?
View answer and explanation
Correct option: B
120 ATP, 48 NADPH2NADPH_2
Option B (120 ATP, 48 NADPH2NADPH_2) is correct because each sucrose molecule requires 60 ATP and 24 NADPH2, and two sucrose molecules would require double that amount.
13 Easy
13 of 194
Understanding +4 | -1
A student sets up an experiment on photosynthesis as follow : He takes soda water in a glass tumbler and add a chlorophyll extracts into the contents and keeps the tumbler exposed sunlight hoping that he has provided necessary ingredient for photosynthesis to proceed (viz, CO2C{O_2} , H2O{H_2}O , chlorophyll and light).
What do you think what will happen after, say few hours of exposure of light?
View answer and explanation
Correct option: D
Photosynthesis will not take place because intact chloroplasts are needed for the process
Option D is correct because photosynthesis requires intact chloroplasts to function properly, which are not present in the student's setup.
14 Hard
14 of 194
Understanding +4 | -1
Assertion (A): C3\mathrm{C}_3 plants do not show rise is photosynthesis at higher temperature.

Reason (R): Enzymes of C3\mathrm{C}_3 plants are high temperature sensitive as compared to low temperature sensitive enzymes of C4\mathrm{C}_4 plants.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because C3 plants are more sensitive to high temperatures due to their enzymes being less stable at higher temperatures compared to C4 plants.
15 Medium
15 of 194
Analyzing +4 | -1
In half leaf experiment, a part of a leaf is enclosed in a test tube containing KOH soaked cotton, while the other half is exposed to air and then setup is placed in light for sometime. It was latter found that part of leaf which was exposed to air tested positive for starch. This indicates that
View answer and explanation
Correct option: D
Carbon dioxide is essential for photosynthesis because in KOH soaked leaf, starch synthesis do not occurs as CO2C{O_2} is absorbed by, so CO2C{O_2} is not available for photosynthesis
Option D is correct because KOH absorbs carbon dioxide, preventing it from being available for photosynthesis in the enclosed part of the leaf.

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16 Medium
16 of 194
Understanding +4 | -1
Plants in which the first product of CO2C{O_2} fixation is C3{C_3} acid, i.e., the …A… pathway, and those in which the first product was C4{C_4} acid (OAA), i.e., the …B… pathway Complete the given statement by filling appropriate options in the given blanks
View answer and explanation
Correct option: B
A−C3;B−C4A - {C_3};B - {C_4}
Option B (A−C3;B−C4A - {C_3};B - {C_4}) is correct because plants with the C3C_3 pathway have C3C_3 acid as the first product, and plants with the C4C_4 pathway have C4C_4 acid as the first product.
17 Hard
17 of 194
Analyzing +4 | -1
Find out the incorrect statement from the following.
View answer and explanation
Correct option: D
There is no division of labour in chloroplast
Option D (There is no division of labour in chloroplast) is correct because chloroplasts have a clear division of labor between the thylakoids (light-dependent reactions) and the stroma (light-independent reactions).
18 Medium
18 of 194
Remembering +4 | -1
Pigments can be separated from leaf by
View answer and explanation
Correct option: D
Paper chromatography
Option D (Paper chromatography) is correct because paper chromatography is a technique used to separate pigments based on their differential solubility in a solvent.
19 Medium
19 of 194
Analyzing +4 | -1
Assertion: The external factors that affect
photosynthesis are number, size, age and
orientation of leaves, mesophyll cells and
chloroplasts and the amount of chlorophyll.

Reason: The internal factors that affect
photosynthesis are availability of sunlight,
temperature, CO2C{O_2}
concentration and water.
View answer and explanation
Correct option: D
If both Assertion and Reason are false
Option D (If both Assertion and Reason are false) is correct because the assertion incorrectly describes internal factors as external, and the reason incorrectly describes external factors as internal.
20 Medium
20 of 194
Application +4 | -1
When 12 H+12 \, H^+ pass through F0−F1F_0 - F_1 particle, how many ATPs are produced
View answer and explanation
Correct option: A
3 ATP
Option A (3 ATP) is correct because approximately 4 H+ ions are required to produce 1 ATP, so 12 H+ ions would produce 3 ATP.
21 Medium
21 of 194
Analyzing +4 | -1
I. It is the characteristics of C4−{C_4} - plants

II. It is the characteristics of C3−{C_3} - plants

III. It occurs in chloroplast

IV. It occurs in daytime

V. It occurs in night

Select the correct options in relation to photorespiration
View answer and explanation
Correct option: B
Correct option : I, III, IV, Incorrect option : I, V
The correct answer is B (Correct option : I, III, IV, Incorrect option : I, V) because photorespiration is characteristic of C3 plants, occurs in chloroplasts and daytime, and not C4 plants or nighttime.
22 Medium
22 of 194
Analyzing +4 | -1
Assertion (A): Photosynthesis takes place only in green parts.

Reason (R): Green parts of a plant absorb green light, so they become green.
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option C is correct because while photosynthesis primarily occurs in green parts, the reason is that green parts contain chlorophyll, which absorbs red and blue light, not green light.
23 Medium
23 of 194
Analyzing +4 | -1
Assertion : CO2C{O_2}
is transported from mesophyll
cells to bundle sheath of chloroplasts in C4{C_4}
plants.

Reason : RuBP is called initial acceptor of CO2C{O_2} in
C2{C_2}
plants.
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C (If Assertion is true but Reason is false) is correct because CO2 is indeed transported from mesophyll to bundle sheath cells in C4 plants, but RuBP is the initial acceptor of CO2 in C3 plants, not C2 plants.
24 Easy
24 of 194
Understanding +4 | -1
Rubisco enzyme is absent in
View answer and explanation
Correct option: A
Mesophyll cell
Option A (Mesophyll cell) is correct because in C4 plants, RuBisCO is primarily located in the bundle sheath cells, not the mesophyll cells.
25 Medium
25 of 194
Remembering +4 | -1
The components of PS-I are located on the
View answer and explanation
Correct option: D
Outer surface of stromal and granal thylakoid
Option D (Outer surface of stromal and granal thylakoid) is correct because the components of PS-I are located on the outer surface of both stromal and granal thylakoids.
26 Medium
26 of 194
Understanding +4 | -1
Proton gradient is broken down due to
View answer and explanation
Correct option: D
Movement of proton across the membrane to stroma
Option D is correct because the proton gradient is dissipated when protons move from the thylakoid lumen back to the stroma through ATP synthase.
27 Medium
27 of 194
Understanding +4 | -1
Maximum amount of photosynthesis occurs in
View answer and explanation
Correct option: C
Saturation point
Option C (Saturation point) is correct because the saturation point is the point at which increasing a factor (like light intensity or CO2 concentration) no longer increases the rate of photosynthesis, indicating maximum photosynthetic activity.
28 Hard
28 of 194
Understanding +4 | -1
All of the following statements are true for photorespiration, except
View answer and explanation
Correct option: A
It involves three double membrane bound cell organelles
Option A (It involves three double membrane bound cell organelles) is correct because photorespiration involves only two double membrane bound organelles: chloroplasts and mitochondria. Peroxisomes are single membrane bound organelles.
29 Medium
29 of 194
Analyzing +4 | -1
Assertion (A): Chloroplasts have enzyme rich stroma for the conversion of light energy into chemical energy.

Reason (R): Stroma has the enzymes for carbon reduction.
View answer and explanation
Correct option: D
Assertion is false but Reason is true
Option D is correct because the assertion is false (stroma is not for converting light energy) and the reason is true (stroma has carbon reduction enzymes).
30 Medium
30 of 194
Analyzing +4 | -1
As compared to a C3−{C_3} - plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4−{C_4} - plants?
View answer and explanation
Correct option: D
12
The correct answer is D (12) because C4 plants require 2 additional ATP per CO2 fixed compared to C3 plants, and 6 CO2 are needed per hexose.
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