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NEET • BIOLOGY • PHOTOSYNTHESIS IN HIGHER PLANTS

Photosynthesis in higher plants practice · Medium

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1 Medium
1 of 89
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.
2 Medium
2 of 89
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.
3 Medium
3 of 89
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.
4 Medium
4 of 89
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.
5 Medium
5 of 89
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.
6 Medium
6 of 89
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.
7 Medium
7 of 89
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.
8 Medium
8 of 89
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.
9 Medium
9 of 89
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.
10 Medium
10 of 89
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.
11 Medium
11 of 89
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.
12 Medium
12 of 89
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.
13 Medium
13 of 89
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.
14 Medium
14 of 89
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.
15 Medium
15 of 89
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.

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16 Medium
16 of 89
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).
17 Medium
17 of 89
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.
18 Medium
18 of 89
Understanding +4 | -1
Joseph Priestley observed that when mouse alone was placed in a closed bell jar with burning candle, it was suffocated and candle burning extinguished but when mouse was placed with a mint plant in the same bell jar, that mouse stayed alive and candle continued to burn. What he concluded from this experiment?
View answer and explanation
Correct option: C
Both (a) and (b)
Option C is correct because Priestley's experiment showed that burning candles remove air and mint plants restore it, allowing the mouse to survive and the candle to continue burning.
19 Medium
19 of 89
Remembering +4 | -1
Colour that we see in leaves is due to the presence of
I. Chlorophyll-a II. Chlorophyll-b
III. Xanthophyll IV. Carotenoid
View answer and explanation
Correct option: D
I, II, III and IV
Option D (I, II, III and IV) is correct because all the listed pigments (Chlorophyll-a, Chlorophyll-b, Xanthophyll, and Carotenoid) contribute to the color we see in leaves.
20 Medium
20 of 89
Understanding +4 | -1
Read the following statements 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
View answer and explanation
Correct option: C
(iii) only
Option C (iii) only is correct because stroma lamellae membranes possess PS I only, whereas grana lamellae membranes possess both PS I and PS II.
21 Medium
21 of 89
Analyzing +4 | -1
Assertion: Photorespiration is found in all plants.

Reason : In C4{C}_4 plants, first CO2{CO}_2 fixation product is formed in bundle sheath cells.
View answer and explanation
Correct option: D
Both assertion and reason are incorrect
Option D (Both assertion and reason are incorrect) is correct because photorespiration is NOT found in all plants (it's minimized in C4 plants), and the first CO2 fixation product in C4 plants is formed in mesophyll cells, not bundle sheath cells.
22 Medium
22 of 89
Application +4 | -1
With reference to three Calvin cycles, which of the given options is correct for the following question? I. How many gross PGAL molecules are produces? II. Total, how many ATP molecules are required for synthesis of PGAL molecules? II. Total, how many NADPH2_2 molecules are required for the synthesis of obtained PGAL molecules?
View answer and explanation
Correct option: B
I-6 PGAL, II-6 ATP, III-6 NADPH2_2
The correct answer is B (I-6 PGAL, II-6 ATP, III-6 NADPH2_2) because three Calvin cycles produce 6 gross PGAL, requiring 6 ATP and 6 NADPH2_2.
23 Medium
23 of 89
Understanding +4 | -1
For yielding one molecule of glucose, the Calvin cycle turns
View answer and explanation
Correct option: C
Six times
Option C (Six times) is correct because the Calvin cycle needs to turn six times to fix six molecules of CO2CO_2 to produce one molecule of glucose.
24 Medium
24 of 89
Remembering +4 | -1
Photophosphorylation is the
View answer and explanation
Correct option: C
Formation of ATP in the presence of light
Option C (Formation of ATP in the presence of light) is correct because photophosphorylation is the process of ATP synthesis using light energy.
25 Medium
25 of 89
Analyzing +4 | -1
Assertion (A): C4C_4 plants are photosynthetically active than C3{C}_3 plants.

Reason (R): Photorespiration is very high in C4{C}_4 Plants.
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option C (Assertion is true but Reason is false) is correct because C4 plants are indeed more photosynthetically active than C3 plants, but photorespiration is very LOW in C4 plants, not high.
26 Medium
26 of 89
Understanding +4 | -1
The process which makes major difference between C3{C_3} and C4{C_4} plants is
View answer and explanation
Correct option: D
photorespiration
Option D (photorespiration) is correct because the major difference between C3 and C4 plants lies in the presence or absence (or significant reduction) of photorespiration.
27 Medium
27 of 89
Analyzing +4 | -1
In a crop field a weedicide is used to remove weeds in order to increase the yield. But the effect of this weedicide is that, it blocks electron transport from photosystem II to photosystem I. This will result in
View answer and explanation
Correct option: D
Both 2 and 3
Option D (Both 2 and 3) is correct because blocking electron transport from PSII to PSI will inhibit both ATP synthesis and NADPH reduction.
28 Medium
28 of 89
Understanding +4 | -1
What is true for photosynthesis?
View answer and explanation
Correct option: B
Carbon dioxide is reduced and water is oxidised
Option B is correct because during photosynthesis, carbon dioxide is reduced to form glucose, and water is oxidized to release oxygen.
29 Medium
29 of 89
Understanding +4 | -1
Photosynthesis is an important process for life on earth because
View answer and explanation
Correct option: D
All of the above
Option D is correct because photosynthesis is the foundation of the food chain, releases oxygen, and is the primary way sunlight is utilized.
30 Medium
30 of 89
Understanding +4 | -1
I. Tomato

II. Black pepper

III. Mango

From the above option choose the correct answer in
respect of greenhouse crops
View answer and explanation
Correct option: D
I and II
Option D (I and II) is correct because tomato and black pepper are commonly grown as greenhouse crops.
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